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Pyruvate Metabolism in the Dairy Calf^{1, 2,}

Department of Animal Husbandry University of California, Davis

ABSTRACT

Two male Jersey calves were used in pilot trials to evaluate procedures for a study of pyruvate metabolism. One calf was fed a high-carbohydrate diet composed of dried skimmilk, 34%; dried whey, 28%; cerelose, 38%; a supplementary salt mix; and vitamins A and D (2). The other was fed whole milk containing 3.5% fat. The calves were isolated in individual pens and fed the experimental diets for seven and ten days, respectively, after which about one-half millieuries sodium pyruvate-2-C¹⁴, dissolved in saline, was injected into each calf through a venous catheter.

A respiration apparatus (8), fitted with a face mask similar to that used by Kleiber and Edick (5), was used to collect carbon dioxide samples by absorption in NaOH. The Na₂CO³ was collected at approximately 3-min intervals for 3 hr after administration of the isotope. Total CO₂ production was calculated from the average CO₂ concentration in the respired air during each 3-hr trial.

¹ Supported in part by Grant Number AM-05745-02, National Institute of Arthritis and Metabolic Disease, Public Health Service; and by National Institutes of Health Predoctoral Research Fellowship 1-F1-GM-17660-01A1.

² Data from a thesis submitted by the senior author in partial fulfillment of requirements for the Doctor of Philosophy degree.