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Role of Pregastric Esterase in the Abomasal Hydrolysis of Milk Fat in the Young Calf^{1, 2,}

Animal Nutrition Section, Department of Animal Industry, North Carolina State College, Raleigh

ABSTRACT

The hydrolysis of milk fat in the abomasum of the young calf was studied. Whole milk either was nipple-fed (oral feeding) or was placed directly into the abomasum (abomasal feeding). The purpose of the latter system was to minimize the entrance of pregastric esterase. At 1, 2, and 3 hr. after feeding, the contents of the abomasum were sampled and analyzed for total free fatty acids (FFA). The FFA from the oral-fed samples were also separated into three fractions: butyric, valeric, and higher fatty acids. The mean concentrations of total FFA (µM/5 g. contents) were as follows for the oral and abomasal systems of feeding, respectively: 1 hr., 86, 19; 2 hr., 101, 20; and 3 hr., 120, 30. For the oral-fed samples, the mean concentrations of butyric, valeric, and higher fatty acids were as follows, respectively: 1 hr., 34, 7, 53; 2 hr., 19, 4, 77; and 3 hr., 11, 3, 119.

¹ Contribution from the Animal Industry Department, North Carolina Agricultural Experiment Station, Raleigh, North Carolina. Published with the approval of the Director of Research as Paper No. 1358 of the Journal Series.

² This investigation was supported in part by a research grant, A-2230, from the National Institute of Arthritis and Metabolic Diseases, Public Health Service.

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