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Dietary effects on beef composition: III. Weight, composition and potassium–40 content of fat-free muscles*

Published online by Cambridge University Press:  27 March 2009

M. D. Judge ,
N. L. Firth ,
H. R. Johnson ,
W. V. Kessler ,
R. B. Harrington  and
R. R. Garrigus
M. D. Judge
Affiliation:
Departments of Animal Sciences and Bionucleonics, Purdue University, Lafayette, Indiana 47907
N. L. Firth
Affiliation:
Departments of Animal Sciences and Bionucleonics, Purdue University, Lafayette, Indiana 47907
H. R. Johnson
Affiliation:
Departments of Animal Sciences and Bionucleonics, Purdue University, Lafayette, Indiana 47907
W. V. Kessler
Affiliation:
Departments of Animal Sciences and Bionucleonics, Purdue University, Lafayette, Indiana 47907
R. B. Harrington
Affiliation:
Departments of Animal Sciences and Bionucleonics, Purdue University, Lafayette, Indiana 47907
R. R. Garrigus
Affiliation:
Departments of Animal Sciences and Bionucleonics, Purdue University, Lafayette, Indiana 47907
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Summary

The effects of several dietary regimens on the fat-free mass and the dry-matter, ash and potassium-40 content of selected bovine muscles were estimated. Muscle data from 104 half-sib Angus steers were secured at several stages of growth and after several feeding regimens. The results indicated that a hay diet, by comparison to a higher energy silage diet in the early feeding period (216–340 kg live weight), suppressed the fat-free weight, reduced the dry-matter content and increased the ash content of several muscles. These effects of early diet were reversed, however, when the animals were subsequently fed higher-energy rations and slaughtered at heavier weights (409 and 454 kg live weight). Data on potassium-40 gamma emissions by composite muscle samples confirmed the existence of age- or weight-associated decreases and suggested possible dietary influences on potassium levels in bovine muscles. The trends in these data indicated that low dietary energy (hay feeding) in the early feeding period delayed the decline in muscle potassium that normally accompanies maturation.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 72 , Issue 2 , April 1969 , pp. 303 - 309
Copyright
Copyright © Cambridge University Press 1969

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References

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