Sexual maturation in male Belding's ground squirrels: influence of body weight.
Sexual maturation in male Belding's ground squirrels: influence of body weight.
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雄性贝尔丁地松鼠的性成熟：体重的影响。
DOI：
10.1095/biolreprod33.2.302
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发表时间：
1985
影响因子：
3.6
通讯作者：
Holmes,WG
中科院分区：
文献类型：
--
作者：
Bushberg,DM;Holmes,WG
通过控制断奶雄性幼鼠的食物供应量，研究了冬眠动物贝尔丁黄鼠的体重与性成熟之间的关系。在夏季进行体重控制后，在随后的一年中监测睾丸生长、血清睾酮和精子发生，其中包括雄性在冷藏室中的7个月（约10个月）。8°C），然后在实验室中进行5个月（约10. 20°C）。保持限制饮食的幼鱼（<1岁）以其自然年龄段的正常体重进入冷藏室，全年性腺不成熟，这是该群体在野外的特征。相比之下，青少年给予丰富的食物在夏季进入冷室的体重典型的自由生活的一岁鸽，并表现出成熟的性腺后不久，男性被从寒冷（高相对睾丸重量，高血清睾酮水平，和精子发生的所有阶段）。高水平的性腺活动在过度喂养的男性被限制在一段时间内的几个星期在春天，这正好与交配发生在自然界中的时间。雄性贝尔丁地松鼠在冬眠前积累体重的能力似乎对这种季节性繁殖的啮齿动物的性成熟很重要。
The relation between body weight and sexual maturation was examined in a hibernator, Belding’s ground squirrel, by manipulating the availability of food to weaned juvenile males. Following body weight manipulation in the summer, testicular growth, serum testosterone, and spermatogenesis were monitored during the subsequent year, which included 7 mo when males were in the coldroom (ca. 8°C), followed by 5 mo in the laboratory (ca. 20°C). Juveniles (<1 yr old) maintained on a restricted diet entered the coldroom at normal body weights for their age class in nature and had immature gonads throughout the year, which is characteristic of this group in the field. In contrast, juveniles given abundant food during the summer entered the coldroom at body weights typical for free-living yearlings and exhibited mature gonads shortly after males were removed from the cold (high relative testis weights, high serum testosterone levels, and all stages of spermatogenesis). The high level of gonadal activity in overfed males was confined to a period of a few weeks in the spring, which coincided with the time when mating occurs in nature. The ability of male Beldings ground squirrels to accumulate body weight prior to hibernation seems important to sexual maturation in this seasonally breeding rodent.
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影响因子：
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作者：
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DOI：
--
发表时间：
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