Metabolic Regulation of Plasma Insulin Levels in Cattle

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Abstract
The mean plasma insulin levels in four heifers were 0.5 ng/ml before feeding, 0.7 ng/ml during the 6-hr. period after feeding and 0.2 ng/ml during 46- to 58-hr. period after feeding. Plasma insulin levels were not closely related to plasma glucose concentrations after feeding or after 46 to 58 hr. of fasting. Intravenous infusion of glucose (0.5 mmole/hr./kg), propionate (0.5 mmole/hr./kg) or butyrate (0.25 mmole/hr./kg) each increased plasma insulin levels in steers fasted for 24 hours. The greatest responses were observed with propionate and butyrate. Intravenous administration of amino acids (arginine and hydrolyzed casein) increased plasma insulin levels much more than could be accounted for by the gluconeogenic effects of the amino acids. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.

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