author(s)
A Sihag, SS Singhal, Sunita and N Kataria

abstract
Present investigation was envisaged to find out extreme ambient temperature association variation in plasma antioxidants and free radical scavenging enzymes in buffalo calves from arid tracts. The antioxidants selected were Vitamin A and Vitamin E and free radical scavenging enzymes was Catalase. The moderate (control) mean values of vitamin A and Vitamin E in plasma were 2.08±0.01µmolL-1, 4.69±0.02 µmol L-1, respectively. The mean values of vitamin A and vitamin E were 1.18 and 1.7 times lower in plasma, respectively during extreme hot ambience than respective moderate ambience mean values. The moderate (control) mean values of catalase in plasma were 71.81±1.11kU L -1. The plasma mean values was 1.43 times higher during extreme hot ambience than respective moderate ambience mean values. It could be concluded that variation in plasma antioxidants and free radical scavenging enzymes were associated with changes in ambient temperatures. On the basis of result it can be recommended that buffalo calves should be protected from the heat stress to maintain integrity of erythrocytes and the body as a whole.