Browsing by Author "Gopinathan, Alagappan"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
ArticleItem Open Access Influence of Non-Genetic Factors on Semen Quality Parameters in Crossbred Jersey (Bos taurus x Bos indicus) Bulls(2018) Gopinathan, Alagappan; Sivaselvam, Salem Nagalingam; Karthickeyan, Sarojini Kanniappan; Venkataramanan, Ragothaman; TANUVASData on 106197 semen ejaculates of 310 crossbred Jersey bulls maintained at three frozen semen stations in Tamil Nadu, India were collected from the year 2002 to 2014. The effects of various non-genetic factors such as farm, ejaculate number, period of semen collection, season of semen collection and age of the bulls at collection were studied on semen quality parameters using least-squares method. The overall least-squares means for semen volume, sperm concentration, mass activity, initial sperm motility, post-thaw motility and number of doses per ejaculate were 4.03 ml, 1056.18 million per ml, 2.31, 67.08 per cent, 51.04 per cent and 172.58 doses, respectively. The effects of farm, ejaculate, period and age of the bulls were significant (P<0.05) on all semen quality parameters. Season had significant (P<0.05) effect on sperm concentration, mass activity and initial sperm motility. The farm x season and age x ejaculate interaction effects were found to have significant (P<0.05) effect on all semen quality parameters.ArticleItem Open Access Polymorphic Sperm Phenotype Suggesting Genetic Sperm Defects in a Jersey (Bos taurus) X Zebu (Bos indicus) Crossbred Bull(TANUVAS, 2015-06) Madurantakam, N. Sundararaman; Gopinathan, Alagappan; Subramanian, Arunachalam; TANUVASData on semen collections from a Jersey X Zebu crossbred bull, consistently producing semen with high proportion of sperm abnormalities was collected and the semen characteristics were analyzed. Observation of the records of 58 ejaculations from the bull has revealed that 96.6% of the ejaculates were rejected for poor semen quality especially in sperm morphology. A representative semen sample from the bull also showed sperm abnormalities up to 72.9%, of which 14.9% and 14.5% of the spermatozoa exhibited loose heads and microcephalic heads respectively. Coiled tail (16.7%) and short tail (14.9%) were the main tail defects observed. Since sperm defects were consistently appearing in high proportions in almost all the ejaculates the genetic cause of the sperm defect was suspected.