Consequence of changing standards for somatic cell count on US Dairy Herd Improvement herds
description
Transcript of Consequence of changing standards for somatic cell count on US Dairy Herd Improvement herds
H. D. Norman*, J. R. Wright, R. H. MillerAnimal Improvement Programs LaboratoryAgricultural Research Service, USDA Beltsville, MD [email protected]
ADSA – 2011 (1)
Consequence of changing standards for somatic cell count on US Dairy Herd Improvement herds Abstr. 352
NormanADSA– 2011 (2)
U.S. milk quality measures Bulk tank somatic cell count (BT-SCC)
Monitored by USDA Data from 4 of 10 Federal Milk Orders
(FMO) Accounts for nearly 50% of U.S. milk
supply
Herd test-day somatic cell count (TD-SCC) Herds in DHI Accounts for 94% of U.S. DHI herds
NormanADSA– 2011 (3)
98 99 00 01 02 03 04 05 06 07 08 09 10200
225
250
275
300
325
350
318311 316 322 320 319
295 296288
276262
233 228
Year
SCC
(100
0s)
U.S. DHI TD SCC (all breeds)
NormanADSA– 2011 (4)
BT-SCC limits
Country
SCC limit(cells/mL)
Australia 400KE.U. 400KNew Zealand
400K
Norway 400KSwitzerland 400KCanada 500KU.S. 750K
CA, ID, OR LESS
NMPFproposed SCC limits
Date Cells/mL1-1-2012 600K1-1-2013 500K1-1-2014 400K
NormanADSA– 2011 (5)
U.S. versus E.U. SCC monitoring
Individual farmIndividual farmSCC sample
4 consecutive3-month means over limit
3 of 5 consecutive samples over limit
Producer suspension
Geometric mean of 3 monthly BT-SCC
Consecutive monthly BT-SCC
Value used
400K cells/mL750K cells/mLBT-SCC limit
E.U.U.S.Program characteristic
NormanADSA– 2011 (6)
Export concerns E.U. change in SCC sampling point from
bulk truck or plant silo to individual farm 3-month mean (E.U.) used as single
reference for period, which allows more time to reduce future SCC
Geometric mean (E.U.) mathematically lower than arithmetic mean (U.S.) and requires recalculation
NormanADSA– 2011 (7)
SCC noncompliance comparison
Current E.U. and U.S. SCC standards as well as 3 NMPF proposed standards Percentage of herds Percentage of milk supply
Examined by month and herd size
NormanADSA– 2011 (8)
Data SCS converted to SCC for 14,854 DHI herds
Herd requirements 15–26 tests (Jan. 2009 – Oct. 2010) ≥10 cows for all test days
Herd TD-SCC used as proxy for BT-SCC Each cow SCC weighted by her TD milk
yield
NormanADSA– 2011 (9)
SCC herd noncompliance – month
Jun 09
Jul 09
Aug 09
Sep 09
Oct 09
Nov 09
Dec 09
Jan 10
Feb 10
Mar 10
Apr 10
May 10
Jun 10
Jul 10
Aug 10
Sep 10
Oct 10
0
2
4
6
8
10
12
14
16
18Proposed U.S. (400K)Current E.U. (400K)Proposed U.S. (500K)Proposed U.S. (600K)Current U.S. (750K)
Date
Herd
non
com
plia
nce,
%
NormanADSA– 2011 (10)
SCC milk noncompliance – month
Jun 09
Jul 09
Aug 09
Sep 09
Oct 09
Nov 09
Dec 09
Jan 10
Feb 10
Mar 10
Apr 10
May 10
Jun 10
Jul 10
Aug 10
Sep 10
Oct 10
0
2
4
6
8
10
12
14
16
18
Current U.S. (750K)Proposed U.S. (600K)Proposed U.S. (500K)Proposed U.S. (400K)Current E.U. (400K)
Date
Milk
non
com
plia
nce,
%
NormanADSA– 2011 (11)
SCC noncompliance – means*
NoncomplianceSCC standard Herd, % Milk, %750K, current U.S. 0.9 0.2600K, proposed U.S. 2.7 0.7500K, proposed U.S. 6.2 2.0400K, proposed U.S. 14.1 5.8400K, current E.U. 7.8 3.1
*November 2009 – October 2010
NormanADSA– 2011 (12)
SCC herd noncompliance – herd size
1–49 50–99 100–149 150–199 200–299 300–499 500–999 1,000+02468
101214161820
Proposed U.S. (400K)Current E.U. (400K)Proposed U.S. (500K)Proposed U.S. (600K)Current U.S. (750K)
Cows in herd
Herd
com
plia
nce,
%
NormanADSA– 2011 (13)
Conclusions E.U. changes in SCC enforcement led to
reconsideration of stricter U.S. standards If 400K U.S. SCC limits were used,
noncompliance would be higher than if current E.U. standard was applied
For U.S. producers to meet stricter SCC standards, sound management and culling for milk quality need to be emphasized
NormanADSA– 2011 (14)
Opinion There has been a surprisingly large
decline in SCC in the U.S. and we believe it’s because of the required payment for quality (on SCC) in 4 FMO plus other voluntary incentives in the other markets.
We hope that whatever regulations are enacted in the future will not disrupt the success of the SCC incentives that seems to be working.