Illinois Voluntary Johne's Certification Program
Johne's Disease Control on Illinois Dairy and Beef Cattle Operations

Prevalence and Impact

Midwest regional surveys of dairy operations estimate that from 3-18% of all cows are infected. A Wisconsin study showed that 33% of Wisconsin herds have one or more infected animals. Since the disease advances through the herd at a slow pace, producers can expect about 15 to 25 infected animals for each animal showing clinical signs.

The NAHMS Dairy 96 study estimated in infected herds where at least 10% of cull cows showed clinical signs similar to Johne's, the average cost to producers was $227 per cow in the herd per year. The costs of Johne's disease in a herd can be attributed to:

premature culling
higher replacement costs
decreased milk production (7-25% in affected animals)
reduced feed efficiency
decreased slaughter weight
loss of marketing opportunity

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