Title: Reduced revenues associated with Johnes disease in U.S. dairy herds: NAHMS Dairy 96 Results
1Reduced Revenues and Risk Factors Associated with
Johnes in Dairy Herds NAHMS
Steven Ott DVM Scott J Wells DVM CEAH
USDA-APHIS-VS
Materials reviewed by National Johne's Working
Group / Johne's Disease Committee / USAHA 2003
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3Economic impact of Johnes diseaseNAHMS 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
Johnes disease, change in cow inventory
Steven Ott and Scott Wells USDA and University
of Minnesota
4Adjusted revenueNAHMS 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
5Economic impact of herd Johnes status NAHMS
Dairy 96 Study
Steven Ott and Scott Wells USDA and University
of Minnesota
6Economic impact of herd Johnes status NAHMS
Dairy 96 Study
Steven Ott and Scott Wells USDA and University
of Minnesota
7Johnes disease cost comparisonsPrices
standardized
Steven Ott and Scott Wells USDA and University
of Minnesota
8Summary of Johnes economic impact
- Economic impact is a function of Johnes herd
status and percent of cull cows with clinical
signs of Johnes 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
9Risk factors identified for the control of
Johnes disease by NAHMS Dairy 96 Study
Steven Ott and Scott Wells USDA and University
of Minnesota
10Hurdles to overcome in control of Johnes 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
11Johnes 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
12Risk factors for Johnes diseaseNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
13Johnes disease herd risk factorsNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
14Percent of dairy operations that introduced
cattle in previous year NAHMS 1996
Steven Ott and Scott Wells USDA and University
of Minnesota
15Johnes disease herd risk factorsNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
16Percent of operations by use of type of maternity
housing facilitiesNAHMS 1996
Steven Ott and Scott Wells USDA and University
of Minnesota
17Percent of operations using calving area as
hospital area for sick cowsNAHMS 1996
Steven Ott and Scott Wells USDA and University
of Minnesota
18Johnes disease herd risk factorsNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
19Johnes disease herd risk factorsNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
20Collins et al, www.johnes.org
Steven Ott and Scott Wells USDA and University
of Minnesota
21Comparison of familiarity and previous diagnosis
with Johnes disease herd statusNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
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23Comparison of Johnes disease herd status by
familiarity and previous diagnosisNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
24Comparison of Johnes disease herd status by
familiarity and previous diagnosisNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
25Comparison of Johnes disease herd status by
familiarity and previous diagnosisNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
26Steven Ott and Scott Wells USDA and University
of Minnesota
27Steven Ott and Scott Wells USDA and University
of Minnesota
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