Effect of delayed step-up lighting on plasma luteinizing hormone and reproductive function in broiler breeders.
Effect of delayed step-up lighting on plasma luteinizing hormone and reproductive function in broiler breeders.
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DOI：
10.1093/ps/79.5.778
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发表时间：
2000-05
期刊：
影响因子：
4.4
通讯作者：
F. Nøddegaard;R. Talbot;P. Sharp
中科院分区：
文献类型：
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作者：
F. Nøddegaard;R. Talbot;P. Sharp
该研究的目的是建立，在当代肉鸡育种，是否延迟光刺激在313天的结果在生殖反应类似于光刺激后，在134天（标准做法）。将标准光照程序与新程序进行比较，在新程序中，在饲养期间每天光照时间减少到3 h，并保持在3 h，直到264 d（8 h）或313 d（16 h）的光刺激。该实验是用自由采食或限饲母鸡进行的。在光刺激和非光刺激母鸡，限饲推迟了产蛋的开始，并提高了随后的产蛋率。标准光刺激提前了产蛋的开始，并增加了随后的产蛋率在自由采食和限饲母鸡。延迟光刺激母鸡不损害光诱导的血浆促黄体生成素（LH）浓度或产蛋量的增加。延迟光刺激公鸡未能刺激LH分泌。出乎意料的是，对于饲料限制的母鸡，在264天从3到8 h光照/d的转移导致血浆LH增加和产蛋量增加。同样光照处理的公鸡血浆LH也有类似的增加。我们的结论是，在肉种鸡，光刺激的生殖反应不受损害，如果光刺激被延迟长达313天。公鸡可能对延迟的光刺激反应不好。
The aim of the study was to establish, in contemporary broiler breeders, whether delayed photostimulation at 313 d results in a reproductive response similar to that after photostimulation at 134 d (standard practice). The standard lighting program was compared with a novel program in which daily hours of light were reduced to 3 h during rearing and kept at 3 h until photostimulation at 264 d (8 h) or at 313 d (16 h). This experiment was done with hens fed ad libitum or feed-restricted hens. In photostimulated and nonphotostimulated hens, feed restriction delayed the onset of egg production and enhanced the subsequent rate of laying. Standard photostimulation advanced the onset of lay and increased the subsequent rate of lay in hens fed ad libitum and feed-restricted hens. Delayed photostimulation of hens did not impair the photoinduced increase in the concentration of plasma luteinizing hormone (LH) or egg production. Delayed photostimulation in cockerels failed to stimulate LH secretion. Unexpectedly, for feed-restricted hens, transfer from 3 to 8 h light/d at 264 d resulted in an increased in plasma LH and increased egg production. A similar increase in plasma LH was observed for cockerels subjected to the same lighting treatment. We concluded that, in broiler breeder hens, the reproductive response to photostimulation is not impaired if photostimulation is delayed for up to 313 d. Cockerels may not respond well to delayed photostimulation.