1. Materials reviewed by National Johne's Working Group / Johne's Disease Committee / USAHA 2003 Reduced Revenues and Risk Factors Associated with Johne’s in Dairy Herds NAHMS Steven Ott DVM Scott J Wells DVM CEAH USDA-APHIS-VS

3. Economic impact of Johne’s disease NAHMS Dairy 96 Study Use of herd-level management data Based on changes in adjusted revenue on a per cow inventory basis Adjust for herd size, region, DHIA, intensive grazing, bST use, bulk tank SCC, days dry, % Holstein, registered herd, familiarity with Johne’s disease, change in cow inventory Steven Ott and Scott Wells USDA and University of Minnesota

4. Adjusted revenue NAHMS Dairy 96 Study Gross revenue –Value of milk production –Value of calves at birth –Cull cow sales –Cows sold to other producers Minus cow replacement costs Steven Ott and Scott Wells USDA and University of Minnesota

5. Economic impact of herd Johne’s status NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

6. Economic impact of herd Johne’s status NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

7. Johne’s disease cost comparisons Prices standardized Steven Ott and Scott Wells USDA and University of Minnesota

8. Summary of Johne’s economic impact Economic impact is a function of Johne’s herd status and percent of cull cows with clinical signs of Johne’s disease Costs are not trivial; $245 per cow compared to returns of $243 per cow over cash expenses for middle 50% of U.S. dairy producers (USDA-ERS) Steven Ott and Scott Wells USDA and University of Minnesota

9. Risk factors identified for the control of Johne’s disease by NAHMS Dairy ’96 Study Steven Ott and Scott Wells USDA and University of Minnesota

10. Hurdles to overcome in control of Johne’s disease Long incubation period Delayed detection and low test sensitivity Lack of familiarity by producers Poorly defined economic losses Lack of consistent control programs Regulatory and ethical problems with testing Steven Ott and Scott Wells USDA and University of Minnesota

11. Johne’s disease control measures 1. Screen purchased cattle to avoid introduction of infection 2. Identify infected cattle and remove from herd to prevent further transmission 3. Prevent calves from ingesting organism (from manure, milk, or colostrum) 4. Decrease contamination of environment to decrease exposure to organism Steven Ott and Scott Wells USDA and University of Minnesota

12. Risk factors for Johne’s disease NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

13. Johne’s disease herd risk factors NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

14. Percent of dairy operations that introduced cattle in previous year NAHMS 1996 Steven Ott and Scott Wells USDA and University of Minnesota

15. Johne’s disease herd risk factors NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

16. Percent of operations by use of type of maternity housing facilities NAHMS 1996 Steven Ott and Scott Wells USDA and University of Minnesota

17. Percent of operations using calving area as hospital area for sick cows NAHMS 1996 Steven Ott and Scott Wells USDA and University of Minnesota

18. Johne’s disease herd risk factors NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

19. Johne’s disease herd risk factors NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

20. Collins et al, www.johnes.org Steven Ott and Scott Wells USDA and University of Minnesota

21. Comparison of familiarity and previous diagnosis with Johne’s disease herd status NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

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23. Comparison of Johne’s disease herd status by familiarity and previous diagnosis NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

24. Comparison of Johne’s disease herd status by familiarity and previous diagnosis NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

25. Comparison of Johne’s disease herd status by familiarity and previous diagnosis NAHMS Dairy 96 Study Steven Ott and Scott Wells USDA and University of Minnesota

27. Questions Steven Ott and Scott Wells USDA and University of Minnesota