Due to the importance of natural service in the beef cattle industry and the fact that growth rate and scrotal circumference are both considered in the selection of young bulls, information on the relationship between growth and scrotal cir= cumference would be helpful. Body weight affects scrotal circumference and is a function of birth weight, preweaning and postweaning growth rate, and age, all of which may influence testis development. It is evident that the preweaning stage is the most critical period for testicular development. Consistency of testes, a minimum scrotal circumference and previous level of nutrition can be taken into account when evaluating bulls. Scrotal circumference is easily measured, highly heritable and favourably related to semen quality. Scrotal circumference has little influence on libido. Scrotal circumference is a more reliable parameter for sexual development in B. indicus than in B ■ taurus breeds.

F. JC Swanepoel, H. AW Venter, J. GE van Zyl, H. Heyns

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 66–71, 1986
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