Sexually Transmitted Diseases of Bulls.

Reproduction is essential for successful cow-calf and dairy production and the most important economic trait for cow-calf producers. For efficient reproduction to occur in beef herds, cows or heifers must conceive early during the breeding season, maintain the pregnancy, calve unassisted or with very little assistance, rebred in a timely manner and wean a calf every year. In the case of dairy cattle, cows or heifers are expected to become pregnant, maintain the pregnancy, and calve every 12 to 15 months to produce milk. Interruption of that process leads to delay or total loss of production. Although fertile bulls are required to achieve reproduction, they come with potential risk of transmitting disease during breeding.