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Journal of Dairy Science Vol. 70 No. 2 277-283
© 1987 by American Dairy Science Association ®
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Response of Insulin, Glucagon, and Growth Hormone to Intravenous Glucose Challenge in Cows Fed High Fat Diets1

K. A. Cummins

Department of Animal and Dairy Sciences, Alabama Agriculture Experiment Station, College of Agriculture

J. L. Sartin

Departments of Veterinary Physiology and Pharmacology and Animal Health Research, Alabama Agriculture Experiment Station, College of Veterinary Medicine, Auburn University 36849

ABSTRACT

Effect of feeding high fat diets on peripheral plasma concentrations of immunoreactive insulin, glucagon, and growth hormone following intravenous glucose challenge (100 mg D-glucose/kg body weight) at 50 and 100 d of lactation in 16 multiparous Holstein cows was evaluated. The high fat diet contained 18.5% whole cottonseed on a dry matter basis as the source of extra dietary fat. Feeding the high fat diet had no apparent effect on energy balance. Basal plasma insulin and insulin:glucagon ratio were increased in cows fed the high fat diet relative to those of controls. Glucagon, insulin, and insulin:glucagon ratio response to glucose challenge were not affected by diet. Response of growth hormone to glucose challenge at 50 d of lactation was depressed in cows fed the high fat diet. Plasma glucose peaked at greater concentrations in cows fed the high fat diet. Feeding a high fat diet to dairy cows appears to increase basal insulin concentration and insulin:glucagon ratio, which has actions opposed to glucose synthesis. Thus, endocrine effects of a high fat diet appear to favor decreased milk production.

FOOTNOTES

1 Journal Article Number 4-85934, Alabama Agriculture Experiment Station. Approved by the Director for publication.






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Copyright © 1987 by the American Dairy Science Association ®.