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    Consumer assessment of beef palatability from four beef muscles from

    USDA Choice and Select graded carcasses

    M.R. Hunt, A.J. Garmyn, T.G. O'Quinn, C.H. Corbin, J.F. Legako, R.J. Rathmann, J.C. Brooks, M.F. Miller

    Department of Animal and Food Sciences, Texas Tech University, Lubbock, TX, 79409, USA

    a b s t r a c ta r t i c l e i n f o

    Article history:

    Received 20 December 2013

    Received in revised form 25 March 2014Accepted 10 April 2014

    Available online 23 April 2014

    Keywords:

    Acceptability

    Consumer

    Flavor

    Muscle characterization

    Quality grade

    Tenderness

    Consumer sensory analysis was conducted to determine differences in beef palatability between two quality

    grade categories [Upper 2/3 (Top) Choice and Select] and four muscles [longissimus lumborum (LL), gluteus

    medius (GM), serratus ventralis (SV), and semimembranosus (SM)]. Generally, tenderness, avor, and overall

    liking scores were more desirable for Top Choice compared to Select, regardless of muscle. Consumers rated LL

    as more tender (Pb 0.05) than SV and SM, but similar to GM ( P= 0.52). Overall and avor acceptability were

    similar (PN 0.05) between LL, GM, and SV, regardless of quality grade. Consumer overall liking was most highly

    correlated with avor liking (r= 0.85). When tenderness was acceptable,avor and juiciness played a major

    role in determining overall acceptability. Overall liking of GM and SV from Top Choice carcasses was superior

    to LL from Select carcasses and comparable to LL from Top Choice carcasses.

    2014 Elsevier Ltd. All rights reserved.

    1. Introduction

    Beefavor is undoubtedly related to consumer satisfaction. Accord-

    ing to Umberger, Feuz,Calkins, and Killinger (2000), consumerscan dis-

    tinguish a avor difference between strip steaks from two varying

    marbling levels and are willingto pay premiums for thetypeof beefa-

    vorthey prefer. O'Quinnet al. (2012)showedthat fat content associated

    with USDA quality grade, which is based upon the visual appraisal of

    marbling and carcass maturity, had a large effect on beef avor of

    longissimus lumborum steaks, with beefavor contributing greatly to

    overall palatability. A distinct linear decline in avor rating was ob-

    served as quality grade decreased from Prime to Standard. USDA

    Prime represents the highest quality grade within young Amaturity

    carcasses, while USDA Standard, the lowest. Although all palatability

    traits were related to overall liking, consumer ratings for avor had

    the highest correlation to overall liking (O'Quinn et al., 2012). Previous

    work has shown that avor becomes the most important aspect of beef

    eating satisfaction when tenderness is acceptable (Behrends et al.,

    2005a, 2005b; Goodson et al., 2002; Killinger, Calkins, Umberger, Feuz,

    & Eskridge, 2004). Moreover, several studies collectively showed that

    consumer overall acceptability ratings were more highly correlated

    with avor ratings than tenderness or juiciness ratings, regardless

    of tenderness variation (Neely et al., 1998; O'Quinn et al., 2012;

    Thompson, 2004).Given these results, research wasneeded to determineif similar beef

    avor trends would be observed in muscles other than the longissimus

    lumborum. We believe that higher intramuscular fat (IMF) content of

    beef cuts considered intermediate in tenderness or tough will increase

    consumeravor ratings and consequently overall palatability. Until re-

    cently, the chuck has traditionally been marketed as low-priced roasts

    (Kukowski, Maddock, Wulf, Fausti, & Taylor, 2005). Following muscle

    proling work of the beef chuck and round, the wholesale value of the

    chuck has increased, thus enhancing the overall value of a beef carcass

    (Von Seggern, Calking, Johnson, Brickler, & Gwartney, 2005). Moreover,

    the top sirloin has been associated with inconsistencies in palatability,

    particularly in tenderness (Harris, Miller, Savell, Cross, & Ringer, 1992;

    Neely et al., 1998). If overall eating satisfaction of chuck, sirloin, and

    round cuts from high quality carcasses is comparable to loin cuts from

    lower quality carcasses, additional value could be captured by market-

    ing muscles with intermediate tenderness, which are currently

    underutilized in high quality carcasses. Moreover, viable steak alterna-

    tives for foodservice establishments may be discovered. Thus, this re-

    search explored ways to capitalize on the inherent quality variation of

    the beef population to add value. Therefore, the rst objective of this

    study was to measure the effects of quality grade on the palatability

    traits ofavor, tenderness, juiciness, and overall liking of beef strip

    loin steaks [Institutional Meat Purchase Specications (IMPS) #180],

    under blade (Denver cut) steaks (IMPS #116E), top sirloin butt steaks

    (IMPS # 184), and top round steaks (IMPS #169) (NAMP, 2010) as

    Meat Science 98 (2014) 18

    This study was funded by the Beef Checkoff.

    Corresponding author. Tel.: +1 806 742 2805; fax: +1 806 742 4003.

    E-mail address:[email protected](A.J. Garmyn).

    http://dx.doi.org/10.1016/j.meatsci.2014.04.004

    0309-1740/ 2014 Elsevier Ltd. All rights reserved.

    Contents lists available atScienceDirect

    Meat Science

    j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / m e a t s c i

    http://dx.doi.org/10.1016/j.meatsci.2014.04.004http://dx.doi.org/10.1016/j.meatsci.2014.04.004http://dx.doi.org/10.1016/j.meatsci.2014.04.004mailto:[email protected]://dx.doi.org/10.1016/j.meatsci.2014.04.004http://www.sciencedirect.com/science/journal/03091740http://www.sciencedirect.com/science/journal/03091740http://dx.doi.org/10.1016/j.meatsci.2014.04.004mailto:[email protected]://dx.doi.org/10.1016/j.meatsci.2014.04.004http://crossmark.crossref.org/dialog/?doi=10.1016/j.meatsci.2014.04.004&domain=pdf
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    determined by consumers, with emphasis on the role of IMFon beefa-

    vor and overall palatability. The second objective was to determine if

    higherIMF percentages associated with these quality grades could com-

    pensate for reduced tenderness in steaks from underutilized muscles in

    the chuck, sirloin, and round by improving overall liking through in-

    creasedavor.

    2. Materials and methods

    2.1. Product collection and sample preparation

    The study was arranged as a 2 4 factorial representing two quality

    grade categories [Upper 2/3 (Top) Choice (marbling scores from

    modest50 to moderate50) and Select (marbling scores from slight00 to

    slight100)] and four muscles [longissimus lumborum (LL), gluteus

    medius (GM), serratus ventralis (SV), and semimembranosus (SM)].

    Sides (n= 40) of beef (20 per quality grade category) ( USDA, 1997)

    were selected from a commercial beef processing facility. Carcasses

    were selected and veried by trained Texas Tech University personnel

    through visual appraisal of marbling and maturity of the product at

    the time of selection. The strip loin (IMPS #180;NAMP, 2010), top sir-

    loin butt (IMPS #184;NAMP, 2010), and the top round (IMPS #169;

    NAMP, 2010) from each of the selected sides were identied and col-

    lected. The chuck eye roll was removed from the chuck roll leaving

    only the under blade (IMPS #116E;NAMP, 2010) or serratus ventralis

    which was fabricated at the plant by trained personnel. All muscles

    were transported by refrigerated truck to theGordon W. Davis Meat Sci-

    ence Laboratory in Lubbock, Texas. Subprimals were stored in vacuum

    bags at 2 to 4 C in the absence of light until 21 days postmortem.

    Following 21 days postmortem aging, each muscle was trimmed to

    remove all visible or external connective tissue and exterior fat. In addi-

    tion, the gluteus medius was removed from the strip loin. The biceps

    femoris, gluteus accessories, and gluteus profundus were removed

    from the top sirloin butt. The gracilis, adductor, pectineus, and sartorius

    muscles were removed from the top round. The resulting muscles were

    fabricated into 2.5 cm-thick steaks. A steak from each subprimal was

    designated for proximate analysis, WarnerBratzler shear force

    (WBSF), and fatty acid analysis in a rotational order throughout themuscle to eliminate any bias. All remaining 2.5-cm steaks were por-

    tioned into smaller piecesmeasuring approximately5 cm 5 cm.Steaks

    for proximate analysis, WBSF, fatty acid analysis and consumer testing

    were packaged, andfrozen (10 C) until sorting. Once frozenthe sam-

    ples were sorted into a predetermined balanced cook order. Cooking

    groups (n = 48) of 10 steakpieces from each treatment were packaged

    and stored in the absenceof lightat10 C until consumer evaluations.

    2.2. Proximate analysis and pH

    Proximate analyses were performed to determine the percentage of

    IMF, collagen, moisture, and protein. Frozen samples were thawed at 2

    5 C for 24 h prior to analysis. Each sample wasnely ground through a

    commercial food grinder (Krups 150 Watt Meat Grinder item #402-70,Krups, Shelton, CT) to obtain a 200-g sample. Samples were analyzed

    using an AOAC-approved (AOAC, 2005) near infrared spectrophotome-

    ter (FOSS FoodScan 78800; Dedicated Analytical Solutions, Hilleroed,

    Denmark). Independent readings (n = 15) were taken from each

    sample and averaged for the nal reported values. At grinding, a 10-g

    sample was reserved for analysis of pH using the methods described

    byLuque et al. (2011).

    2.3. WarnerBratzler shear force evaluation

    Shear force of each steak was determined by using a WBSF analyzer

    (G-R Elec. Mfg., Manhattan, KS). Steakswere thawed for 1824h until a

    2 to 5 C internal temperature was reached. Steaks were cooked on a

    model S-143K Silex clamshell grill (Silex Grills Australia PTY. Ltd.,

    Marrickville, Australia), preheated to 225 C. The grill was allowed to

    preheat for 45 min prior to cooking; each steak was cooked to an inter-

    nal temperature of 71 C. Steaks were then cooled for 24 h at 2 C. Six

    1.3-cm cores were removed (unless steak size limited number of

    cores) parallel to the muscle ber from each steak and sheared once

    perpendicular to the muscle bers. The values from the six cores from

    each steak were averaged to determine the overall shear force value

    for the steak for statistical analysis.

    2.4. Consumeravor preparation and panels

    The Texas Tech University Institutional Review Board approved

    procedures for use of human subjects for consumer panel evaluation

    of sensory attributes.

    Samples were thawed at 2 to 4 C for 24 h prior to consumer evalu-

    ation. All samples were cooked on a model S-143K Silex clamshell grill,

    preheated to 225 C. The grill was preheated 45 min prior to cooking

    and 10 steak pieces (unrelated to the trial) were cooked to condition

    the grill and ensure stable temperatures throughout all heating ele-

    ments (Gee, 2006). An exact time schedule was followed to ensure all

    steaks were prepared identically and facilitate continued consistency

    of the heating elements. Sets of 10 steak pieces were prepared at one

    time on the grill, for an allotted 5 min. After cooking, steak pieces

    were held for 3 min before serving. Each steak piece was cut into two,

    equally-sized portions and served to two predetermined consumer

    panelists.

    Consumer panels were conducted in the Texas Tech University Ani-

    mal and Food Science Building. Consumer panelists (n= 120) were re-

    cruited from Lubbock, Texas and the surrounding communities and

    were prescreened for a minimum of consuming beef at least once in a

    two week period. Panelists were monetarily compensated for their par-

    ticipation, and were allowed to participate only once. Each session

    consisted of 20 consumers per panel and lasted approximately 75 min.

    Attributes for each sample were rated on a paper ballot with 100-

    mm continuous line scales for tenderness, juiciness, liking ofavor,

    and overall liking. The zero anchors were labeled as not tender, not

    juicy, and dislike extremely ofavor and overall. Conversely, the 100

    anchors were labeled as very tender, very juicy, and like extremely ofavor and overall. In addition, each consumer was asked to rate each

    trait as acceptable or unacceptable. Consumers were also requested to

    rate each sample as unsatisfactory, good everyday quality, better than

    everyday quality, or premium quality. Consumers were served a total

    of eight samples. Each consumer received all treatments according to

    a predetermined rotational order. The steak rotation was balanced

    acrossall 20 consumers so that each treatment waseatenan equal num-

    ber of times across all eight sampling positions. The panel was conduct-

    ed in a large room with tables divided into individual booths. Each

    panelist was assigned a number. Panelists were provided with a ballot,

    plastic utensils, toothpicks, a napkin, an expectorant cup, a cup of

    water,as well as diluted apple juice (10%v/v),and crackersto use aspal-

    ate cleansers between samples.

    2.5. Statistical methods

    Consumerdata were analyzed as a completeblock designwitha 2

    4 factorial arrangement. Muscle and quality grade served as xed

    effects, and consumer was included in the model as a random vari-

    able. The MIXED procedure of SAS (SAS Inst. Inc., Cary, NC) was

    used to analyze the effect of quality grade and muscle on consumer

    responses, proximate analysis, and WBSF. Acceptability and satisfac-

    tion data were analyzed using the GLIMMIX procedure of SAS, with

    the ILINK option of the LSMEANS statement of SAS used to calculate

    least squares means for the proportions. Treatment least squares

    means were separated with the PDIFF option of SAS at a signicance

    level ofPb0.05. The CORR procedure of SAS was used to determine

    the relationship between consumer responses and proximate data,

    2 M.R. Hunt et al. / Meat Science 98 (2014) 18

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    and WBSFacross allsamplesand by muscle at a signicance level ofP

    b0.05.

    3. Results and discussion

    3.1. Consumer demographics

    Consumer preferences in Lubbock, Texas have reportedly beensimilar to preferences of beef consumers in other major metropoli-

    tan areas throughout the country such as, Los Angeles, CA; Chicago,

    IL; and Washington D.C. (Miller, Carr, Ramsey, Crockett, & Hoover,

    2001). The demographic prole of the consumers that participated

    in this study is presented inTable 1. Slightly more males participated

    in the study than females. This varies slightly from the national aver-

    age as reported by the 2012 Statistical Abstract ( U.S. Census Bureau,

    2012) with 49.2% of the population being male and 50.8% being fe-

    male. The ages of the consumers were distributed from 18 to 65

    with the 1825 group having the most participants (33.1%). More-

    over, the 2635 age group had the least number of participants

    with only 10.2%. The majority of the consumers were Caucasian,

    which is about 10% higher than the national average (79.6%;U.S.

    Census Bureau, 2012). Each annual household income bracket was

    represented by the consumers tested, but the largest number of par-

    ticipants (29.1%) represented the $70,000100,000 range. The edu-

    cation level was higher than that of the US population with 58%

    being college graduates or post graduates.

    3.2. Consumer purchasing habits

    Thebeef purchasing habits of the consumerswho participated in the

    sensory study are presented inTable 2. Nearly 80% of the consumers

    statedthey were theregular purchaserof beef forthe family. When buy-

    ing steaks or roasts, 51.3% of the consumers stated they normally pur-

    chase USDA Choice, followed by 12.6% Sterling Silver, 6.7% USDA

    Select, and 5% USDA Prime and Certied Angus Beef. When consuming

    steaks and roasts, participants indicated the most important trait wastenderness (57% and 70%, respectively). Flavor ranked second when

    consuming steaks at 35%. Moreover, 94% of participants said they have

    an excellent eating experience almost alwaysor some of the time

    when eating beef.

    3.3. Proximate analysis and pH

    Table 3 illustrates the relationships of muscle and quality grade with

    proximate components of raw muscle samples. Muscle and quality

    grade inuenced (Pb 0.01) percent IMF, collagen, and protein, while

    an interaction was observed (P= 0.04) between muscle and quality

    grade for the percentage of moisture. SV had greater IMF and collagen

    percentages than any other muscle and, consequently, the least

    percentage protein. The percent of IMF in the muscles from the loin

    (LL and GM) was intermediate, while the SM had lower IMF percentage

    than any other muscle. In alignment with the current results, similar

    trends in moisture and IMF have been observed between muscles by

    McKeith, De Vol, Miles, Bechtel, & Carr (1985)andVon Seggern et al.

    (2005). Collagen percentage was less than 2% in the GM, LL, and SM;

    however, the percent in LL was similar (P= 0.61) to GM and SM. Con-

    versely, protein percentage wasgreatest in SM and LL, although theper-

    cent of protein found in GM did not differ (P= 0.12) from LL. Top

    Choice had a greater (Pb 0.01) percent of IMF and collagen as well as

    a lower (Pb 0.01) percentage of protein regardless of muscle. Within

    each muscle, the proportion of moisture was reduced as quality grade

    increased from Select to Top Choice. The Top Choice SV had less mois-

    ture than any other treatment combination, while the Select SM and

    LL had the greatest proportion of moisture. Within each quality grade,

    SV generally had the least percentage moisture with SM containingthe greatest.

    Although pH for all samples was within acceptable ranges (b5.8), SV

    had pH values greater (P b0.01) than all other muscles (Table 3).

    Table 1

    Demographic characteristics of consumers (n = 120) who participated in consumer

    sensory panels.

    Characteristic Response % of consumers

    Sex Male 52.59

    Female 47.41

    Household size 1 Person 14.172 People 22.50

    3 People 14.17

    4 People 30.00

    5 People 10.00

    6 People 7.05

    N6 People 1.67

    Household income Single income 40

    Dual income 60

    Age 1825 33.05

    2635 10.17

    3645 20.34

    4655 24.58

    5665 11.86

    Ethnic origin AfricanAmerican 0.01

    Caucasian/White 88.98

    Native American 1.69

    Hispanic 0.85Asian 6.78

    Other 1.69

    Annual household income, US $ b20,000 10.26

    20,000 to 29,999 5.13

    30,000 to 49,999 17.09

    50,000 to 69,999 11.11

    70,000 to 100,000 29.06

    N100,000 27.35

    Highest level of education

    completed

    Non-high school graduate 1.67

    High school graduat e 12.50

    Some college/technical school 27.50

    College graduate 42.50

    Post graduate 15.83

    Weekly beef consumption None 6.67

    1 to 3 times 44.17

    4 to 6 times 35.83

    7 or more times 13.33

    Table 2

    Beef purchasing habits of consumers (n = 120) who participated in consumer sensory

    panels.

    Characteristic Response % of consumers

    Consumer is a regular

    purchaser of beef in family

    Yes 78.33

    No 21.67

    Quality of steaks or roasts

    normally purchased

    USDA Prime 5.04

    USDA Choice 51.26

    USDA Select 6.72

    Certi

    ed Angus Beef 5.04Store Brand 1.68

    Sterling Silver 12.61

    Chef's Exclusive 1.68

    F or eman's Choice 1.68

    N olan Ryan's Beef 0.00

    S teak House brand 0.84

    Do not know 13.45

    Most important palatability

    trait when consuming beef roasts

    Flavor 21.01

    Tenderness 69.75

    Juiciness 9.24

    Most important palatability trait

    when consuming beef steaks

    Flavor 35.29

    Tenderness 57.14

    Juiciness 7.56

    How often the consumer has an

    excellent eating experience

    Almost always 51.67

    Some of the time 42.50

    Almost never 5.00

    Never 0.83

    3M.R. Hunt et al. / Meat Science 98 (2014) 18

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    McKenna et al. (2005) reported pH of several muscles during simulated

    retail display, including the four evaluated in the current study. Much

    like the present results, SV had a greater pH than LL, SM, or GM, and

    minimal differences in pH values were observed during the display pe-

    riod. Likewise,Von Seggern et al. (2005)reported similar trends for pH

    values between muscles as the present results.

    3.4. WarnerBratzler shear force

    The relationshipsbetween muscle and quality grade with WBSF and

    cooking loss are depicted inTable 4. No interactions were observed (P

    N 0.05) for either trait. Least squares means for all muscles were

    below 45.1 N, which is often cited as the critical value where consumers

    begin to rate LL steaks as toughas opposed to tender(Miller et al.,

    2001; Shackelford, Morgan, Cross, & Savell, 1991). Regardless, SM had

    greater (Pb 0.05) WBSF values than any other muscle except the GM.

    Although SV had the least numerical WBSF value, LL and SV required

    similar force to shear (PN 0.05), which is supported byJohnson et al.

    (1988)andPaterson and Parrish (1986). Regardless of muscle, USDA

    Select steaks had greater (P b0.01) WBSF values compared to Top

    Choice. Cooking loss was not impacted by muscle or quality grade ( P

    N0.05).McKeith, De Vol, Miles, Bechtel, and Carr (1985) and Rhee,Wheeler, Shackelford, and Koohmaraie (2004)reported similar rank-

    ings of shear valueswhen evaluating WBSF of variousmusclesincluding

    LL, GM, and SM; however, SV was not included in either study. More-

    over, WBSF values reported byRhee et al. (2004)were greater than

    those in the current study; however, steaks were aged until 14 days

    postmortem (as opposed to 21 days in the current study), which may

    explain a portion of the variation. When characterizing the muscles of

    the round,Von Seggern et al. (2005)classied the GM with a WBSF

    value N47.96 N, but the SM had an intermediate classication (37.76

    N b WBSF N47.96 N), which conicts with the current ndings as

    both values were greater than the current study. Again, this may be

    due to the shorter postmortem aging period of 14 days implemented

    byVon Seggern et al. (2005). Their classication of the SV, however,

    as a muscle with WBSFb37.76 N alignswith the present results. In con-trast to the current ndings,Nelson, Dolezal, Ray, and Morgan (2004)

    reported an interaction for WBSF between quality grade and muscle.

    Three of which are included in this study (LL, GM, and SM). In their

    study, Top Choice (Certied Angus Beef) had greater WBSF values in

    the LL and GM, but not in SM, when compared to Select. Steaks were

    aged 14 days in Nelson's study and 21 days in the present study; how-

    ever, the GM had greater shear values than the SM regardless of quality

    grade, which again contradicts the current results.

    In support of thecurrentndings, Smith et al.(1985) reported steaks

    from carcasses with higher marbling scores had lower shear force

    values than steaks with lower marbling scores. Likewise, Lorenzen

    et al. (2003)reported that USDA Select had higher shear values than

    USDA Choice. Additional research has shown that as the quality grade

    of beef cuts increased, WBSF values decreased, suggesting marbling

    has a positive effect on objective measurements of meat tenderness

    (Garmyn et al., 2011; Gruber et al., 2006; Nelson et al., 2004).

    3.5. Tenderness

    Consumer ratings for all tenderness scores are shown in Table 5.

    Tenderness scores were more desirable (P b 0.01) for Top Choice

    (63.79) compared to Select (52.54), regardless of muscle. Consumers

    rated LL (68.06) as more tender (P b0.01) than SV (63.28) and SM

    (34.72), but similar to GM (66.59; PN0.05). Consumers scored the ten-derness of SM far lower (Pb 0.05) than any other muscle, which aligns

    with the greater shear force values. However, a more distinct separation

    was observed in consumer tenderness scores than WBSF between SM

    and the other muscles.

    Previous consumer studies involving muscles from the chuck often

    compare those muscles to the longissimus muscle from the wholesale

    rib (LT), creating challenges when comparing to the current study.

    Kukowski et al.(2005)observed similar results to ourswhenconsumers

    evaluated USDA Choice LT and SV, where LT tenderness scores were

    more desirable than those for SV. Similarly, Kukowski, Maddock, and

    Wulf (2004) reported greater consumer tenderness scores for USDASe-

    lect LT compared to SV. However, consumershave also rated tenderness

    similarly between USDA Choice LT and SV (Kukowski et al., 2004).

    Trends from the Beef Customer Satisfaction study align with the currentresults in terms of consumer ratings for tenderness of top loin, top sir-

    loin, and top round (Neely et al., 1998). Ranking of overall tenderness

    Table 3

    The effects of muscle and quality grade1 on the least square means for percentage chemical intramuscular fat (IMF), protein, moisture, collagen and pH of raw samples (n = 106).

    Trait Gluteus medius

    (n= 36)

    Longissimus lumborum

    (n= 12)

    Semimembranosus

    (n= 18)

    Serratus ventralis

    (n= 40)

    SEM2 P-value3

    Select Top Choice Select Top Choice Select Top Choice Select Top Choice Muscle QG M QG

    IMF, % 3.82y 6.35y 2.95y 6.85y 1.61z 3.41z 7.48x 11.90x 0.88 b0.01 b0.01 0.11

    Protein, % 22.93b 22.56b 23.36ab 22.81ab 23.41a 22.97a 20.76c 19.92c 0.19 b0.01 b0.01 0.47

    Moisture, % 70.92b 68.82d 71.94ab 68.55d 72.46a 70.96b 69.92c 66.26e 0.63 b0.01 b0.01 0.04

    Collagen, % 1.85z 2.11z 1.90z 1.98z 1.71z 1.82z 2.15y 2.44y 0.09 b0.01 b0.01 0.40

    pH 5.50z 5.47z 5.61y 5.55y 5.62y 5.55y 5.78x 5.78x 0.03 b0.01 0.09 0.72

    1Quality grade: Select (marbling score: slight00 to slight100) or Top Choice (marbling score: modest50 to moderate50).2Pooled (largest) SE of LS means.3Observed signicance levels for main effects of muscle (M), quality grade (QG), and the muscle quality grade interaction.adWithin a row, least squares means without a common superscript differ (Pb 0.05) due to muscle quality grade interaction.xyzWithin a row, least squares means without a common superscript differ (Pb 0.05) due to muscle.

    Table 4

    The effects of muscle and quality grade1 on the least square means for WarnerBratzler shear force (WBSF) and cooking loss (n= 106).

    Trait Gluteus medius

    (n = 36)

    Longissimus lumborum

    (n= 12)

    Semimembranosus

    (n= 18)

    Serratus ventralis

    (n = 40)

    SEM2 P-value3

    Select Top Choice Select Top Choice Select Top Choice Select Top Choice Muscle QG M QG

    WBSF,N 31.48xy 30.79xy 32.07yz 24.42yz 34.23x 33.15x 27.85z 22.56z 1.77 b0.01 b0.01 0.11

    Cooking loss, % 25.50 22.74 22.62 22.37 22.78 21.44 23.12 23.54 1.42 0.51 0.36 0.56

    1Quality grade: Select (marbling score: slight00 to slight100) or Top Choice (marbling score: modest50 to moderate50).2Pooled (largest) SE of LS means.3Observed signicance levels for main effects of muscle (M), quality grade (QG), and the muscle quality grade interaction.xyz

    Within a row, least squares means without a common superscript differ (Pb

    0.05) due to muscle.

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    of LL, GM, and SM by trained sensory assessors also aligns with the

    present ndings (McKeith et al., 1985; Rhee et al., 2004).

    3.6. Juiciness

    Unlike tenderness, an interaction was observed (P 0.02) between

    muscle and quality grade for consumer ratings of juiciness, avor

    liking, and overall liking (Table 5). Top Choice SV had more desirable

    (P= 0.02) consumer scores for juiciness than any other muscle

    quality grade combination, followed by Select SV. The SV had the

    greatest pH of all muscles, as well as the greatest IMF percentage,

    which could have played a role in consumer juiciness ratings.

    Semimembranosus Top Choice and Select steaks had the least desirable

    juiciness scores, but did not differ (PN 0.05) between the two grades.

    Kukowski et al. (2004)observed similar results to ours when con-

    sumers evaluated USDA Choice and Select LT and SV, where SV juiciness

    scores were greater than those for LT. However, consumers assigned

    greater juiciness scores to USDA Choice LT than SV in a separate study

    (Kukowski et al., 2005). In the Beef Customer Satisfaction study (Neely

    et al., 1998), consumers scored top loin juicier than top sirloin, which

    was in turn was juicier than top round based on in-home steak evalua-

    tions. In the current study, however, LL and GM received greater juici-

    ness scores than SM, but loin cuts did not differ within their respectivequality grades when cooking method was controlled. Discrepancies

    could be partially explained by different cooking methods, which

    McKenna et al. (2004)reported can affect consumer ratings for juici-

    ness. Results from trained evaluations of juiciness vary from the current

    ndings as well as previous consumer work.Rhee et al. (2004)did not

    observe any differences in juiciness between LL, GM, and SM; however,

    McKeith et al. (1985)reported greater juiciness scores for LL compared

    to SM and GM, which had similar scores for juiciness.

    3.7. Flavor and overall liking

    For all muscles except SM, consumer scores for avor liking and

    overall liking were more desirable for Top Choice compared to

    Select (Table 5). Consumer scores for avor liking and overall liking

    showed similar trendsas consumers rated Top Choice LL and GM higher

    (P 0.02) than the remaining muscle quality grade combinations;

    however, Top Choice SV was similar to Top Choice GM for avor and

    overall liking.

    When consumers evaluated USDA Choice SV and LT, they found SV

    had more intense avor and SV were more liked, but no differences

    were observed between USDA Select SV and LT for avor intensity or

    overall liking (Kukowski et al., 2004). In the current study, consumers

    rated avor and overall liking similarly for LL, GM, and SV within Select.

    Within Top Choice, however, LL received greater scores than SV for

    avor and overall liking.Neely et al. (1998)reported more desirable

    overall liking scores for Top Choice top loin and top round compared

    to Select, but consumers showedno preference forhigher quality grades

    of top sirloin butt. Aside from top loin, these results do not fully agree

    with the current ndings. Moreover, those consumers (Neely et al.,

    1998) preferred top loin over top sirloin regardless of quality grade, as

    indicated by more desirable overall liking scores, which conicts with

    the current results as Top Choice LL and GM had similarscores for over-

    all liking.

    3.8. Consumer acceptability scores

    As seen inTable 6, both muscle and quality grade inuenced (P

    0.05) the percentage of samples rated as acceptable for tenderness,

    juiciness,avor liking, and overall liking. The SM showed the lowest

    (Pb 0.01) percentage of acceptability for all palatability traits. For ten-

    derness, LL and GM had the greatest proportion of acceptable samples,

    while SV was intermediate. According to consumers, SV and GM had

    the greatest percentage of samples with acceptable juiciness, followed

    by LL, which was intermediate to SM. The percentage of samples that

    were rated acceptable for avor and overall liking was similar (P

    N0.05) for GM, SV, and LL. A decrease(P 0.05) in theproportionof ac-

    ceptable samples for each palatability trait was observed as quality

    grade decreased from Top Choice to Select.

    Table 5

    The effects of muscle and quality grade1 on the least square means for consumer (n = 120) sensory scores1 for palatability traits.

    Trait Gluteus medius

    (n= 36)

    Longissimus lumborum

    (n = 12)

    Semimembranosus (n

    =18)

    Serratus ventralis

    (n= 40)

    SEM2 P-value3

    Select Top Choice Select Top Choice Select Top Choice Select Top Choice Muscle QG M QG

    Tenderness 62.01xy 71.17xy 60.36x 75.77x 31.83z 37.60z 56.45y 70.60y 2.15 b0.01 b0.01 0.07

    Juiciness 57.57d 67.02c 58.45d 70.51bc 48.96e 48.99e 73.21b 82.24a 1.99 b0.01 b0.01 b0.01

    Flavor 59.22c 68.78ab 57.17cd 72.07a 50.00e 52.46de 60.22c 66.78b 2.03 b0.01 b0.01 b0.01

    Overall liking 59.28c 68.67ab 54.53c 73.95a 42.50d 46.61d 58.05c 68.10b 2.38 b0.01 b0.01 b0.01

    1Quality grade: Select (marbling score: slight00 to slight100) or Top Choice (marbling score: modest50 to moderate50).2Pooled (largest) SE of LS means.3Observed signicance levels for main effects of muscle (M), quality grade (QG), and the muscle quality grade interaction.aeWithin a row, least squares means without a common superscript differ (Pb 0.05) due to muscle quality grade interaction.xyzWithin a row, least squares means without a common superscript differ (Pb 0.05) due to muscle.

    Table 6

    The effects of muscle and quality grade1 on the percentage of samples rated as acceptable by consumers (n= 120) for tenderness, juiciness, avor liking, and overall liking.

    Trait Gluteus medius

    (n = 36)

    Longissimus

    lumborum (n = 12)

    Semimembranosus

    (n = 18)

    Serratus ventralis

    (n = 40)

    SEM2 P-value3

    Select Top Choice Select Top Choice Select Top Choice Select Top Choice Muscle QG M QG

    Ten derness 90.61x 96.15x 88.19x 95.37x 49.91z 60.30z 77.41y 91.41y 3.66 b0.01 b0.01 0.41

    Juiciness 91.66x 95.34x 84.47y 90.65y 73.20z 78.50z 95.34x 97.41x 3.34 b0.01 0.03 0.91

    Flavor 90.78y 95.48y 89.18y 93.93y 81.79z 83.45z 89.18y 91.58y 2.68 b0.01 0.05 0.69

    Overall liking 85.17y 94.75y 83.52y 93.20y 67.33z 73.39z 90.83y 90.83y 3.37 b0.01 b0.01 0.17

    1Quality grade: Select (marbling score: slight00 to slight100) or Top Choice (marbling score: modest50 to moderate50).2Pooled (largest) SE of LS means.3Observed signicance levels for main effects of muscle (M), quality grade (QG), and the muscle quality grade interaction.xyz

    Within a row, least squares means without a common superscript differ (Pb

    0.05) due to muscle.

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    3.9. Consumer perceived quality levels

    Consumer perceived quality levels are presented inTable 7. Muscle

    and quality grade interacted (P 0.03) to inuence the percentage of

    samples considered unsatisfactoryand good everyday quality.Top

    Choice GM and LL were considered unsatisfactory less often than

    any other muscle quality grade combination, while SM were rated

    as unsatisfactory more often than all other muscles. Numerically, con-

    sumers considered Top Choice SVgood everyday qualityless often

    than other muscle quality grade combinations, but this percentage

    was similar to Top Choice LL (P N0.05). GM, LL, and SV were rated

    as better than everyday qualityand premium qualitymore often

    (Pb0.05) than SM, regardless of quality grade. A greater percentage

    (Pb 0.01) of Top Choice steaks were considered better than everyday

    qualityand premium qualitycompared to Select.

    3.10. Correlations

    To estimate the extent to which palatability scores and objective

    measures inuenced overall liking, correlations between palatability

    traits, compositional data, and WBSF were determined (Table 8).

    Consumer overall liking was correlated (P b0.01) with consumer

    tenderness (r= 0.75) and juiciness ratings (r= 0. 68), butmost highly

    correlated with avor liking (r= 0.86). Overall liking, tenderness, juic-

    iness, and avor were negatively related (P b0.01) to WBSF (r

    0.29). Each of the proximate components was related (Pb 0.01) to

    overall liking. As the percentage of IMF increased, overall liking in-

    creased, while moisture and protein were inversely related to overall

    liking. With all muscles combined, WBSF and proximate components

    were associated (P b0.05) with overall liking, but the relationships

    were relatively weak.Neely et al. (1998)showed strong, positive rela-

    tionships between overall liking with tenderness, juiciness, and avor

    desirability of top loin, top sirloin butt, and top round. O'Quinn et al.

    (2012)found that fat content had an effect on beefavor of the LL,

    and the importanceof beefavor was clearly linked to overall palatabil-

    ity. The correlations between palatability traits and overall liking were

    similar with those reported byO'Quinn et al. (2012).

    Pearson correlations between palatability traits, compositional data,

    and WBSF for GM,LL, SM, andSV, respectively, are presented in Tables 9

    to12. Coefcients for tenderness, juiciness,avor liking, and overall lik-

    ing of LL closely resemble those for all muscles; however, the relation-

    ships between overall liking, WBSF, and proximate components were

    stronger. Coefcients for tenderness, juiciness, avor liking, and overall

    liking of SM indicated weaker relationships than for all muscles. The re-

    lationships between overall liking, WBSF, and proximate components

    Table 7

    The effects of muscle and quality grade1 on the percentage of samples rated at different perceived quality levels by consumers ( n= 120).

    Quality level Gluteus medius Longissimus

    lumborum

    Semimembranosus Serratus ventralis SEM2 P-value3

    Select Top Choice Select Top Choice Select Top Choice Select Top Choice Muscle QG M QG

    Unsatisfactory 15.01c 3.74d 19.06bc 4.52d 37.96a 28.41ab 15.72c 14.08c 4.82 b0.01 b0.01 0.03

    Good everyday quality 50.43ab 39.88bc 52.54a 32.31cd 52.54a 55.92a 50.01ab 26.43d 4.72 b0.01 b0.01 0.01

    Better than everyday quality 26.77y 37.42y 19.03y 36.58y 6.58z 12.38z 24.03y 34.07y 4.51 b0.01 b0.01 0.73

    Premium quality 6.66y 18.22y 8.26y 25.73y 2.47z 2.47z 9.09y 24.06y 3.97 b0.01 b0.01 0.53

    1Quality grade: Select (marbling score: slight00 to slight100) or Top Choice (marbling score: modest50 to moderate50).2Pooled (largest) SE of LS means.3Observed signicance levels for main effects of muscle (M), quality grade (QG), and the muscle quality grade interaction.adWithin a row, least squares means without a common superscript differ (Pb 0.05) due to muscle quality grade interaction.yzWithin a row, least squares means without a common superscript differ (Pb 0.05) due to muscle.

    Table 8

    Pearson's correlation coefcients for the relationships between consumer sensory scores, proximate data, and WarnerBratzler shear force data a.

    Overall liking Tenderness Juiciness Flavor WBSF %IMF %Collagen %Moisture

    Tenderness 0.75

    Juiciness 0.68 0.60

    Flavor 0.86 0.59 0.58

    WBSF 0.22 0.21 0.29 0.20

    %Intramuscular fat (IMF) 0.31 0.35 0.41 0.25 0.52

    %Collagen 0.25 0.28 0.34 0.20 0.33 0.79

    %Moisture 0.33 0.35 0.37 0.26 0.49 0.95 0.72

    %Protein 0.19 0.20 0.38 0.15 0.48 0.87 0.69 0.72

    a

    All correlation coefcients were signicant (Pb 0.01).

    Table 9

    Pearson's correlation coefcients for the relationships between consumer sensory scores, proximate data, and WarnerBratzler shear force data for the gluteus medius.

    Overall liking Tenderness Juiciness Flavor WBSF %IMF %Collagen %Moisture

    Tenderness 0.72a

    Juiciness 0.73a 0.62a

    Flavor 0.88a 0.62a 0.65a

    WBSF 0.02 0.01 0.03 0.07

    %Intramuscular fat (IMF) 0.24a 0.26a 0.25a 0.21a 0.01

    %Collagen 0.18a 0.08 0.19a 0.15b 0.15b 0.53a

    %Moisture 0.21a 0.23a 0.21a 0.19a 0.09 0.93a 0.45a

    %Protein 0.15b 0.18a 0.20a 0.16b 0.36a 0.53a 0.14b 0.38a

    a Correlation coefcients were signicant (Pb 0.01).b

    Correlation coef

    cients were signi

    cant (P b

    0.05).

    6 M.R. Hunt et al. / Meat Science 98 (2014) 18

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    were not signicant for SM. Overall liking was not correlated

    with (PN 0.05) WBSF for GM; however, the remaining coefcients

    indicated similar relationships to those of all muscles. For SV, avor

    liking (r= 0.87) was highly correlated with overall liking, but tender-

    ness (r= 0.65) and juiciness (r= 0.56) showed weaker relationships

    to overall liking than observed with other muscles.

    4. Conclusions

    All three palatability traits played a major role in determining

    overall acceptability as indicated by high correlation coefcients for

    each trait. Even when consumers scored tenderness low, as with

    the SM, superior avor and juiciness could compensate to improve

    the overall liking and acceptability of beef. Overall liking of SV and

    GM from higher quality carcasses was superior to LL from lower

    qualitycarcasses and comparable to LL fromhigher quality carcasses.

    The SV Top Choice was most desirable for juiciness compared to all

    other muscle quality grade treatments, perhaps due to higher pH

    values increasing water-holding capacity within the SV and greater

    IMF of SV than any other muscle. Overall, results showed that mar-

    keting the GM and SV from Top Choice carcasses on the basis of com-

    parable overall consumer acceptability to Top Choice LL could add

    additional value to the carcass.

    References

    AOAC (2005).Ofcial methods of analysis Assoc. Off. Anal. Chem., Arlington, VA (18th ed.).Behrends, J. M., Goodson, K. J., Koohmaraie, M., Shackelford, S. D., Wheeler, T. L., Morgan,

    W. W., Reagan, J. O., Gwartney, B.L., Wise, J. W., & Savell, J. W. (2005a). Beef customersatisfaction: Factors affecting consumer evaluations of calcium chloride-injected topsirloin steaks when given instructions for preparation.Journal of Animal Science,83,28692875.

    Behrends, J. M., Goodson, K. J., Koohmaraie, M., Shackelford, S. D., Wheeler, T. L., Morgan,W. W.,Reagan, J. O., Gwartney, B.L., Wise, J. W., & Savell, J. W. (2005b). Beef customersatisfaction: USDA quality grade and marination effects on consumer evaluations of

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    MSA [Meat Standards Australia] pathway trials. North Sydney: Meat and LivestockAustralia.

    Goodson, K. J., Morgan, W. W., Reagan, J. O., Gwartney, B.L., Courington, S. M., Wise, J. W.,& Savell, J. W. (2002).Beef customer satisfaction: Factors affecting consumer evalua-tions of clod steaks. Journal of Animal Science,80, 401408.

    Gruber, S. L., Tatum, J.D., Scanga, J. A., Chapman, P. L., Smith, G. C., & Belk, K. E. (2006). Ef-fects of postmortem aging and USDA quality grade on WarnerBratzler shear forcevaluesof seventeenindividual beef muscles.Journalof AnimalScience, 84, 33873396.

    Harris, J. J., Miller, R. K., Savell, J. W., Cross, H. R., & Ringer, L. J. (1992). Evaluation of thetenderness of beef top sirloin steaks. Journal of Food Science,57(69), 15.

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    Table 10

    Pearson's correlation coefcients for the relationships between consumer sensory scores, proximate data, and WarnerBratzler shear force data for the longissimusa.

    Overall liking Tenderness Juiciness Flavor WBSF %IMF %Collagen %Moisture

    Tenderness 0.78

    Juiciness 0.73 0.64

    Flavor 0.87 0.62 0.63

    WBSF 0.34 0.22 0.28 0.30

    %Intramuscular fat (IMF) 0.42 0.32 0.29 0.37 0.72

    %Collagen 0.26 0.25 0.20 0.23 0.27 0.32

    %Moisture 0.41 0.30 0.27 0.37 0.71 0.98 0.17%Protein 0.30 0.22 0.26 0.29 0.79 0.73 0.41 0.67

    a All correlation coefcients were signicant (Pb 0.01).

    Table 11

    Pearson's correlation coefcients for the relationships between consumer sensory scores, proximate data, and WarnerBratzler shear force data for the semimembranosus.

    Overall liking Tenderness Juiciness Flavor WBSF %IMF %Collagen %Moisture

    Tenderness 0.70a

    Juiciness 0.64a 0.43a

    Flavor 0.80a 0.51a 0.54a

    WBSF 0.05 0.15b 0.01 0.03

    %Intramuscular fat (IMF) 0.02 0.04 0.05 0.01 0.04

    %Collagen 0.03 0.09 0.03 0.06 0.25a 0.68a

    %Moisture 0.02 0.01 0.02 0.01 0.20a 0.93a 0.47a

    %Protein 0.04 0.04 0.02 0.02 0.32a 0.71a 0.51a 0.59a

    a Correlation coefcients were signicant (Pb 0.01).b

    Correlation coefcients were signicant (Pb 0.05).

    Table 12

    Pearson's correlation coefcients for the relationships between consumer sensory scores, proximate data, and WarnerBratzler shear force data for the Serratus ventralis.

    Overall liking Tenderness Juiciness Flavor WBSF %IMF %Collagen %Moisture

    Tenderness 0.65a

    Juiciness 0.56a 0.55a

    Flavor 0.87a 0.50a 0.47a

    WBSF 0.16b 0.18a 0.27a 0.17a

    %Intramuscular fat (IMF) 0.26a 0.25a 0.24a 0.20a 0.47a

    %Collagen 0.15b 0.14b 0.16b 0.12 0.23a 0.76a

    %Moisture 0.26a 0.25a 0.24a 0.20a 0.43a 0.98a 0.78a

    %Protein 0.23a 0.19a 0.21a 0.17a 0.54a 0.90a 0.55a 0.83a

    a Correlation coefcients were signicant (Pb 0.01).b

    Correlation coef

    cients were signi

    cant (Pb

    0.05).

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