J. Anim Sci.
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J. Anim Sci. 1966. 25:967-971.
© 1966 American Society of Animal Science
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A Method for Estimating Ether Extract in the Boneless Portion of Lamb Carcasses

A. W. Munson1, J. V. Whiteman and L. E. Walters

Oklahoma Agricultural Experiment Station, Stillwater2

Abstract

Data are presented from the sampling of 60 and 63 ground lamb carcasses in 1963 and 1964, respectively, for the subsequent determination of percent ether extract. The lambs were out of Dorset x western and western ewes and sired by Dorset, Hampshire or Suffolk rams. The average weight of the lambs at slaughter was 46.7 kg., and the range of ether extract was from 20 to 40%.

The boneless portion of each carcass was ground twice and mixed. Eight random 50-gm. "grab samples" were drawn and combined at random into two composite samples. The samples were homogenized using a high speed blender and mixed again after blending. Duplicate subsamples were drawn at random from each composite sample, and percent ether extract was determined. This method of sampling and subsampling permitted the estimation of the magnitude of the components of variance.

The standard errors of estimate were found to be 1.35 and 0.85% for 1963 and 1964, respectively. The 1964 results indicate that, if the above procedure were used, the estimate of ether extract ±0.85% would contain the true value of the lamb 68% of the time.

Estimates of percent ether extract may be improved by increasing the number of "grab samples" per composite sample and by increasing the number of composite samples per lamb. The laboratory technique of sub-sampling the homogenized and mixed lamb and making the determinations accounted for the least amount of the variance, less than 3% in both years.

Footnotes

1 Present address: Biometrical Services, ARS, U.S.D.A., Beltsville, Maryland.

2 Journal Series Paper No. 1221, approved by the Director.

3 Operated in cooperation with Animal Husbandry Research Division, ARS, U.S.D.A.






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Copyright © 1966 by the American Society of Animal Science.