Wilson S C, Jennings R C, Cunningham F J
Br Poult Sci. 1985 Jan;26(1):83-96. doi: 10.1080/00071668508416790.
Hens maintained on 16 h light: 8 h darkness were subjected to an abrupt advance of darkness by between 4 and 13 h. When darkness was advanced so that it occurred less than 6 to 8 h after ovulation, the next expected preovulatory release of luteinising hormone (LH) and ovulation was usually delayed or blocked. This was associated with a reduction in the ability of injected ovine LH to stimulate the secretion of progesterone. When the advance meant that darkness occurred at more than 6 to 8 h after ovulation subsequent ovulations were advanced by as much as 5 h within a 3 d period. The hastening effect of an advance of darkness on follicular maturation was associated with an increased secretion of LH in response to injected progesterone. An advance of darkness by 4 or 7 h was associated with an earlier onset of the circadian increase in the secretion of corticosterone and changes in the tonic secretion of LH, notably a tendency for plasma concentrations of LH to increase during the first 4 to 5 h of advanced darkness, followed by a steep decline.
处于16小时光照：8小时黑暗周期的母鸡被突然提前4至13小时进入黑暗环境。当黑暗提前至排卵后不到6至8小时出现时，下一次预期的促黄体生成素（LH）排卵前释放和排卵通常会延迟或受阻。这与注射的羊LH刺激孕酮分泌的能力降低有关。当黑暗提前意味着在排卵后超过6至8小时出现黑暗时，随后的排卵在3天内最多提前5小时。黑暗提前对卵泡成熟的加速作用与注射孕酮后LH分泌增加有关。黑暗提前4或7小时与皮质酮分泌的昼夜节律增加提前开始以及LH的紧张性分泌变化有关，特别是在黑暗提前的前4至5小时血浆LH浓度有增加的趋势，随后急剧下降。
