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Testicular Cell Indices and Peripheral Blood Testosterone Concentrations in Relation to Age and Semen Quality in Crossbred (Holstein Friesian×Tharparkar) Bulls

  • Rajak, S.K. (Theriogenology Lab., National Dairy Research Institute) ;
  • Kumaresan, A. (Theriogenology Lab., National Dairy Research Institute) ;
  • Gaurav, M.K. (Livestock Research Centre, National Dairy Research Institute) ;
  • Layek, S.S. (Theriogenology Lab., National Dairy Research Institute) ;
  • Mohanty, T.K. (Livestock Research Centre, National Dairy Research Institute) ;
  • Aslam, M.K. Muhammad (Theriogenology Lab., National Dairy Research Institute) ;
  • Tripathi, U.K. (Theriogenology Lab., National Dairy Research Institute) ;
  • Prasad, Shiv (Livestock Research Centre, National Dairy Research Institute) ;
  • De, S. (Animal Biotechnology Centre, National Dairy Research Institute)
  • Received : 2014.02.24
  • Accepted : 2014.05.19
  • Published : 2014.11.01

Abstract

Present study analyzed the changes in peripheral blood testosterone concentrations and testicular cytogram in relation to age and semen quality in crossbred males. Three different age groups of crossbred males viz. bull calves (6 months, n = 5), young bulls (15 months, n = 5) and adult bulls (4 to 6 years, n = 8) were utilized for the study. Testicular fine needle aspiration cytology technique was used to quantify testicular cytology and their indices. Peripheral blood testosterone concentrations were measured using enzyme-linked immunosorbent assay method. Semen samples collected from adult bulls were microscopically evaluated for quality parameters. Mean peripheral blood testosterone concentrations in bull calves, young bulls and adult bulls were $2.28{\pm}0.09ng/mL$, $1.42{\pm}0.22ng/mL$ and $5.66{\pm}1.08ng/mL$ respectively, and that in adult bulls were significantly different (p<0.01) from young bulls and bull calves. There was no significant difference between the proportion of different testicular cells in bull calves and young bulls. Between young and adult bulls, significant differences (p<0.01) were observed in the proportion of spermatocytes, spermatozoa, and sperm: Sertoli cell ratio. The proportions of Sertoli cells showed a significant difference (p<0.01) between the three age groups. The number of primary spermatocytes had a positive correlation with peripheral blood testosterone concentrations in bull calves (r = 0.719, p<0.01). Number of Sertoli cells per 100 germ cells was negatively correlated with blood testosterone concentration in young bulls (r = -0.713, p<0.01). Among different semen parameters in adult bulls, ejaculate volume (r = 0.790, p<0.05) had positive relationship, and sperm motility had significant negative correlation (r = -0.711, p<0.05) with testosterone concentrations. The number of Sertoli cells and Sertoli cell index had a positive correlation with various semen quality parameters (p<0.001). Results of the present study conclude that number of Sertoli cells and Sertoli cell index are good indicators of semen quality, but peripheral blood testosterone concentrations may not have a direct relationship with various seminal attributes in crossbred bulls.

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