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Reproductive characteristics of stallions during the breeding and non-breeding season in a tropical region

机译：热带地区繁殖和非繁殖季节种马的繁殖特征

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The objective of this study was to investigate reproductive characteristics of stallions at a tropical zone in the breeding and non-breeding seasons. The following parameters were assessed: testicular volume; semen quality; and serum concentrations of LH, FSH, and testosterone; in addition to the percentages of germ cells and proportions of germ cells/Sertoli cells by testicular cytology in stallions. Semen was collected from eight adult stallions twice a week during a 12-week period in both seasons (6 weeks before and 6 weeks after the summer and winter solstices). Jugular blood samples were collected periodically for hormone analysis by radioimmunoassay during the same periods. Testicular measures and cytological samples were taken at the end of each period. Mean concentration of testosterone was significantly higher (P = 0.04) during the breeding season and the proportion of Sertoli cells/100 germ cells in cytological smears was significantly lower during the breeding season (P = 0.0001). Effects of season were not significant either for testicular volume or for any semen parameter (P > 0.05). Seasonal changes in the mean concentrations of LH and FSH were not observed (P > 0.05). There were also no significant differences in the mean percentages of germ cell types between both seasons (P > 0.05). Lack of seasonal differences in the testicular volume and semen parameters of tropical stallions are probably due to the small variation in duration of natural light between the observed periods, slightly under 3 h.
机译：这项研究的目的是调查繁殖和非繁殖季节热带地带种马的繁殖特征。评估以下参数：睾丸体积;精液质量血清中LH，FSH和睾丸激素的浓度;除了通过种皮睾丸细胞学检测的生殖细胞百分比和生殖细胞/睾丸支持细胞的比例。在两个季节（夏至冬至之前和之后的6周和6周之后）的12周内，每周两次从八个成年公马中收集精液。在同一时期，定期收集颈静脉血样以进行放射免疫测定法进行激素分析。在每个时期的末期采取睾丸测量和细胞学样本。在繁殖季节，睾丸激素的平均浓度显着较高（P = 0.04），而在细胞学涂片中Sertoli细胞/ 100生殖细胞的比例在繁殖季节显着较低（P = 0.0001）。无论是睾丸体积还是精液参数，季节的影响都不显着（P> 0.05）。没有观察到LH和FSH平均浓度的季节性变化（P> 0.05）。两个季节之间生殖细胞类型的平均百分比也没有显着差异（P> 0.05）。热带种马的睾丸体积和精液参数缺乏季节性差异，可能是由于观察到的时间（略低于3小时）之间自然光持续时间的微小变化所致。

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