Seasonal changes in semen quality and correlation with plasma hormone profiles in Karan Fries bulls. Issue 6 (1st November 2016)

• Record Type: Journal Article
• Authors: Mallick, Smrutirekha; Aggarwal, Anjali; Prakash, B. S.
• Is Part Of: Biological rhythm research. Volume 47:Issue 6(2016)
• Page Start: 967
• Page End: 974
• Publication Date: 2016-11-01
• Subjects: Season -- hormone -- semen -- bull; Biological rhythms -- Periodicals; Chronobiology -- Periodicals; Cycles -- Periodicals; Biological Clocks; Chronobiology; Circadian Rhythm; 570
• DOI: 10.1080/09291016.2016.1213361
• Languages: English
• ISSNs: 0929-1016

Abstract

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.