J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 1971. 32:1119-1123.
© 1971 American Society of Animal Science
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Weiss, G. M.
Right arrow Articles by Christian, L. L.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Weiss, G. M.
Right arrow Articles by Christian, L. L.

I. Relationship between Muscle Quality and Quantity, Plasma Lactate and 17-Hydroxy- Corticosteroids1

G. M. Weiss, D. G. Topel, R. C. Ewan, R. E. Rust and L. L. Christian2

Iowa State University, Ames 50010

Abstract

Forty-four Poland China barrows, 22 from a lean strain and 22 from a fat strain were slaughtered at designated weight endpoints of 1, 4, 9, 18, 41, 63, 91, 114 and 137 kg live weight. Carcass dissection and proximate analysis showed selection for muscling resulted in increased muscle and protein deposition that decreased as weight increased. Total fat deposition was significantly greater in the fat strain and increased significantly in both strains as body weight increased. Intermuscular fat deposition increased at a faster rate in the lean strains with increasing weight to 91 kilograms. Percent body moisture decreased as weight increased in both strains. Leans train pigs possessed lighter colored M. longissimus muscle than the fat strain pigs, and a significant weight response was obtained with 1, 114 and 137 kg weight pigs possessing lighter colored muscle. Blood pH declined with increasing weight, and 17-OHCS levels also decreased with the lean-strain pigs possessing significantly higher levels of 17-OHCS. Serum and muscle lactate increased with increasing weight. Evidently, genetic selection for the meat-type pig has influenced metabolic and hormonal functions, which directly or indirectly influenced quantitative and qualitative characteristics.

Footnotes

1 Journal Paper No. J-6679 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No.1697.

2 The authors wish to express their appreciation to Dr. D. F. Cox for his assistance on the statistical analysis.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1971 by the American Society of Animal Science.