Homeostasisin animals (Sus domesticus) during exposure to a warm environment.

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Abstract
The "stress-susceptible" animals (genetic strain known to have poor heat tolerance), without anesthesia, showed significant increases in heart and respiration rates during the 1st 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 PC02 [CO2 pressure] increased significantly while PO2 [O2 pressure] and pH dropped sharply in these stress-susceptible 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); subsequently, however, the cardiac outputs as well as aortic pressures fell. The "stress-resistant" animals (genetic strain known to have good heat tolerance) showed the capacity to maintain physiological homeostasis, during exposure to a warm environment, with or without anesthesia. The hyperthermic treatment appeared to cause tissue hypoxia in the stress-susceptible animals and represents a phenomena of obvious import to the circulatory and respiratory functions as well as state of myolactosis in the animal. Potassium concentrations and hemoglobin types were not shown to be different as in some animals with hemoglobin which has low oxygen affinity.