Year: 2015 | Month: June | Volume 5 | Issue 2
Polymorphic Sperm Phenotype Suggesting Genetic Sperm Defects in a Jersey (Bos taurus) X Zebu (Bos indicus) Crossbred Bull
Abstract:
Data 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.
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