J. Anim Sci.
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J. Anim Sci. 1944. 3:224-232.
© 1944 American Society of Animal Science
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The Relationship of Feeder Grade, Initial Weight, Total Gain, Finished Grade, and Carcass Grade of Lambs1

Leslie E. Johnson2

South Dakota Agricultural Experiment Station

Abstract

  1. The correlations and regressions between initial weight, feeder grade, total gain, finished grade, B.A.E. carcass grade, and packer carcass grade were measured on several thousand lambs. All these statistics were computed on an intra-lot basis.
  2. With all lambs marketed at one time, initial weight, feeder grade, finished grade, and B.A.E. carcass grade showed considerable relationship, the correlation coefficients varying from 0.35 to 0.54. Packer carcass grades were only slightly related with any of these other measurements.
  3. Marketing the lambs as they finished resulted in decreasing the number of very light and overweight carcasses and, in general, reduced slightly the advantage of greater initial weight and superior feeder grade.
  4. The use of more than one of the measures studied in estimating gain, finished grade, and carcass grade of lambs did not appear practical although slightly more accurate estimates of each were secured.
  5. The average rating of lambs increased approximately one grade during fattening. In general, "Good" feeder lambs graded "Choice" when finished and dressed out "Choice" carcasses.
  6. Standardization and acceptance of lamb carcass grades on the basis of value and the use of such standard in the daily purchase of live animals seems desirable. An investigation should also be made of the relationship between profit and grade in lambs as it applies to the breeder, feeder, and packer.

Footnotes

1 Approved for publication by the Director of The South Dakota Agricultural Experiment Station as Journal Series No. 184.

2 >Acknowledgement is made to D. A. Spencer of the U.S. Bureau of Animal Industry for suggestions in interpretation of results.






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Copyright © 1944 by the American Society of Animal Science.