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Acetate Turnover Rate in the Bovine¹

Dairy Science Department, University of Maryland, College Park

ABSTRACT

Data have been obtained on the rate of acetate turnover in a steer and in Holstein cows 2–4 hr after feeding. The turnover rate for mature cows was 2.1 ± 0.5 mM/hr/kg (5.5 ± 1.3 g/hr/cwt). Evidence was obtained from the calculated acetate pool size in relation to blood acetate concentration and from the calculated acetate space that the technique used is measuring the turnover rate of the acetate pool in the accessible central (blood) compartment. The data do not support the concept that the rate of acetate utilization is concentration-dependent, at least for the normal blood concentrations existing in this study. From the data in this study, in relation to various estimates of acetate absorption, it is suggested that as much as 25% of the acetate turned over may be of endogenous origin. Inferences are drawn concerning possible physiological effects on acetate metabolism and the relationship of acetate metabolism to the total metabolic rate.

¹ Scientific Article No. A969, Contribution no. 3350 of the Maryland Agricultural Experiment Station, Dairy Science Department. Supported in part by Agricultural Research Service Regional Project NE-41.

² Present address: Department of Biochemistry, Duke University Medical Center, Durham, North Carolina.