This evaluation should be conducted on every bull at least 30 to 60 days before each breeding season to allow enough time for replacement of deferred or unsatisfactory bulls.
Bulls differ in reproductive capabilities.
In evaluating bulls for use in natural mating, three parameters have been shown to be the most reliable and repeatable. This part of the exam may be the most difficult to objectively assess. Some structural defects may have little or no influence on immediate mating ability but may predispose animals to early development of arthritis or injuries. As affected bulls age, the defect becomes more severe and serving capacity is reduced. Many hoof and sole problems result from poor conformation and may require trimming and other treatments to maintain serving capacity.