J. Anim Sci.
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J. Anim Sci. 1981. 52:764-768.
© 1981 American Society of Animal Science
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Evaluation of Adjusted Net 40 K Count as a Predictor of Muscle Mass in Yearling Beef Bulls1

G. R. Rider2, L. E. Walters, R. R. Frahm, R. D. Morrison, R. W. McNew and B. W. Lambert

Oklahoma Agricultural Experiment Station, Stillwater 74078

Abstract

Twenty-five Hereford and 22 Angus yearling bulls were fed to randomly preassigned weights ranging from 432 to 591 kg for counting in a 40 K whole-body counter. Each bull was counted twice following a 24-hr shrink and subsequently slaughtered. Wholesale cuts of the right side of each carcass were separated into closely trimmed lean, fat and bone. "Thick" muscle systems were closely trimmed. "Thin" muscle systems were ground, sampled and analyzed for fat by a modified Babcock procedure. Fat measured by this procedure was subtracted from closely trimmed "thin" muscle, and the remainder plus "thick" muscle were added together as the measure of carcass lean. Carcass lean for the 47 bulls averaged 171.5 kg with a standard deviation of 13.3 kilograms. Standard errors of estimate for predicted carcass lean were 8.7 kg, when weight was used as the independent variable, and 10.3 kg, when adjusted net count was used. Prediction equations utilizing adjusted net count and weight had a standard error of estimate of 5 kg and accounted for 86.3% of the variation in carcass lean. The adjustment for background depression reduced the error in predicting carcass lean by .6 kilograms.

Footnotes

1 Journal Article No. 3720 of the Oklahoma Agr. Exp. Sta., Oklahoma State Univ., Stillwater 74078.

2 Present address: John Morrell & Co., 110 Beefro, Box 9356, Amarillo, TX 79105.






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Copyright © 1981 by the American Society of Animal Science.