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ThesisItem Open Access A STUDY ON SOME OXIDATIVE-STRESS AND ANTIOXIDANT MARKERS IN PUNGANUR CATTLE DURING DIFFERENT SEASONS(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2021-05) SHALOME, SANDRAPATI; ASWANI KUMAR, K (MAJOR); ESWARA PRASAD, P; SRINIVASA PRASAD, CHZebu cattle are reported to be more heat tolerant than crossbred cattle. It is hypothesised that the oxidative status of zebu and crossbred cattle might be compromised differentially to heat stress. Environmental conditions vary significantly during different seasons in tropical climate. The present study was conducted in three different seasons, (summer, Monsoon and winter) in sixty (60) apparently healthy Punganur cattle aged 2 years and above, maintained at Livestock Research Station, SVVU, Palamaner, Chittoor with an objective to assess changes in different markers of oxidative stress, HSP 70 and associated hormones. The mean THI values in the present study were observed to be significantly (p<0.05) higher during summer (79.03±1.22) than monsoon (70.93±1.17). The mean concentrations of glucose values (mg/dl) in males, females and total herd in the present study were significantly low in summer compared to monsoon and winter. Heat stressed cows become hypersensitive to insulin, and will reduce or block adipose mobilization and increasing glucose ‘burning’ in an attempt to minimize metabolic heat production The mean values of TBARS, Catalase (CAT), Superoxide dismutase (SOD) and Glutathione peroxidase (GPx) in males, females and total herd were found to be significantly (P<0.05) higher in summer season compared to monsoon and winter. The activity of Glutathione-S-Transferase in males, females and total herd was found to be insignificant in all the three seasons that were studied. The reduced glutathione values in males, females and total herd were found to be significantly higher in summer (P<0.05) compared to monsoon and winter. The concentration of serum Heat Shock Protein 70 (HSP 70) in males, females and total herd were significantly (p<0.05) higher in summer compared to monsoon and winter, indicating Cellular response of the animals to stressors. The mean concentration values of serum cortisol in males, females and total herd of Punganur cattle were significantly (p<0.05) higher in summer compared to monsoon and winter. Serum triiodothyronine (T3) and Thyroxine (T4) activity in males, females and total herd of Punganur cattle showed a significantly lower (p<0.05) levels in summer compared to monsoon and winter. The trends of T3 and T4 hormones in the present study during different seasons indicates the altered metabolism during different seasons.
