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Quantitative estimates of lamb carcass composition 3. Carcass measurements and a comparison of the predictive efficiency of sample joint composition, carcass specific gravity determinations and carcass measurements

Published online by Cambridge University Press:  02 September 2010

V. M. Timon  and
Maurice Bichard
V. M. Timon
Affiliation:
School of Agriculture, University of Newcastle-upon-Tyne
Maurice Bichard
Affiliation:
School of Agriculture, University of Newcastle-upon-Tyne
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Summary

Interrelationships between carcass measurements were studied in 83 purebred Clun Forest lambs slaughtered at approximately 80 lb. live-weight and ranging in carcass weight from 29 to 42 lb. Individual carcass measurements did not have a worthwhile predictive value; apart from loin (C) and rib (J) fat depths none of 12 external or internal carcass measurements showed a correlation with carcass composition greater than r = 0·70. Similarly, none of 9 offal measurements recorded had a worthwhile predictive value. In multiple regression certain combinations of these measurements accounted for as much as 77% of the variation in carcass fat, 64% in carcass muscle and 64 % in carcass bone.

The predictive efficiency of sample joint composition, specific gravity determinations and carcass measurements were evaluated in terms of the increased error variance using predicted values and the effect of this increase on sample size in treatment comparisons. Generally the results indicated that increasing treatment group size by relatively few animals is sufficient to absorb the additional error variance arising from the use of predicted values. This is particularly true where treatment differences of the order of one standard deviation exist and where part-carcass dissection values are used.

Type
Research Article
Information
Animal Production , Volume 7 , Issue 2 , June 1965 , pp. 189 - 201
Copyright
Copyright © British Society of Animal Science 1965

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References

REFERENCES

Barton, R. A., & Kirton, A. H., 1958. Assessment of fat in mutton and lamb. Proc. N.Z. Soc. Anim. Prod., 18: 112–125.Google Scholar
Bichard, M., & Maund, B. A., 1963. The prediction of egg weight and value from samples. Brit. Poult. Sci., 4: 209–216.CrossRefGoogle Scholar
Callow, E. H., 1944. The food value of beef from steers and heifers and its relation to dressing-out percentage. J. agric. Sci., 34: 177–189.CrossRefGoogle Scholar
Cole, J. W., Orme, L. E., & Kincaid, C. M., 1960. Relationships of loin eye area, separable lean of various beef cuts and carcass measurements to total carcass lean in beef. J. Anim. Sci., 19: 89–100.CrossRefGoogle Scholar
Gatherum, D. P., Harrington, G., & Pomeroy, L. W., 1960. Preliminary studies of eye judgement of the gammons of bacon pigs in relation to dissection data. Anim. Prod., 2: 175–185.Google Scholar
Hammond, J., 1932. Growth and Development of Mutton Qualities in the Sheep. Oliver & Boyd, Edinburgh.Google Scholar
Hirzel, R., 1939. Factors affecting quality in mutton and beef with special reference to the proportions of muscle, fat and bone. Onderstepoort J. Vet. Sci. Anim. Ind., 12: 379–550.Google Scholar
Hopper, T. H., 1944. Methods of estimating the physical and chemical composition of cattle. J. agric. Res., 68: 239–268.Google Scholar
Janicki, M. A., & Walczak, Z., 1960. Badonia nad trafnoscia wzrokowej i pomiarowej oceny szynki. Roczn. Tech. Chem. Zymn., 5: 81–90.Google Scholar
Kirton, A. H., & Barton, R. A., 1962. Studies of some indices of the chemical composition of lamb carcasses. J. Anim. Sci., 21: 553–557.CrossRefGoogle Scholar
Kravbill, H. F., Hiner, R. L., & Farnworth, V. M., 1954. The relation of organ weights to lean body mass and empty body weight in cattle. J. Anim. Sci., 13: 548–555.CrossRefGoogle Scholar
Lush, J. L., 1926. Practical methods of estimating the proportions of fat and bone in cattle slaughtered at commercial packing stations. J. agric. Sci., 32: 727–755.Google Scholar
Mason, I. L., 1951. Performance in beef cattle. Anim. Breed. Abstr., 19: 1–24.Google Scholar
O'Connor, L. K., & Lipton, S., 1960. The effect of various sampling intervals on the estimation of milk yield and composition. J. Dairy Res., 27: 389–398.CrossRefGoogle Scholar
Orme, L. E., Christian, R. E., & Bell, T. D., 1962. Live animal and carcass indices for estimating carcass composition in lambs. J. Anim. Sci., 21: 666 (Soc. Proc).Google Scholar
Pálsson, H., 1939. Meat qualities in the sheep with special reference to Scottish breeds and crosses. J. agric. Sci., 29: 544–626CrossRefGoogle Scholar
Robinson, J. J., Binet, F. E., & Doig, A. G., 1956. Fat lamb studies in Victoria. I. An assessment of the relative value of various external measurements for differentiating between various grades of export lamb carcasses. Austr. J. agric. Res., 1: 345–365.CrossRefGoogle Scholar
Snedecor, G., 1959. Statistical Methods. Iowa State College Press, Ames., Ia.Google Scholar
Timon, V. M., 1963. The measurement and inheritance of lamb carcass traits. Ph.D. thesis. Durham University School of Agriculture, Kings College, Newcastle-on-Tyne.Google Scholar
Timon, V. M., & Bichard, M., 1965a. Quantitative estimates of lamb carcass composition. 1. Sample joints. Anim. Prod., 7: 173–186.Google Scholar
Timon, V. M., & Bichard, M., 1965b. Quantitative estimates of lamb carcass composition. 2. Specific gravity. Anim. Prod., 7: 183–187.Google Scholar
Walker, D. E., & McMeekan, C. P., 1944. Canterbury lamb. N.Z. J. Sci. & Tech., 26(A): 51–73.Google Scholar
Woolf, B., 1951. Computation and interpretation of multiple regressions. J. roy. Stat. Soc., (B)13: 100–119.Google Scholar