Hochereau-de Reviers M T, Perreau C, Lincoln G A
J Reprod Fertil. 1985 Jul;74(2):329-34. doi: 10.1530/jrf.0.0740329.
Seasonal changes in the Leydig, Sertoli and stem cells (undifferentiated A0 and cyclic A1) spermatogonia and the daily spermatid production were analysed in the testes of adult Soay rams exposed to short days (8L:16D) or long days (16L:8D) for 12 weeks. The total numbers of Leydig, Sertoli and stem cells (A0 + A1) were not affected by the treatments, but the size of the Leydig and the Sertoli cells, the efficiency of spermatogenesis (i.e. the number of male gametes produced by an A1 spermatogonium) and the daily sperm production were all significantly reduced in the rams exposed to long days. There was a positive correlation between the concentration of FSH and testosterone and many of the cytological changes consistent with a causal role for these hormones in mediating the effects of photoperiod on the testicular function in the ram.
对成年索艾公羊的睾丸进行分析，研究其在短日照（8小时光照：16小时黑暗）或长日照（16小时光照：8小时黑暗）条件下暴露12周后，睾丸间质细胞、支持细胞和干细胞（未分化的A0型和周期性A1型）精原细胞的季节性变化以及每日精子细胞生成情况。睾丸间质细胞、支持细胞和干细胞（A0 + A1）的总数不受处理影响，但在长日照条件下的公羊中，睾丸间质细胞和支持细胞的大小、精子发生效率（即一个A1型精原细胞产生的雄配子数量）以及每日精子生成量均显著降低。促卵泡激素（FSH）和睾酮浓度与许多细胞学变化之间存在正相关，这表明这些激素在介导光周期对公羊睾丸功能的影响中起到了因果作用。
