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Seasonal variation in semen quality of swamp buffalo bulls （Bubalus bubalis） in Thailand

Asian Journal of Andrology 2007年第1期9卷 92-101页

作者： Seri Koonjaenak Vichai Chanatinart Suneerat Aiumlarllai Tanu Pinyopumimintr heriberto rodfiguez-martinez Division of Comparative Reproduction Obstetrics and Udder Health Department of Clinical Sciences Faculty of Veteri nary Medicine and Animal Sciences Swedish University of Agricultural Sciences Uppsala SE-75007 Sweden Department of Anatomy Faculty of Veterinary Medicine Kasetsart University Bangkok 10900 Thailand Artificial Insemination Centre Department of Livestock Development Khon Kaen 40260 Thailand Department of Surgery and Theriogenology Faculty of Veterinary Medicine Khon Kaen University Khon Kaen 40002 Thailand Department of Large Animals and Wildlife Clinical Sciences Faculty of Veterinary Medicine Kasetsart University Nakon Prathom 73140 Thailand

Aim： To test the hypothesis that season affects the semen quality of swamp buffalo （Bubalus bubalis） bulls used for artificial insemination （AI） under tropical conditions in Thailand, as it does in Bos taurus and Bos indicus. Methods： Clinical and andrological examinations, and monitoring of semen production and quality were carried out on five mature, healthy swamp buffalo AI bulls in Thailand from July 2004 to the end of June 2005. Sperm output, motility, morphology and plasma membrane integrity （PMI） were compared between three seasons of the year （rainy, i.e. July-October; winter, i.e. November-February; and summer, i.e. March-June） with distinct ambient temperature and humidity. Results： All bulls were diagnosed as clinically healthy and with good libido throughout the study. Ejaculate volume, pH, sperm concentration, total sperm number and initial sperm motility did not differ between seasons, whereas PMI and the relative proportion of morphologically normal spermatozoa were highest in summer and lowest in winter （P 〈 0.05）. Buffalo age, week of collection and season influenced sperm morphology （P 〈 0.05-0.001）. Among morphological abnormalities, only proportions of tail defects were affected by season, being highest in the rainy season and lowest in summer （P 〈 0.001）. In conclusion, climatic changes did not seem to largely affect semen sperm output or viability. Although the proportions of PMI and tail abnormalities were affected by season, they were always below what is considered unacceptable for AI bull sires. Conclusion： Seasonal changes did not appear to cause deleterious changes in sperm quality in swamp buffalo AI-sires in tropical Thailand.

关键词： sperm morphology sperm motility seasonality swamp buffalo artificial insemination

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