Johne's Disease in Michigan

Michigan Johne's Disease Control Demonstration Project

Dairy Herd 4
Freestall barn

Characteristics
Risk Assessment
Testing Results
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Characteristics

CATEGORY	CHARACTERISTICS
Breed	Jersey/Organic
Housing	free stall/concrete lot/pasture
Feeding System	TMR/Grazing
Expanding?	No
Raise own replacements	Yes
Open or closed herd	Closed
# Lactating cows	2003: 81 2004: 67 2005: 68 2006: 87
Breeding Program	AI
Rolling Herd Average
Calving	One calving pen with 1-2 cows in pen at a time. Cleaned between calvings.
Colostrum feeding	One cow to one calf.
Waste milk feeding	Limited feeding of waste milk from cows that have tested negative for Johne's Disease multiple times.
Management of cattle that test positive for Johne's disease	Culled

Risk Assessment cow

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:

Occasional clinical cases in raised animals, generally older
Clinical cases are 2 to
5% of herd/year average 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

Major Risk Areas and Preventative Actions

Johne’s Disease Transmission Risk	What’s been done to decrease risk	Long-term goal
Multiple cow calving area also used as sick pen.	One cow in calving area at a time, cleaned and rebedded, no more sick cows placed in maternity area.
Calves left with dam for up to 7 days.	Calves removed immediately.
Pre-weaned calves housed next to maternity pen in group housing.	Calves raised in individual pens separate from adult cows.	.
Calves fed waste milk.	Calves fed milk replacer.	Transition back to whole milk to meet desires of organic milk co-op.
Weaned calves housed next to lactating cow maternity free stall area.		Build new replacement heifer faciltiy.

Testing Results

Whole Herd Prevalence

NAHMS 2002 Johne's Report