J. Anim Sci.
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J. Anim Sci. 1984. 58:787-791.
© 1984 American Society of Animal Science
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Frame Score and Fat Probe for Predicting Compositional Characteristics of Young Beef Bulls1

R. Wayne Williams2 and Curtiss M. Bailey3,4

University of Nevada, Reno 89557

3 To whom reprint request should be addressed.

Abstract

Relationships among frame score, fat probe, live weight, weight/height and compositional characteristics of young beef bulls (N=249) were evaluated. Significant, positive correlation coefficients were observed between frame score and longissimus area, edible cuts and edible cuts/day of age. Precentage of fat in the carcass and carcass grade were negatively correlated with frame score. There were significant, negative associations between fat probe measurements and cutability; however, relationships of fat probe with yield of edible cuts were not significant. Correlations of weight/height with carcass fat thickness were comparable to, or exceeded, correlations between fat probe and actual subcutaneous fat thickness at the 12th rib. Animal weight just before slaughter was the most useful indicator of edible cuts and edible cuts/day. Multiple correlations from analyses in which all four live animal measures were included as independent variables were of the order of .8 to .9 for these two traits. Only a slight reduction in accuracy occurred when all variables except slaughter weight were deleted from the prediction equations. Precision of estimates for other carcass end points was too low to warrant commercial application of these procedures. The use of frame score or live fat probe to estimate composition of young beef bulls is not recommended.

Footnotes

1 Contribution of Nevada Agr. Exp. Sta., Journal Series No. 570.

2 Current address: Star Rt. 2, Box 17,Hugo, CO 80821.

4 The authors express appreciation to Edward Dunn, Meats Laboratory, Don Albert, Livestock Manager and J. Michael Colbert, for technical assistance.






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Copyright © 1984 by the American Society of Animal Science.