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Pregastric Esterase in Milk Sham Fed to Adult Jersey Steers^1,2,

Department of Animal Science, North Carolina State University, Raleigh 27607

ABSTRACT

Pregastric esterase activity was detected in reconstituted nonfat milk sham fed from a nipple pail to two 4-yr-old rumen-fistulated steers. Lipolytic activity, determined in a medium containing 5% tri-n-butyrin, averaged 8.6 ± .4 lipase units. Further assays, in which activity was measured by free fatty acids released from a condensed milk substrate, averaged 166.9 ± 9.2 µmol. These values are higher than those noted for young calves, indicating that secretion of pregastric esterase may persist in cattle beyond calfhood. Esterase activity in one of the steers fed whole milk until he was 2 yr of age showed no marked residual effect of earlier intake of milk fat.

¹ Paper No. 4471 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, NC. Use of trade names in this publication does not imply endorsement of the products mentioned.

² Supported in part by the North Carolina Dairy Foundation.