Dairy Today Editors
In a Minnesota study involving two dairies and 1,048 cows, Johne's positive cows failed on virtually all measures.
Johne's positive cows produced nearly 3,000 lb. less milk per lactation than Johne's negative herdmates. Income over feed costs were $366/cow/lactation less for the Johne's positive cows. They also produced $276/cow less milk income.
Johne's positive cows were also three times more likely to be culled than negative herdmates. And when they were culled, they produced $120/cow less beef residue.
The study, done by the University of Minnesota's School of Veterinary Medicine, is in the October issue of the Journal of Dairy Science. For the abstract, go to: