1108ObserveBullssr.cfm Test, observe bulls as breeding season begins
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Test, observe bulls as breeding season begins

By Glenn Selk

OSU Emeritus Extension Animal Scientist

The fall breeding season is about to begin. Herds that aim for a Sept. 1 first calving date, will turn bulls with the cows in the latter part of November. Bulls that have been recently added to the bull battery, and bulls that have not been used since last year, should pass a breeding soundness exam before the breeding season begins. Any newly purchased bull that has been previously exposed to cows, should also have passed a test for the venereal disease trichomoniasis. Reports from the Oklahoma state veterinarian indicate that 2.5 percent of bulls routinely tested have been found to be positive for this disease. Visit with your veterinarian soon about breeding soundness exams and trich tests to avoid reproductive problems next year and beyond.

A good manager keeps an eye on his bulls during the breeding season to make sure that they are getting the cows bred. Occasionally a bull that has passed a breeding soundness exam may have difficulty serving cows in heat, especially after heavy service.

While conducting a research trial several years ago, I was collecting data on the ability of a bull to breed synchronized cows. The bull (being observed) was mature and had been successfully used in the past. Also he had passed a breeding soundness exam. However, it was apparent immediately that he could no longer physically breed females in estrus. Replacing him immediately was the only solution. If we had not been present to observe the problem, an entire calf crop for that breeding pasture was in jeopardy.

Inability to complete normal service and low semen quality are more likely to be problems that affect breeding performance than failure to detect cows in heat. Nonetheless poor libido can occasionally be observed in beef bulls. Such problems can best be detected by observing bulls while they work. Therefore producers should (if at all possible) watch bulls breed cows during the first part of each breeding season. If problems are apparent, the bull can be replaced while salvaging the remainder of the breeding season and next year's calf crop. Likewise a small proportion of bulls can wear out from heavy service and lose interest. These, too, will need to be replaced. The greater the number of cows allotted to each bull in the breeding pasture the more critical it is that every bull be ready to work every day of the breeding season.

Injuries to bulls during the breeding season are relatively common. When a bull becomes lame or incapable of breeding, because of an injury to his reproductive tract, he needs to be removed from the breeding pasture and replaced with another bull.



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