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Metabolic Regulation of Plasma Insulin Levels in Cattle¹

Iowa State University of Science and Technology, Ames 50010

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.

¹ Journal Paper No. J-6784 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project 1790. This work was supported in part by the Iowa State University Research Foundation.

² Department of Animal Science.

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