Check herbicide and pesticide labels for harvest restrictions before using any stressed corn for feed. Johne's results in lost milk production and limited salvage value of infected animals. Johne's most often infects dairy and beef cattle, sheep and goats. Some incidences have been reported in white-tailed deer. A. Primarily through ingestion of feed or water contaminated by manure from infected animals.
Infected dams can pass the disease to calves while nursing, through their colostrum and milk.
Feed intake may remain normal. Diarrhea may begin intermittently and progress to persistent, usually without a fever. Symptoms usually first appear when the animal is about 2 years old, following a physical stress like calving. However, visible signs of Johne's may not appear for 10 years or more. The best detection is a fecal culture test.