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Journal of Dairy Science Vol. 47 No. 12 1371-1377
© 1964 by American Dairy Science Association ®
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Glucose Metabolism in Dairy Cattle and the Effect of Acetate Infusion1

H. H. Head, J. D. Connolly and W. F. Williams

Department of Dairy Science, University of Maryland, College Park

ABSTRACT

Glucose turnover rate, glucose pool size, and glucose space were determined in three nonlactating Holstein cows 2–4 hr after feeding, using two isotope dilution techniques. Turnover rates obtained by the single injection and constant infusion methods were 1.46 and 1.12 mg/min/kg body wt, respectively. The mean pool size, when expressed on a unit weight basis (mg/kg body wt), and mean turnover rate were significantly higher (P < 0.05) as determined by the single injection procedure. Comparison of the ruminant turnover rate data to nonruminant data lends further support to the contention that glucose is quantitatively less important in ruminant metabolism. Evidence of diminished glucose utilization was obtained during the intravenous infusion of unlabeled acetate (approximately 1 Mol/hr). Glucose turnover rates obtained during acetate infusion were only 75 and 79% of the preinfusion rates. These data are interpreted as suggesting the preferential utilization of acetate by the peripheral tissues during intervals of increased acetate availability.

FOOTNOTES

1 Scientific Article no. A-1138, Contribution no. 3600 of the Maryland Agricultural Experiment Station, Department of Dairy Science.

2 Present address: Department of Dairy Science, University of Florida, Gainesville, Florida.

3 Present address: Laboratory of Experimental Metabolic Diseases, Veterans Administration Hospital, Long Beach, California.






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Copyright © 1964 by the American Dairy Science Association ®.