Abstract

Abstract 1. 1. Turkeys, chickens, great-horned owls and red-tailed hawks were surgically fitted with a cannula in either the glandular stomach (fowl) or muscular stomach (raptors) to permit collection of gastric secretions. 2. 2. After 24 hr of fasting, secretions were collected during three successive periods of no food in sight, food in sight but unavailable and food available. 3. 3. Neither gastric secretory volume nor pH was influenced by the sight of food for domestic turkeys, floor-raised domestic chickens, or red-tailed hawks. 4. 4. Gastric secretory volume increased significantly from 1.08 to 1.47 ml/kg (45-min collection period) when food was in view but unavailable for great-horned owls. 5. 5. Increases in volume and pH which occurred when food was consumed were accounted for by ingestion of food and water, or fluids in the meat eaten by the raptors.

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