Abstract
The present study was aimed to assess the seasonal variation in glutathione peroxidase (GPx) in seminal plasma of Karan Fries (Tharparkar x Holstein Friesian) bulls. Weekly ejaculates were collected by artificial vagina (42–45°C) during winter (December to mid February), spring (mid February-April), hot dry (May-June) and hot humid (July-August) seasons. Higher concentration of GPx was observed during hot humid season (65.74+0.93 pg mL1) than in winter (59.30+ 0.60 pg mL1), spring (60.67+0.76 pg mL1) and hot dry (62.14+0.90 pg mL1) seasons. The percentage of live spermatozoa decreased during hot humid season as compared to other seasons. The acrosomal integrity also decreased during hot dry (78.7+0.6%) and hot humid (74.2 +0.6%) seasons as compared to winter (83.1+0.6%) and spring (83.4+0.5%) seasons. The supplementation of antioxidant appears essential to Karan Fries bulls during summer season under tropical climatic conditions.
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