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Journal of Dairy Science Vol. 54 No. 2 258-261
© 1971 by American Dairy Science Association ®
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Effect of Fat Source on Relative Activity of Pregastric Esterase and on Gleceride Composition of Intestinal Contents1,2,

K. L. Siewert3 and D. E. Otterby

Department of Animal Science, University of Minnesota, St. Paul 55101

ABSTRACT

Sham-fed nonfat milk was incubated with filled milks containing 8% of various fats and oils. When related to evaporated milk (7.9% fat, relative activity 100), activities for butteroil, colostrum fat, coconut fat, choice white pork grease, refined lard, tallow, soybean oil, and corn oil were 87.3, 87.2, 70.8, 28.5, 14.1, 14.2, 22.9 and 18.1.

In a second study, residual glycerides in various sections of the gastrointestinal tract of seven-day old calves were examined after milk replacers containing lard or milk fat were fed. Significantly greater proportions of triglycerides were in contents of the abomasum, descending and ascending duodenum, and first 2 m of jejunum of calves fed lard-filled milks than of calves fed milk fat-filled milks. Abomasal diglyceride and monoglyceride fractions were lower (P < 0.01) for calves fed lard-filled milk than for calves receiving milk fat-filled milk; however, by the time intestinal contents reached the jejunum, only monoglycerides were significantly lower (P < 0.05).

FOOTNOTES

1 Paper 7364. Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul.

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

3 NDEA Fellow, Title IV.






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Copyright © 1971 by the American Dairy Science Association ®.