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Glucose Utilization and Contribution to Milk Components in Lactating Ponies¹

Kansas State University,² Manhattan 66506

Abstract

Plasma glucose turnover and its contribution to milk components were studied in three lactating mares by primed-infusion using glucose uniformly labeled with ¹⁴C. The mares were milked by hand during the 4- to 5-hr infusion period. Glucose turnover (4.46 mg min^–1kg^–1) was 2.8 times higher than previously reported for nonlactating mares. Forty percent (mean) of the infused radioactivity appeared in the milk. More than 90% of the radioactivity in milk was in lactose. Transfer quotients for lactose and casein were .98 and .06, respectively. The results indicated that almost all of the lactose carbon came from plasma glucose carbon and that milk composition accounted for 40% of the glucose turnover in lactating mares.

¹ Contribution No. 145 from Kansas Agricultural Experiment Station. Supported in part by U. S. Public Health Service grants AM11384 and PRO5619.

² Department of Physiological Sciences.