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Journal of Dairy Science Vol. 54 No. 10 1436-1448
© 1971 by American Dairy Science Association ®
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Ultrastructural Aspects of Lipid Absorption by Bovine Intestinal Mucosa1

P. R. Sterzing2, A. D. McGilliard and R. S. Allen3

Department of Animal Science and Department of Biochemistry and Biophysics Iowa State University, Ames 50010

ABSTRACT

Ultrastructural aspects of lipid absorption by the small intestinal mucosa of the ruminating and nonruminating bovine were investigated. Jejunal biopsies were obtained with a hydraulically-operated suction biopsy tube passed internally via a duodenal cannula. Biopsies excised from fasted animals were controls or were incubated in vitro for different time periods. In-vivo absorption was studied after introduction of emulsified lipid directly into the small intestine.

During in-vivo absorption, epithelial cells contained circular profiles (lipid droplets) individually in the apical cytoplasm and as aggregates in the Golgi apparatus and intercellular spaces. A similar pattern was observed after exposure of biopsies in vitro to micellar solutions of oleic acid, monoolein, and sodium taurodeoxycholate, except that aggregates were not distinct in the Golgi region and were absent intercellularly. These results suggest that the integrity of the small intestine is a requisite for transport but not for movement into the cell.

FOOTNOTES

1 Journal Paper 5-6878 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project 1324. Supportecl in part by funds provided by Grant HE-04969, Department of Health, Education and Welfare.

2 Present address: The Hornlell Institute, Austin, Minnesota 55912.

3 Present address: Department of Biochemistry, Louisiana State University, Baton Rouge 70803.






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Copyright © 1971 by the American Dairy Science Association ®.