Data from 129 young Simmentaler bulls, 97 Santa Gertrudis bulls and 100 Hereford bulls taken at the end of the Phase C growth tests, were used to study the relationship of mass and growth parameters on testes size. Scrotal circumference was positively correlated with body mass and average daily gain per day of age. Preweaning gain appears to positively influence testicular circumference more than postweaning gain during a feedlot test. Therefore the probability of finding bulls with relatively small testes among bulls selected for weaning mass would be relatively small. Growth rate and reproductive potential appears to be compatible in young performance tested bulls. Selection for scrotal circumference will thus be useful not only because of its compatibility with growth rate, but because improved fertility will increase productivity.

F. JC Swanepoel, H. Heyns

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 275–278, 1990
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