Sexual behavior of the bull: a review.

Development of sexual behavior, puberty, and social behavior is described in bulls. Normal mating behavior is discussed, including the relative importance of visual and olfactory cues as stimuli. The influence of sexual preparation on quantitative and qualitative seminal characteristics is reviewed. Attention is drawn to the strong genetic influences on libido and mating ability in bulls. The evidence for biostimulation in cattle is examined, with the conclusion that more investigation and exploitation of this phenomenon is warranted.