Homeostasis in animals (Sus domesticus) during exposure to a warm environmenP2

.~KD E. J. BRISKEY. Homeostasis in animals (Sus domesticus) during exposure to a warm environment. J. Appl. Physiol. 24(l): 33-39. 1968.-The “stress-susceptible ” animals (genetic strain known to have poor heat tolerance), without anesthesia, showed significant increases in heart and respiration rates dur-ing the first 10 min of exposure to a warm environment, after which there were marked reductions in heart rates and sharp declines in respiration rates. Venous blood PCO ~ increased signif-icantly while Poq and pH dropped sharply in these stress-sus-ceptible animals. Immediately after exsanguination the skeletal musculature had a low pH and high degree of myolactosis. Esophageal temperatures and cardiac outputs increased initially in the stress-susceptible animals (anesthetized) ; sub-scqucntly, however, the cardiac outputs as well as aortic pressures fell. The ‘?tress-resistant ” animals (genetic strai