Gow C B, Sharp P J, Carter N B, Scaramuzzi R J, Sheldon B L, Yoo B H, Talbot R T
Br Poult Sci. 1985 Oct;26(4):441-51. doi: 10.1080/00071668508416834.
The effects of selection under continuous light for reduced oviposition interval within a sequence of eggs on plasma luteinising hormone (LH) concentrations during the ovulatory cycle were investigated in lines of Australorps and White Leghorns maintained on a 24-h light:dark cycle. Selection did not significantly alter LH concentrations during mid-sequence cycles in either breed. In the control lines, concentrations were higher in the Australorps than in the White Leghorns before and at peak in mid-sequence cycles. The increase in egg production resulting from selection was associated with an advance in the mean time of lay of mid-sequence eggs in both breeds and, in the Australorps, with more pre-ovulatory LH peaks being initiated at the beginning of the open period of the ovulatory cycle. Selection reduced the time an egg spends in the oviduct and, in the Australorps, significantly reduced the interval between a pre-ovulatory LH peak and the oviposition of the egg currently in the shell gland. We suggest that selection under continuous light for reduced oviposition interval increased the rate of ovarian follicular maturation by a mechanism which did not involve an increase in pre-ovulatory concentration of plasma LH in a 24-h light-dark cycle.
在维持24小时光照：黑暗周期的澳洲黑鸡和白来航鸡品系中，研究了连续光照下选择缩短一系列蛋内产卵间隔对排卵周期血浆促黄体生成素（LH）浓度的影响。选择并未显著改变两个品种中期周期的LH浓度。在对照品系中，中期周期前及高峰期，澳洲黑鸡的浓度高于白来航鸡。选择导致的产蛋量增加与两个品种中期蛋平均产蛋时间提前有关，在澳洲黑鸡中，与排卵周期开放期开始时更多排卵前LH峰的启动有关。选择缩短了蛋在输卵管中的停留时间，在澳洲黑鸡中，显著缩短了排卵前LH峰与当前在壳腺中的蛋的产卵之间的间隔。我们认为，在连续光照下选择缩短产卵间隔通过一种不涉及24小时明暗周期中排卵前血浆LH浓度增加的机制提高了卵巢卵泡成熟率。
