Decreasing PRRS Impacts on your farm

William L. Hollis, DVMCarthage Veterinary Service

Carthage, ILhollis@hogvet.com

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Why is PRRS both OLD and NEW• Outline– It is bad– There are things you can do– You have to plan ahead– Action is better than Reaction– Future direction

• Summary

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A Big Thank You ……

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SHMP - System Analysis

The PRRS Reporting Group26 systemsOver 428 sow herdsOver 1.9M sows Approx. 30% of the industry

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HOW to apply the SHMP Results

Carthage System– Location controls (Area spread)

Client herd system 30,000 sows– Within herd management (TTS and Controls)

Client herd individual herd 3000 BTW– Herd level immunity (Monitoring)

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PRRS…are we speaking the same language?

• Stages based on BTW Herd and Piglets• 1 = ACTIVE• 2 = Stable positive (2v = with vaccine)• 3 = Introducing naïve gilts• 4 = Confirmed naïve population

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PRRS…are we speaking the same language?

• RFLP Cut Pattern – what’s in a name?• 252……MLV vaccine like• 184…..used to be the bad boy• 174…..angry new kid on the block

• Honest answer is both “Virus Swarm” a mix of immune response and virus– Multiple PRRS virus changes over time– Multiple levels of immune status (gilts, sows, piglets)

PRRS virus cut patterns 2001 to 2010

SHMP-4/24/15

PRRS virus cut patterns 2011 to 2014

SHMP-5/22/15

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In comes the Angry New Kid

SHMP-4/24/15

The “Virus Swarm” created by a dynamic population

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UMN Sequences over time

SHMP-5/22/15

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PRRS 174• Strain first started wreaking havoc

approximately 1 year ago• Strain appears to evolved from the 1-8-4

family of PRRS viruses• Causes severe clinical signs in most infected

herds including elevated sow mortally, reproductive disease and pre-weaning mortality

SHMP-4/24/15

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PRRS 174

• Decrease performance including up to 50% mortality observed in growing pigs

• Detected in sow herds that are solidly vaccinated and or have immunity from recent infection with other PRRS strains up to 70% pregnancy loss reported

• Virus is certainly explosive when introduced

SHMP-4/24/15

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PRRS 174

• Concern that time to achieve stability is longer than expected and there may be a higher recurrence rate in sow herds previously thought to be “stable”

• Response to interventions has been varied

SHMP-4/24/15

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More Acronyms

TTBP = Time to Baseline ProductionTTS = Time to Stability (negative pigs)

SHMP 6/26/2015

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Can we shorten TTS

SHMP 6/26/2015

Logical duration before stability must include complete duration of gestation …

at least 20 weeks to farrow piglet born to mothers after stability is achieved

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PRRS – What To Do

• What creates the dynamic population?– Gilt introduction– Piglet fostering– Needle pokes– Piglet handling– Water troughs…..

The Virus Swarm

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PRRS – What To Do

• Limit the virus desire to create the “Swarm”

– What we can control• Gilt introductions• Piglet movement•Monitor progress

– Create actions based on stages

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Production Controls

• AASV Website for Stages and Control

• www.aasv.org

AASV 2015 Lowe

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Production Controls

• Changes allowed when at to stage 2

AASV 2015 Lowe

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Plan Ahead – “What we can Control”

• DAY 1 PRRS ACTIVE– STOP piglet movement– Cull aggressively to make space for gilts? – Prepare to LOAD and CLOSE to new gilts– Euthanize severe ill piglets

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Plan Ahead – “What we can Control”• Vaccination with Modified Live PRRS vaccine– Gilts naïve to begin with– Gilts two doses 30 days apart– Sow herd annual immunity

• (Remember Oct 15th happens every year!)

SHMP 01/08/16

EWMA = exponentially weighted moving average = new breaks

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Correlation is NOT Causation• However……Much greater reporting of vaccine use

and 2v control programs in place

SHMP 01/08/16

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Client System impact 22,000 sows

• 7 sow herds in Iowa all become POSITIVE– Virus Introduction = Biosecurity Actions– Virus Control = Production Actions

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Biosecurity Audit

• People• Transport• Mortality Management• Supplies and Entry items• Maintenance

Then all the uncontrollable like …AIR….

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Client System strategy for Control• Vaccine– Herd Stability– Gilt Stability– Piglet control

• LVI – WHERE anticipated “Swarm”• Management practice– STOP piglet movement– Plan for a “Wean Down”

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Vaccine

• Sow herd immunity– Mass vaccination with focus on winter– No needle change

• Gilts 2x - 30 days apart in development– Arrive naïve in off site finishers

• Piglets– When you are in stage 1 consider piglets too

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LVI…..no more….

• Live Virus Inoculation…only used in initial– After vaccine or in vaccinated herd–Dr Linhares 2014 : creates higher piglet losses– Faster TTS but comes at a cost

• Oral or Injection• Gilts vs Sows

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Management Practice• STOP pig movement immediately• No movement even at birth• Needle change every litter• Boot change into newborns• Clean hallway when pigs moved• Washing rooms change clothes• Staff allocation to newborns

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Management PracticeWean Down……WHAT?

• Only consider:1. Clean healthy older pigs need moved out2. PRRS negative pigs at birth – to clean up half

• Euthanize poor pigs prior to processing• Must PREPARE WTM

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Management Practice

• Euthanize poor pigs prior to 10 days age• “Wean Down”– When 90% of litters have 10+ pigs at 10 days age– When a natural gap in the farrowing flow occurs– Wean all pigs 14 days and older– Clean up large portion of farrowing

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Management Impact

Jan. 2014 Jan. 2015 Jan. 2016

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Management Impact

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Management Impact

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Management Impact

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Herd 1 Herd 2 Herd 3 Herd 4 Herd 5

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All Herds: Last 30 months

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Herd 1 Herd 2 Herd 3 Herd 4 Herd 5 Herd 6 Herd 7

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System Impact

PED 40K pigs

PRRS 20K pigs

Blue = Monthly production Red = Quarterly production Green = Difference

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Jul-13

Aug Sep Oct Nov Dec Jan-14

Feb Mar Apr May

Jun Jul-14

Aug Sep Oct Nov Dec Jan-15

Feb Mar Apr May

Jun Jul-15

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Other PRRS Metrics – Past 12 Months• Farrow Rate

1 2 3 4 5 6 7 8 9 10 11 1260

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FARROW RATE Herd 1 Herd 2 Herd 3 Herd 4 Herd 5 Herd 6 Herd 7

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• %STILLBORN

Other PRRS Metrics – Past 12 Months

• %PW MORTALITY1 2 3 4 5 6 7 8 9 10 11 12

02468

1012141618

% STILLBORN Herd 1 Herd 2 Herd 3 Herd 4 Herd 5 Herd 6 Herd 7

1 2 3 4 5 6 7 8 9 10 11 125

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% PW MORTALITY Herd 1 Herd 2 Herd 3 Herd 4 Herd 5 Herd 6 Herd 7

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What COUNTS• Pigs Weaned per Sow Farrowed

1 2 3 4 5 6 7 8 9 10 11 127

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Pigs Wn/Sow Frw Herd 1 Herd 2 Herd 3 Herd 4 Herd 5 Herd 6 Herd 7

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What did we do?• Naïve gilts as feeder pigs• 2X MLV 30 days apart with 4 months off-site• Changed piglet management behavior• Changed site sanitation behavior• Continued investment in biosecurity• 4x per year sow herd MLV focus on winter• Sow herd targeted medication

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What about PRRS Impact on WTM?

• Of course PRRS is harder on WTM than PEDV

With PRRS….Clean up of farrowing is the BEST and FIRST solution to better pigs for WTM

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Lessons for Future Control• Increase piglet monitoring– When setting management practices– STOP moving pigs when it is bad– Create ACTION PLAN for your herd

• PRRS Piglet vaccine in lactation– When you anticipate activity

• Establish a gilt action plan– Both for Stage 1 to 2 back if needed

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Decreasing PRRS on YOUR FARM• Plan Ahead– Area risk : consider MLV vaccination

• If you get it MAKE CHANGE– No pig movements during lactation– Stop transmission handling and equipment– Consider farrowing clean up - wean down

• Reduce the “Virus Swarm”– Gilts 2x MLV 30 days apart – Sows Mass Immunity– Piglets clean up and then Vxn.

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A Big Thank You ……

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THANK YOU