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Michigan Johne's Disease Control Demonstration Project
Dairy Herd 1
Characteristics
Risk Assessment
Testing Results
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Characteristics
CATEGORY |
CHARACTERISTICS |
Breed |
Holstein |
Housing |
Confinement free stall,
heifers and dry cows graze in summer. |
Feeding System |
TMR |
Expanding? |
No |
Raise own replacements |
Yes |
Open or closed herd |
Closed |
# Lactating cows |
2003: 141
2004: 153
2005: 165
2006: 176 |
Breeding Program |
Ov-Synch / Artificial Insemination |
Rolling Herd Average |
2003: 31,309 lbs
2004: 29,558 lbs
2005: 32,967 lbs
2006: 34,016 lbs
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Calving |
Prior to 2003 - individual calving pens, but Johne's disease suspects use the same calving area as other cows, and minor manure build-up poses risk for Johne's disease transmission
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Colostrum feeding |
Prior to 2003 - colostrum
from multiple cows pooled and fed to calves, especially if
heifers freshen.
New protocol 2003 - Only feed colostrum from cows that have tested Johne's disease negative, and do not pool colostrum. |
Waste milk feeding |
Not done. |
Management of cattle that test positive for Johne's disease |
Johne's disease test positive cows identified with wire tie through current ear tag or a separate distinct ear tag.
Culling of Johne's disease test positive cows when milk production drops to level below break-even, or excessive decline in body condition is evident.
Culling of cows with high Johne's disease ELISA test positive value and positive fecal culture (high risk test positives).
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Risk Assessment 
When this herd began the Michigan Johne's Disease Control Demonstration Project it was classified as being at moderate risk for continued Johne's disease transmission for the following reasons:
- Occasional clinical cases in raised animals, generally older
- Clinical cases are 2 to 5% of herd/year /average over past several years
Major Risk Areas and Preventative Actions
Johne's
Disease Transmission Risk |
What's been
done to decrease risk |
Long-term goal |
Individual calving pens, but Johne's disease suspects use the same calving area as other cows, and minor manure build-up |
New management procedure 2003 - rotate
pens,clean pens more frequently, spread lime in pens between
calvings. |
Build separate area calving area for Johne's disease suspects. |
Prior to 2003 - pre-weaned calves fed
pooled colostrum |
Only feed colostrum from cows that have tested Johne's disease negative, and do not pool colostrum.
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Weaned calves housed in same barn as freshening cows. |
Not addressed |
Build seperate calving area for Johne's disease suspects. |
| Bred heifers and dry cows share fence line in summer. |
Separation of fence lines and water supply for bred heifers and dry cows. |
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Testing Results
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