investigating herd mastitis problems dave wolfgang bhushan jayarao ernest hovingh department of...
Post on 24-Jan-2016
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Investigating Herd Mastitis Problems
Dave WolfgangBhushan JayaraoErnest Hovingh
Department of Veterinary & Biomedical Sciences
Penn State University
Dave WolfgangBhushan JayaraoErnest Hovingh
Department of Veterinary & Biomedical Sciences
Penn State University
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The planThe planThe planThe plan Defining the problemDefining the problem
Who?Who? When?When? What?What? Why?Why? Where?Where?
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““Over-the-phone” questioningOver-the-phone” questioning““Over-the-phone” questioningOver-the-phone” questioning Herd descriptionHerd description
SizeSize HousingHousing Milking facilitiesMilking facilities
Herd veterinarian(s)?Herd veterinarian(s)?
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What is the problem - from the producer’s What is the problem - from the producer’s point of view?point of view? High bulk tank SCC?? High bulk tank SCC??
How high?How high? Too many cases of clinical mastitis?Too many cases of clinical mastitis?
How many?How many? Cows dying due to mastitis?Cows dying due to mastitis?
How many?How many?
““Over-the-phone” questioningOver-the-phone” questioning““Over-the-phone” questioningOver-the-phone” questioning
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What records/information do you have What records/information do you have available?available? DHI individual cow SCC?DHI individual cow SCC? Clinical mastitis / treatment records?Clinical mastitis / treatment records? Culture results?Culture results? Milking equipment analysis?Milking equipment analysis?
What has been done to date? By whom?What has been done to date? By whom? Vet, equipment dealer, pharmaceutical Vet, equipment dealer, pharmaceutical
company rep, consultants, etc.company rep, consultants, etc.
““Over-the-phone” questioningOver-the-phone” questioning““Over-the-phone” questioningOver-the-phone” questioning
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Can I get...Can I get...Can I get...Can I get... ...your DHI herdcode & RAC?...your DHI herdcode & RAC?
...a copy of any other records & information ...a copy of any other records & information (clinical mastitis/treatment records, etc.)?(clinical mastitis/treatment records, etc.)?
...your vet’s (and other relevant peoples’) ...your vet’s (and other relevant peoples’) contact information?contact information?
...you to send in some bulk tank samples?...you to send in some bulk tank samples?
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DHI Records AnalysisDHI Records AnalysisDHI Records AnalysisDHI Records Analysis Regarding SCC...Regarding SCC...
Cows with >200,000 somatic cells/ml – high Cows with >200,000 somatic cells/ml – high probability of being infectedprobability of being infected200,000 = LS 4200,000 = LS 4
SCC of cows that have been successfully SCC of cows that have been successfully treated should return to <200,000 within ~1 to treated should return to <200,000 within ~1 to 4(+?) weeks4(+?) weeks
Not all high SCC will show up as clinical Not all high SCC will show up as clinical mastitismastitis
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DHI Records AnalysisDHI Records AnalysisDHI Records AnalysisDHI Records Analysis Summary informationSummary information
eg. DHI 802eg. DHI 802
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““Goals”Goals” Linear Score <5.0Linear Score <5.0 Linear Score >7.0Linear Score >7.0
11stst lactation lactation > 90%> 90% < 2%< 2%
22ndnd lactation lactation > 85%> 85% < 4%< 4%
33rd+rd+ lactation lactation >80%>80% < 5%< 5%
Whole herdWhole herd > 85%> 85% < 4%< 4%
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How ‘clean’ are the heifers “on average” entering the herd?
What is “on average” the change in SCS
over the dry period?
How many animals is this an average of?
Are these the same animals?
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DHI Records AnalysisDHI Records AnalysisDHI Records AnalysisDHI Records Analysis On-line course developed by PSU On-line course developed by PSU
(http://onlinelearning.psu.edu/DHIA/)(http://onlinelearning.psu.edu/DHIA/)
SCC spreadsheet being developed by SCC spreadsheet being developed by Dave Baver & Rob GoodlingDave Baver & Rob Goodling
Individual cow SCCIndividual cow SCC
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DHI Records AnalysisDHI Records AnalysisDHI Records AnalysisDHI Records Analysis
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Records analysisRecords analysisRecords analysisRecords analysis Clinical mastitis cases per monthClinical mastitis cases per month
““Goal”: <3 cases per 100 cows per monthGoal”: <3 cases per 100 cows per month Records are usually of ‘tenuous quality’Records are usually of ‘tenuous quality’ Obviously depends on ‘case definition!’Obviously depends on ‘case definition!’
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Records analysisRecords analysisRecords analysisRecords analysis Treatment/therapy & ‘cure’ recordsTreatment/therapy & ‘cure’ records
Non-existent on most farms, or unreliableNon-existent on most farms, or unreliable
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Records analysisRecords analysisRecords analysisRecords analysis Use/analysis of records prior to a herd visit Use/analysis of records prior to a herd visit
will:will: More clearly identify the problemMore clearly identify the problem Help guide the farm investigationHelp guide the farm investigation Make it look as if you know what you’re doing Make it look as if you know what you’re doing
