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Reduced revenues associated with Johnes disease in U.S. dairy herds: NAHMS Dairy 96 Results

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Based on changes in adjusted revenue on a per cow inventory basis ... Cull cow sales. Cows sold to other producers. Minus cow replacement costs ... – PowerPoint PPT presentation

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Title: Reduced revenues associated with Johnes disease in U.S. dairy herds: NAHMS Dairy 96 Results


1
Reduced 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
2
(No Transcript)
3
Economic 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
4
Adjusted 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
5
Economic impact of herd Johnes status NAHMS
Dairy 96 Study
Steven Ott and Scott Wells USDA and University
of Minnesota
6
Economic impact of herd Johnes status NAHMS
Dairy 96 Study
Steven Ott and Scott Wells USDA and University
of Minnesota
7
Johnes disease cost comparisonsPrices
standardized
Steven Ott and Scott Wells USDA and University
of Minnesota
8
Summary 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
9
Risk factors identified for the control of
Johnes disease by NAHMS Dairy 96 Study
Steven Ott and Scott Wells USDA and University
of Minnesota
10
Hurdles 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
11
Johnes 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 Johnes diseaseNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
13
Johnes disease herd risk factorsNAHMS 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
Johnes disease herd risk factorsNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
16
Percent of operations by use of type of maternity
housing facilitiesNAHMS 1996
Steven Ott and Scott Wells USDA and University
of Minnesota
17
Percent of operations using calving area as
hospital area for sick cowsNAHMS 1996
Steven Ott and Scott Wells USDA and University
of Minnesota
18
Johnes disease herd risk factorsNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
19
Johnes disease herd risk factorsNAHMS 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 Johnes disease herd statusNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
22
111111

23
Comparison of Johnes disease herd status by
familiarity and previous diagnosisNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
24
Comparison of Johnes disease herd status by
familiarity and previous diagnosisNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
25
Comparison of Johnes disease herd status by
familiarity and previous diagnosisNAHMS Dairy 96
Study
Steven Ott and Scott Wells USDA and University
of Minnesota
26
Steven Ott and Scott Wells USDA and University
of Minnesota
27
  • Questions

Steven Ott and Scott Wells USDA and University
of Minnesota
28
(No Transcript)
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