Price E O, Wallach S J
Dept. of Anim. Sci., University of California, Davis 95616.
J Anim Sci. 1991 Mar;69(3):1041-6. doi: 10.2527/1991.6931041x.
The objective of this investigation was to determine the extent to which the sexual performance of adult bulls (18 to 24 mo of age) can be predicted by prepuberal sexual behaviors. Tests were administered to 121 polled Hereford bulls to determine whether adult sexual performance (especially serving capacity or ejaculation rate) was related to 1) whether or not the subjects mounted estrous females at 6 mo of age, 2) the age at which the bulls attained their first ejaculation, 3) the frequency of sexual behaviors exhibited in heterosexual interactions and 4) the frequency of male-male mounting exhibited in all-male groups. None of the above measures reliably predicted adult serving capacity. Prepuberal interest in mounting other males and estrous females and the age at which ejaculatory competence was attained bore little relationship to serving capacity at 18 to 24 mo. Individual differences in rate of ejaculation were consistent from one age to another only after the bulls had reached 18 mo. We concluded that the sexual behaviors of prepuberal beef bulls were of limited usefulness in predicting adult sexual performance.
本研究的目的是确定青春期前的性行为对成年公牛（18至24月龄）性行为表现的预测程度。对121头无角海福特公牛进行了测试，以确定成年后的性行为表现（尤其是配种能力或射精率）是否与以下因素相关：1）公牛在6月龄时是否爬跨发情母牛；2）公牛首次射精的年龄；3）在异性互动中表现出的性行为频率；4）在全雄组中表现出的公牛间爬跨频率。上述指标均不能可靠地预测成年公牛的配种能力。青春期前对爬跨其他公牛和发情母牛的兴趣以及获得射精能力的年龄与18至24月龄时的配种能力几乎没有关系。只有在公牛达到18月龄后，射精率的个体差异才在不同年龄间保持一致。我们得出结论，青春期前肉用公牛的性行为在预测成年后的性行为表现方面作用有限。
