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有关24小时内催乳素分泌的节律目前还有争论。松果腺的黑素紧张素(Melatonin)的分泌对羊来说与自然光照期间有密切关系,不同人工光照周期对黑素紧张素分泌的型式有明显的影响。本文用饲喂黑素紧张素并在人工控制光照周期的条件下,研究母羊在不同实验、不同时间观察24小时内血浆催乳素水平。实验用1-3岁Suzfoth-cross未经交配的母羊。动物在自然光照周期适应两周后,并判断无动情期活动分三组,分别喂养在人工控制光照周期不同的栏内。孕酮水平在8周前使之维持在基础水平。A组接受16小时光照8小时黑暗的光照周期(16L∶8D),每天在16.5时接受含3mg黑素紧张素的食丸,使动物血浆黑素紧张素水平很快达到生理范围最高水平,维持8小时。B组接受8L∶16D
The rhythm of prolactin secretion within 24 hours is still debated. Secretion of melatonin from the pineal gland is closely related to the natural lighting period in sheep, and different artificial lighting periods have a significant effect on the type of melanocortin secretion. In this paper, the use of melanin and feeding under the conditions of artificial control of the light cycle, study ewe in different experiments, at different times observed in 24 hours plasma prolactin levels. Experiments with 1-3-year-old Suzfoth-cross unpaired ewes. After two weeks of adaptation, the animals were divided into three groups according to the period of natural light, and were divided into three groups, which were fed in different fields with manual control of light period. Progesterone levels maintained at baseline levels eight weeks ago. Group A received 16 hours of light and 8 hours of darkness (16L: 8D) and received daily doses of 3 mg of melanin at 16.5 hours to reach the highest physiologic range 8 hours. Group B received 8L: 16D