Khalil A M, Murakami N, Kaseda Y
Laboratory of Animal Behavioral Science, Faculty of Agriculture, Miyazaki University, Japan.
J Vet Med Sci. 1998 May;60(5):643-5. doi: 10.1292/jvms.60.643.
Jugular vein blood samples were collected from 23 young and sexual mature feral stallions to examine the relationship between plasma testosterone concentration and age, breeding season or harem size. Testosterone concentration increased with the age of the stallions until they formed their own harems, at about 4 to 6 years old. Seasonal variations in testosterone concentrations were observed, and found to be significantly higher (P<0.001) throughout the breeding season than non-breeding season, from 3 years of age. Testosterone levels were correlated with harem size for individual stallions. It can be inferred from these results that there is a relationship between plasma testosterone concentration and age, breeding season and harem size.
采集了23匹年轻且性成熟的野生种马的颈静脉血样，以研究血浆睾酮浓度与年龄、繁殖季节或妻妾群规模之间的关系。睾酮浓度随着种马年龄的增长而增加，直到它们在大约4至6岁时组建自己的妻妾群。观察到睾酮浓度存在季节性变化，并且发现从3岁起，整个繁殖季节的睾酮浓度显著高于非繁殖季节（P<0.001）。个体种马的睾酮水平与妻妾群规模相关。从这些结果可以推断，血浆睾酮浓度与年龄、繁殖季节和妻妾群规模之间存在关联。
