Photoperiod influences the critical caloric intake necessary to maintain reproduction among male deer mice (Peromyscus maniculatus).
Photoperiod influences the critical caloric intake necessary to maintain reproduction among male deer mice (Peromyscus maniculatus).
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光周期影响雄性鹿鼠（Peromyscus maniculatus）维持繁殖所需的关键热量摄入。
DOI：
10.1095/biolreprod46.2.226
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发表时间：
1992
影响因子：
3.6
通讯作者：
Rhyne-Grey,J
中科院分区：
文献类型：
--
作者：
Nelson,RJ;Kita,M;Blom,JM;Rhyne-Grey,J
临界日长的概念在啮齿类动物中已经确立;当日长大于某些特定阈值时，生殖功能得以维持。除了白天长度的线索，鹿鼠的季节性繁殖也可以通过食物供应来调节。对于季节性繁殖的啮齿动物，维持生殖所需的热量阈值仍不明确。本研究探讨了光周期和食物可利用性对成年雄性鹿鼠生殖功能的相互作用。一个关键的热量摄入配置文件中构建的长（16 L：8D）和短（8L：16 D）光周期;组的鹿小鼠在两个光周期中要么接受食物随意或90，80，或70%的个人随意食物摄入量为10周。尸检时，取出成对的睾丸、附睾和精囊并称重。还获得了体重、全身脂肪和全身水分含量。与长日照相比，短日照会抑制雄性鹿鼠的生殖系统。但摄食量与光周期相互作用，影响生殖功能。在短日照小鼠中观察到，在随意食物摄入量减少10%后，生殖器官大小和生精活性显著降低。长日动物需要减少20%的热量摄入来抑制生殖功能。体重和总的身体水分含量一般不受光周期或食物消耗。与长日照小鼠相比，短日照小鼠的总体脂含量降低。个体对短日照的生殖反应随着食物供应的减少而增加。限制在70%自由采食量的长日照雄性和自由采食的短日照雄性之间的生殖器官质量和生精活性相当;即，与不受限制地获取食物的长日照雄性相比，两组都表现出显著的生殖退化。然而，这些“退化”的男性中很少有人是无精子的。相比之下，短日照加上30%限制食物摄入的抑制作用导致几乎所有小鼠停止精子发生。总之，这些结果证实，短的光周期导致性腺大小和精子产量的统计学显着减少，然而，食物的可用性可能会决定是否减少精子数量是功能显着的。
The concept of critical day length is well established among rodents; reproductive function is maintained when day lengths are greater than some specific threshold. In addition to day length cues, seasonal breeding in deer mice can also be regulated by food availability. The caloric threshold necessary to support reproduction remains unspecified for seasonally breeding rodents. The present study examined the interaction between photoperiod and food availability on reproductive function in adult male deer mice (Peromyscus maniculatus). A critical caloric intake profile was constructed in long (16L:8D) and short (8L:16D) photoperiods; groups of deer mice in both photoperiods either received food ad libitum or 90, 80, or 70% of their individual ad libitum food intake for 10 wk. At autopsy, paired testes, epididymides, and seminal vesicles were removed and weighed. Body mass, total body fat, and total body water contents were also obtained. Short, as compared to long, day lengths inhibited the reproductive systems of male deer mice. However, food consumption interacted with photoperiod to affect reproductive function. Significant reductions in reproductive organ size as well as spermatogenic activity were observed among short-day mice after a 10% reduction in ad libitum food intake. Long-day animals required a 20% reduction in caloric intake to depress reproductive function. Body mass and total body water content were generally unaffected by either photoperiod or food consumption. Total body fat content was reduced in short- as compared to long-day mice. Individual reproductive responsiveness to short days increased as food availability decreased. Reproductive organ mass and spermatogenic activity were comparable between longday males restricted to 70% of their ad lib food intake and short-day males fed ad libitum; i.e., both groups exhibited significant reproductive regression as compared to long-day males with unrestricted access to food. However, few of these ‘regressed’ males were aspermic. In contrast, the inhibitory effects of short day lengths plus 30% restricted food intake caused virtually all mice to stop spermatogenesis. Taken together, these results confirm that short photoperiods cause statistically significant reduction in gonadal size and sperm production; however, food availability may determine whether the reduction in sperm number is functionally significant.
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