Effects of heat stress on Na+,K+‐ATPase, Mg2+‐activated ATPase, and Na+‐ATPase activities of broiler chickens vital organs

Na+,K+‐ATPase, Mg2+‐activated ATPase, and Na+‐ATPase activities of brain, heart, kidney, and small and large intestinal mucosa of broiler chickens exposed to heat stress (41°C, 65% relative humidity for 6 h) and thermoneutral (25°C, 65% relative humidity) conditions were determined. Brain and kidneys were found to have significantly higher Na+,K+‐AJPase activities than those of heart and intestinal mucosa. Mg2+‐activated ATPase and Na+‐ATPase activities in the intestinal mucosa were higher than those of brain, kidneys, and heart under thermoneutral conditions. While there was a significant inhibition of total ATPase, Na+,K+‐ATPase, Mg2+‐activated ATPase, and Na+‐ATPase activity of small and large intestinal mucosa of broiler chickens exposed to heat stress, the inhibitory effect was limited to total ATPase and Na+,K+‐ATPase enzymes in kidneys. Heat stress produced a significant increase only in Mg2+‐activated ATPase activity of the heart, without a remarkable change in all forms of ATPase activity in the ...