Abstract
Saluki dogs, exposed to temperatures increasing from 25 to 47 C, demonstrated respiratory alkalosis, with pH increasing from 7.391 ± 0.004 to 7.507 ± 0.014, and $P_{a}CO_{2}$ (arterial CO₂ partial pressure) decreasing from 30.4 ± 0.9 to 16.3 ± 0.9 torr. Metabolic compensation, with HCO⁻₃ decreasing from 18.4 ± 0.4 to 12.7 ± 0.4 meq/liter, prevented a greater increase in pH. Serum metabolites and enzymes indicated increased gluconeogenesis in the heat and could explain the improved metabolic (i.e., nonrespiratory) compensation seen in the Saluki. Thyroid hormones were unchanged in the heat, but the hypothyroid levels in the Saluki support the role of the thyroid in adaptation to heat tolerance. The data suggest that the Saluki are excellently suited to tolerating conditions of high temperature and that buffer mechanisms are well adapted for the reduction of respiratory alkalosis.
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