J. Anim Sci.
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J. Anim Sci. 1974. 38:38-46.
© 1974 American Society of Animal Science
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Preslaughter Treatment Affecting Intramuscular and Plasma Lipids II. Effect of Marketing, Fasting and Exercise in Beef

John R. Romans1, Horace W. Norton1, Ivan S. Palmer2, Donald R. Wenger3, William J. Costello4, Harold J. Tuma5, Roger Ball6 and Richard C. Wahlstrom4,7,

University of Illinois, Urbana-Champaign 61801 and South Dakota Agricultural Experiment Station, Brookings 57006

Abstract

In trial I, 11 yearling Hereford steers were marketed normally after biopsy of the left longissimus muscle. Symmetrically located right longissimus samples taken 48 hr. later, shortly after slaughter, showed nonsignificant changes in triglyceride (TG), cholesterol (C), phospholipid (PL) and total lipid (TL) content. In trial II, after initial longissimus biopsy and blood samples, eight long-yearling Angus and Hereford steers were exercised alternate hours during the final 10 hr. of a 31-hr. fast before slaughter. Plasma FFA were elevated during fasting and exercise compared to literature values. There were significant regressions of plasma characters on time of sedentary fasting, as follows: cubics for TG (P<.01) and C (P<.05) and quadratics (P<.05) for PL and TL. Also there was a significant quadratic (P<.01) regression of TG on time of exercise fasting. Plasma cholesteryl esters (CE) remained high and stable throughout the entire fasting and exercise period. Muscle samples taken at slaughter showed significant (P<.01) increases in FFA and PL and nonsignificant increases in TG, C and TL compared to biopsy samples, 36 of 40 changes being positive. Thus preslaughter exercise and fasting did not reduce intramuscular lipids.

Footnotes

1 Department of Animal Science, University of Illinois.

2 Department of Station Biochemistry, South Dakota State University.

3 Present address: U.S. Department of Agriculture Animal Disease Laboratory, Ames, Iowa 50010.

4 Department of Animal Science, South Dakota State University.

5 Present address: Department of Animal Science, Kansas State University, Manhattan 66502.

6 Present address: King B Packing Company, Idaho Falls, Idaho 83401.

7 The authors express gratitude to Armour & Company, Huron, South Dakota for assistance in collection of data and to Rebecca M. Krusemark for technical assistance.






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Copyright © 1974 by the American Society of Animal Science.