Bacon W L, Long D W
Ohio State University, Ohio Agricultural Research and Development Center, Department of Poultry Science, Wooster 44691-4096, USA.
Domest Anim Endocrinol. 1995 Jul;12(3):257-67. doi: 10.1016/0739-7240(95)00023-8.
Luteinizing hormone (LH) has been reported to increase in plasma shortly after switching photosensitive turkey hens from short-day (SD) photoperiods (6 hr light:18 hr dark) to long-day (LD) photoperiods (14 hr light: 10 hr dark). An experiment was conducted to determine the timing and nature of these changes in plasma LH concentrations after the photostimulation of photosensitive turkey hens. The turkey hens were cannulated (jugular vein) to allow serial bleeding every 15 min for 48 hr. One group (controls) was continued under the SD photoperiod, and one group (treated) was switched to the LD photoperiod by the addition of 8 hr of light to the end of the photoperiod. In the control hens, no changes were seen in the observed or calculated baseline concentrations of LH or in the frequency and amplitude of LH peaks during the 48 hr of serial bleeding. In the treated hens, the observed and baseline concentrations of LH increased during the first LD scotoperiod, with a further increase during the second LD scotoperiod. This rapid increase was due to an increase in the baseline LH concentration, whereas no consistent changes were detected in the frequency and amplitude of LH peaks.
据报道，将光敏火鸡母鸡从短日照（SD）光周期（6小时光照：18小时黑暗）转换为长日照（LD）光周期（14小时光照：10小时黑暗）后不久，血浆中的促黄体生成素（LH）会增加。进行了一项实验，以确定光敏火鸡母鸡光刺激后血浆LH浓度变化的时间和性质。对火鸡母鸡进行颈静脉插管，以便每15分钟进行一次连续采血，持续48小时。一组（对照组）继续处于SD光周期下，另一组（处理组）通过在光周期结束时增加8小时光照转换为LD光周期。在对照母鸡中，连续采血48小时期间，观察到的或计算出的LH基线浓度以及LH峰值的频率和幅度均未发生变化。在处理组母鸡中，观察到的LH浓度和基线浓度在第一个LD暗期增加，在第二个LD暗期进一步增加。这种快速增加是由于LH基线浓度增加，而LH峰值的频率和幅度未检测到一致变化。
