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Assessment of Serum PRL,MLT,TSH,FSH and LH Concentrations in the goat (Capra hircus) Exposing to Different Photoperiod Regimes

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Agricultural Biotechnology 2018年第4期7卷 110-114,117页

作者： Huibin SHI Zhilong TIAN Yuqin WANG Zhibo WU Fang YANG Jianping WANG Mingxing CHU CaiHong WEI College of Animal Science and Technology Henan University of Science and TechnologyLuoyang 471003China Mutton Sheep Breeding Engineering Technology Research Center of Henan Province Luoyang 471019China Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture Institute of Animal ScienceChinese Academy of Agricultural SciencesBeijing 100193China

In many seasonally breeding species, photoperiod is an important factor involved in reproduction. Capra hircus breeds are normally considered short-day breeders. An experiment was carried out to evaluate whether or not photoperiodic regimens influence circulating hormone levels （prolactin, melatonin, thyrotropin stimulating hormine, luteinizing hormone,follicle stimulating hormone） of Henan huai local goat exposing to different photoperiodic regimens. The results showed that plasma levels of prolactin, melatonin, thyrotropin stimulating hormine, luteinizing hormone and follicle stimulating hormone were higher in the 8 L∶ 16 D photoperiodic regimen than that in the 16 L∶ 8 D photoperiodic regimen. Levels of those hormones decreased on day 7 and day 28 when the 16 L∶ 8 D photoperiodic regimen was used continuously. It was concluded that serum concentrations of the hormones increased in summer when short day （8 L∶ 16 D） was used and decreased when the goats were transferred from short day for 42 d to long day exposure for 28 d. We suggest that in summer, levels of hormones changing may be due to short day animals. Changing of related hormones is still determined by the mechanism of internal regulation of short day animal s exposure to light changes. Shortening light may also help increase the reproductive activity of goat and thus increase productivity.

关键词： Photoperiod PRL MLT TSH FSH LH goat introduction

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