Effect of Feeding, Fasting and Infusion of Energy Substrates on Plasma Growth Hormone Levels in Cattle

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Abstract
The mean plasma growth hormone levels in four 5-month-old heifers were 12.8 Ng/ml before feeding, 11.0 Ng/ml during the 6-hr, period after feeding and 10.6 Ng/ml 46 to 58 hr. after feeding. No evidence was obtained to indicate that fasting alone was a stimulus to growth hormone secretion in cattle. Infusion of acetate, propionate or butyrate did not alter plasma levels of growth hormone. Inhibition of glucose metabolism with 2-deoxy-glucose did not change plasma levels of the hormone. A greater growth hormone secretory response to infusion of arginine occurred in fasted heifers as compared with fed heifers. Repeated measurement of plasma growth hormone levels during two 12-hr, periods in four heifers indicated that there was considerable variation in plasma levels within animals that were not related to changes in plasma glucose or the environment. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.

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