J. Anim Sci.
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J. Anim Sci. 1976. 42:565-568.
© 1976 American Society of Animal Science
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Effect of Slaughter Location and Quality Factors on Beef Quality Grades1

D. R. Maxwell2, M. P. Hoffman3, D. G. Topel3 and H. L. Self3,4,

Iowa State University, Ames 50010

Abstract

Carcasses of "A" maturity from 3,182 yearling steers were used to assess the influence of quality factors and slaughter location-trial and (or) graders upon final quality grade. These steers were part of a study involving 16 trials (eight summer and eight winter) concerned with housing and feeding systems for feedlot cattle under northwest Iowa conditions.

Marbling score was the primary factor determining final quality grade with a standard partial regression coefficient of .82 (P<.01), while the remaining quality factors had standard partial regression coefficients of .12 (P<.01) for conformation, .08 (P<.01) for color of lean, .04 (P<.01) for texture of lean, .03 (P<.01) for firmness of lean, and –.02 (P<.05) for texture of marbling.

When slaughter location-trial was included in a model with the quality factors, 14% of the total variation in final quality grade could be explained by slaughter location-trial and 71% by slaughter location-trial and marbling. With the addition of the remaining quality factors 87% of the total variation was accountable.

Footnotes

1 Journal Paper No. 8090 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 1801.

2 Present address: McNay Experiment Farm, Rt. 1, Derby, Iowa 50068.

3 Department of Animal Science.

4 The authors acknowledge the assistance of P. J. Berger in the statistical analysis.






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Copyright © 1976 by the American Society of Animal Science.