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Winter Meeting 2009 Strep uberis Staph aureus Coag neg staphs Subclinical mastitis What is it? What is the cost of subclinical mastitis? How do we control it? New strategy to control it. Current trend in cell counts in New Zealand


  1. Winter Meeting 2009

  2. Strep uberis

  3. Staph aureus

  4. Coag neg staphs

  5. Subclinical mastitis  What is it?  What is the cost of subclinical mastitis?  How do we control it? New strategy to control it.

  6. Current trend in cell counts in New Zealand  This year Fonterra rolling average was 200-300,000!  Increasing-why? Lack of banding incentives 1. Effect of poor repro and growing dairy nos 2.

  7. What is subclinical mastitis  Somatic cell count  Individual and bulk  Cows response to infection-types of infection

  8. Golden Bay 2007-9. n=847. Subclinical only 40 35 30 25 20 Series1 15 10 5 0 CNS Staph aureus Strep uberis No Growth SU/CNS E.coli

  9. Cost of high cell counts and mastitis  Estimates 2% production per 100,000  $20-30/cow moving from 212000 to 150000-achievable  Components of saving: Mainly cost saving through production 1. Approx $200 clinical case 2. Culling 3.

  10. Cost Benefit analysis-production No Cows Prod/cow kg Payout $/kg Total $ Value of 2% 300 320 4.55 436800 $8736

  11. Targets  Subclinical targets- how to measure  BMSCC – what is achievable on your farm?  Individual cell counts – thresholds  Herd tests data 4 needed-limitations of less

  12. Targets for Mastitis CLINICAL Clinical cases over dry period < 2% Clinical cases over calving and first 6 weeks of lactation < 6% Clinical cases per month for rest of lactation < 2% Total percentage of clinical cases over whole lactation < 10%

  13. SUB-CLINICAL Percentage of pickups above 250,000 for the whole season < 2% Individual S.C.C. above 150,000 at any herd test < 15% Average B.S.C.C. for season 200,000 Maximum B.S.C.C. in early lactation 250,000 Maximum B.S.C.C. before dry off 250,000

  14. Change in nos of cows in cell count groups-herd test data Date: Cell count ranges 4th last 3rd last 2nd last latest 0-149 84% 73% 57% 57% 150-249 4% 11% 18% 17% 250-499 5% 9% 11% 14% 500+ 7% 8% 14% 12% Total cows 424 422 415 355 Est Bulk Tank 177 209 331 258

  15. Change in nos of cows in cell count groups- herd test data

  16. Strategy to control subclinical infection  Five point plan;  Targeted culling  Prompt treatment and detection  Teat disinfection  Milking machine maintenance and milking management  Dry cow therapy

  17. Targeted Culling and treatment  Use bacteriology of high cell count cows to improve in this area;  RMT positive at day 5/6  Herd test data

  18. Results  New research has shown value of treating different infections in different circumstances  Strep uberis  CNS  Staph aureus Treatment action relates to prevalence and type of pathogen identified.

  19. Prevalence and rate of new infection  Aim of bacty investigation is to reduce the prevalence and rate of spread of subclinical infection  Rate of spread can be alarming

  20. Cumulative Prevalence (%) of cows yielding Staph aureus .Demonstrates how prevalence can alter strategy by influencing new infection rate. 4 times over 500000 Group 1 Dry off 76 <1 week post calving 35 mean calving + 5mths21/01/2007 82 mean calving + 7 mths17/03/2007 82 Group 2 4 times under 200000 Dry off 0 <1 week post calving 12 mean calving + 5mths21/01/2007 35 mean calving + 7 mths17/03/2007 47

  21. Other management options  Dry off  Separate herds Again following bacteriology

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