J. Anim Sci.
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J. Anim Sci. 1972. 34:952-956.
© 1972 American Society of Animal Science
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Influence of Dietary Protein on the Soluble Collagen of Porcine Skin and Muscle1

R. L. Gilbreath, R. W. Thompson, G. W. Vander Noot and R. F. Elliott2

New Jersey Agricultural Experiment Station, New Brunswick 08903

Abstract

The purpose of this study was to determine the effects of dietary protein on collagen metabolism in swine skin and longissimus muscle. Three groups of sows were fed diets containing either 5, 10 or 15% protein for 30 days prior to parturition. Piglets remained with the sows for 5 weeks with free access to the maternal diet for the final 3 weeks preweaning. At weaning, three groups of five pigs each continued on their preweaning diet, two groups of five pigs each were fed diets with increased protein and two groups of five pigs each were fed decreased dietary protein. All pigs were sacrificed 21 days postweaning. Hydroxyproline was measured to determine collagen concentration and soluble collagen in three fractions (0.5N NaCl, 1.0N NaCl and 0.5N acetic acid) from each tissue. Collagen concentration in skin did not change with diet but in muscle varied inversely with dietary protein level. All three soluble fractions in both tissues increased or decreased as dietary protein was increased or decreased. The percent soluble collagen was greater in the skin in all cases, indicating that skin collagen is metabolically more active than muscle collagen.

Footnotes

1 Paper of the Journal Series, Department of Animal Sciences, Rutgers University, The State University of New Jersey, New Brunswick.

2 Present address: Allied Chemical Corporation, Morristown, N. J. 07960.






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