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Abstract
The aim of the study was to assess the influence of summer and winter seasons on semen quality and plasma hormone concentrations in cross-bred bulls. Semen was collected by an artificial vagina from eight bulls and microscopically evaluated for quality parameters. Semen volume was higher in summer season (p < 0.05) than winter season, whereas nonsignificant variation (p > 0.05) was observed in mass motility, individual motility, sperm viability, sperm concentration and percentage of membrane-intact and acrosome-intact spermatozoa. Plasma prolactin and testosterone concentration were significantly (p < 0.01) higher in summer season than winter season. Plasma testosterone levels were positively correlated with semen volume and negatively correlated with individual motility (p < 0.05). Prolactin showed a significant positive correlation with semen volume. A well-defined seasonal pattern in semen characteristics was not observed and few correlations existed between plasma hormone levels and semen characteristics in Karan Fries bulls.
Acknowledgments
The authors express their gratitude to the Director, National Dairy Research Institute, Karnal, for providing all facilities to conduct the study.