|
Free Stall Barn at Dairy Herd 2
Herd Characteristics
CATEGORY |
CHARACTERISTICS |
Breed |
Holstein |
Housing |
Confinement only, sand bedded free stalls |
Feeding System |
TMR |
Expanding? |
No |
Raise own replacements |
Currently yes.
Last purchased animals were -
6 in 1999 from unknown Johne's disease risk herd, and 10 in
2000 from herd with low Johne's disease risk.
|
Open or closed herd |
Closed since 2000 |
# Lactating cows |
2003: 120
2006: 80 |
Breeding Program |
AI and clean-up bull |
Rolling Herd Average |
2003: 25,400 lbs
2004: 24,800 lbs
2005: 23,000 lbs |
Calving |
One maternity pen that may
occasionally have more than one cow, cleaned once per month,
calves are typically removed from cow within 2 h. of calving |
Colostrum feeding |
Prior to 2003 -colostrum from
multiple cows pooled and fed to all calves.
New protocol 2003 - only feed colostrum from cows that have tested Johne's disease negative a minimum of 2 times. |
Waste milk feeding |
Prior to 2003 - all calves
fed pooled waste milk, no milk replacer used, bottles and
buckets cleaned and sanitized.
New protocol 2003 - waste milk feeding to replacement heifer
calves discontinued, but waste milk from Johne's disease negative
cows still fed to bull calves when available. |
Management of cattle that test positive for Johne's disease |
Johne's disease test positive cows identified with two notches in ear tag, not rebred, and culled at end of lactation or at first sign of clinical disease.
Animals born to JD test positive cows marked with a blue eartag with a "J" on it (see below). |
Back to top
Risk Assessment
When this herd began the Michigan Johne's Disease Control Demonstration Project it was classified as being moderate to high risk for continued Johne's disease transmission for the following reasons:
Calf with JD test positive dam
- Occasional clinical cases in raised
animals, generally older cows
- Clinical cases average 2 to 5% ofherd/year over past several
years
- Number of cases increasing, and/or cases are younger in age
- Management history includes some risks for spread in the past
Cow from Dairy Herd 2
Major Risk Areas and Preventative Actions
Johne's
Disease Transmission Risk |
What's been
done to decrease risk |
Long-term goal |
Prior to 2003 - one maternity pen that occaisonally had more than one cow, cleaned every tenth calving |
Not yet addressed. |
1.) Clean calving area between cows, JD
suspects not allowed to calve in maternity area.
2.) Design and build a new maternity area. |
Prior to 2003 - pre-weaned calves fed pooled
colostrum |
New protocol 2003 - Only feed colostrum
from cows that have tested negative for Johne's disease a
minimum of 2 times.
Colostrum not pooled.
|
|
Prior to 2003 - pre-weaned calves fed pooled
waste milk, no milk replacer used |
New protocol 2003 - waste milk feeding
to replacement heifers discontinued |
|
Prior to 2003 - weaned heifers fed hay in alley way where foot traffic may contaminate with manure |
New protocol in 2003 - off ground hay feeder constructed |
|
Prior to 2003 - bred heifers and dry cows
housed together, dry cows and breeding age heifers share water
source |
Under review |
|
Prior to 2003 - breeding age heifers occasionally
fed waste feed from lactating cows |
2003 - discontinued |
|
Back to top
Testing Results
Back to top
|
