Hellgren E C, Lochmiller R L, Amoss M S, Seager S W, Magyar S J, Coscarelli K P, Grant W E
Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station 77843.
J Reprod Fertil. 1989 Mar;85(2):677-86. doi: 10.1530/jrf.0.0850677.
Blood samples and testicular measurements were obtained from 4-8 captive adult collared peccaries monthly for 18 months and from wild adult males during summer (N = 16) and winter (N = 22) seasons. Serum concentrations of testosterone were determined by radioimmunoassay. Semen samples were collected monthly by electroejaculation from captive males for 1 year. Serum testosterone concentrations and testicular measurements varied in a low-amplitude circannual pattern, with maximum mean testosterone concentrations in fall and winter (1150-1400 pg/ml) and minimum values in summer (500-700 pg/ml). Circannual rhythms appeared to be related to dominance. Serum testosterone levels in wild males generally were lower than in captive males, although this difference was not significant (P greater than 0.05). Semen characteristics did not exhibit a circannual rhythm. These results suggest that the male peccary remains reproductively fertile throughout the year, yet may undergo a facultative summer quiescence influenced by ambient temperature and social factors.
在18个月的时间里，每月从4 - 8只圈养成年领西猯身上采集血样和进行睾丸测量，同时在夏季（N = 16）和冬季（N = 22）从野生成年雄性身上采集血样和进行睾丸测量。通过放射免疫测定法测定血清睾酮浓度。通过电刺激法每月从圈养雄性身上采集精液样本，持续1年。血清睾酮浓度和睾丸测量值呈低幅度的年周期模式变化，秋季和冬季的平均睾酮浓度最高（1150 - 1400 pg/ml），夏季最低（500 - 700 pg/ml）。年周期节律似乎与优势地位有关。野生雄性的血清睾酮水平通常低于圈养雄性，尽管这种差异不显著（P大于0.05）。精液特征未表现出年周期节律。这些结果表明，雄性西猯全年都保持生殖能力，但可能会受到环境温度和社会因素的影响而在夏季进入一种兼性静止状态。
