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Effects of Long-term Heat Exposure on Adaptive Mechanism of Blood Acid-base in Buffalo Calves
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 Title & Authors
Effects of Long-term Heat Exposure on Adaptive Mechanism of Blood Acid-base in Buffalo Calves
Korde, J.P.; Singh, G.; Varshney, V.P.; Shukla, D.C.;
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In order to investigate the mechanism of adaptation to long-term heat stress, six female buffalo calves of about 7 to 8 months age, were exposed to the cool-comfort environment (THI 65) for 21 days to obtain normal values of blood acid-base. An adaptive response of acid-base regulation was determined to long term (21 days) exposure of buffalo calves to hot-dry (THI 80) and hot-humid (THI 84) conditions. Higher rectal temperature and respiratory rate was recorded under hot-humid exposure compared to hot-dry. Significant reduction in the rectal temperature and respiratory rate on day 21 of hot-dry exposure indicated early thermal adaptation compared to hot-humid. Decreasing rectal temperature and respiratory rate from day 1 to 21 was associated with concurrent decrease in blood pH and pCO2. Increased plasma chloride concentration with low base excess in blood and in extracellular fluid suggested compensatory response to respiratory alkalosis. Reduced fractional excretion of sodium with increased fractional excretion of potassium and urine flow rate indicated renal adaptive response to heat stress.
Blood Acid-base;Fractional Excretion;Renal Clearance;Long-term Heat Stress;Buffalo Calves;
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