Invitro Effect of Zinc Treatment on the Antioxidant Status of Heat Stressed Peripheral Blood Mononuclear Cells of Periparturient Sahiwal and Karan Fries Cows - A Comparative Study

The current study was undertaken to evaluate the invitro effect of zinc treatment on the Superoxide Dismutase (SOD) and Catalase status in the heat stressed Peripheral Blood Mononuclear Cells (PBMC) of periparturient indigenous and crossbred cows. Twelve pregnant cows, six each from Sahiwal and Karan Fries in their second parity were selected for the experiment. Blood samples were collected at −21, 0 and +21 days with respect to calving from each animal. The 48 hour long cultured PBMC were exposed to three levels of treatment viz., 37°C, 42°C to induce thermal stress and 42°C+Zinc to minimize the effect of high temperature. SOD and Catalase showed a significant (P<0.05) difference between the two breeds, more concentration being found in Karan Fries. While comparing the days, the concentration of both SOD and Catalase was found to be more on the day of calving though non-significantly in case of SOD but the difference was significant (P<0.05) vis-à-vis Catalase. Zinc treatment caused a decreased production of both SOD and Catalase which were otherwise increased due to thermal stress. The antioxidant concentration was highest due to thermal stress in Karan Fries on the day of calving. The oxidative stress supervenes during peripartum and heat stress which could be alleviated by zinc treatment.