Ahmad N, Noakes D E
Department of Large Animal Medicine and Surgery, Royal Veterinary College, University of London, Hatfield, Herts, UK.
Br Vet J. 1996 Jan;152(1):93-103. doi: 10.1016/s0007-1935(96)80089-3.
Eight male kids of British Sannen and one each of the British Alpine and British Toggenberg breed, born between the last week of February and first week of March 1990, were used. From the age of 12 weeks, they were monitored every week for body and testicular growth and sexual development, until they attained sexual maturity. The development of the sexual behaviour was a gradual process. From 12 weeks of age, the body weight increased at a constant rate. Testicular development, however, showed a biphasic pattern; the testis size increased rapidly between 12 and 20 weeks of age and was followed by a period of slow growth. Sexual maturity occurred at a mean age of 172.7 +/- 4.47 days, and at a mean body weight of 31.25 +/- 1.50 kg when the mean values of scrotal circumference, testis diameter and paired testes width were 24.13 +/- 0.47 mm, 54.01 +/- 1.26 mm and 88.31 +/- 1.61 mm, respectively. In most kids, the quality of the first ejaculate was good, although it varied widely between animals. It appeared that sexual maturity in British goat kids occurs at a younger age than in different breeds in other parts of the world that have been reported in the literature.
选用了8只英国萨能公山羊幼崽，以及1只英国阿尔卑斯公山羊幼崽和1只英国吐根堡公山羊幼崽，它们均出生于1990年2月最后一周至3月第一周期间。从12周龄开始，每周对它们的身体和睾丸生长以及性发育情况进行监测，直至达到性成熟。性行为的发育是一个渐进的过程。从12周龄起，体重以恒定速率增长。然而，睾丸发育呈现双相模式；睾丸大小在12至20周龄之间迅速增加，随后是一段缓慢生长时期。性成熟发生的平均年龄为172.7 +/- 4.47天，平均体重为31.25 +/- 1.50千克，此时阴囊周长、睾丸直径和双侧睾丸宽度的平均值分别为24.13 +/- 0.47毫米、54.01 +/- 1.26毫米和88.31 +/- 1.61毫米。在大多数幼崽中，首次射精的质量良好，不过不同动物之间差异很大。英国山羊幼崽的性成熟似乎比世界其他地区文献报道的不同品种山羊幼崽的性成熟年龄更早。
