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The electronic prediction of commercial yield and lean content in pig carcasses

Published online by Cambridge University Press:  02 September 2010

S. D. M. Jones  and
C. R. Haworth
S. D. M. Jones
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Ontario, Canada N1G 2W1
C. R. Haworth
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Ontario, Canada N1G 2W1
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Abstract

One hundred and fourteen pig carcasses were measured within 1 h of slaughter for fat thickness at three locations using the SFK Fat-O-Meater. The three fat thickness locations were the last rib and 3rd and 4th last ribs measured 70 mm from the dorsal mid-line over the m. longissimus, and the lumbar fat thickness which was recorded on the anterior face of the m. glutens medius on the dorsal mid-line of the split carcass. Lean depth measurements were also recorded at the last rib and 3rd and 4th last ribs for all carcasses. After overnight chilling the leanness of each carcass was estimated using an EMME SA-1 machine. The carcasses were then separated into the major tissues. The weight of trimmed North American commercial joints (standard of 6 mm subcutaneous fat) and their lean content were best predicted by half carcass weight (residual s.d. = 0·78 and 1·23 kg respectively), whereas the EMME machine readings alone had low precision (residual s.d. = 1·51 and 1·41 kg respectively). The proportion of North American commercial joints in a carcass and their lean content were best predicted by lumbar fat (residual s.d. = 16·5 and 25·8 g/kg). The digital readout of lean content provided by the EMME machine appeared to be more related to carcass weight than lean weight, as residual s.d. for regressions increased when the overall sample was divided into two weight classes. Multiple regression equations indicated that half carcass weight and fat thickness measurements gave the best precision to predict joint and lean weights, whereas fat thickness and lean depth measurements gave the best prediction of carcass joint and lean proportions.

Type
Research Article
Information
Animal Production , Volume 37 , Issue 1 , August 1983 , pp. 33 - 40
Copyright
Copyright © British Society of Animal Science 1983

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References

REFERENCES

Barr, A. J., Goodnight, J. H., Sall, J. P. and Helwig, J. T. 1976. A User's Guide to SAS. Statistical Analysis Systems Institute, Raleigh, N.C.Google Scholar
Cuthbertson, A. 1968. PIDA dissection techniques. Proc. Symp. Meth. Carcass Evaluation, Eur. Ass. Anim. Prod., Dublin.Google Scholar
Fredeen, H. T., Martin, A. H. and Sather, A. P. 1979. Evaluation of an electronic technique for measuring lean content of the live pig. J. Anim. Sci. 48: 536–540.Google Scholar
Fredeen, H. T. and Weiss, G. M. 1981. Comparison of techniques for evaluating lean content of hog carcasses. Can. J. Anim. Sci. 61: 319–333.Google Scholar
Jones, S. D. M. and Haworth, C. R. 1983. Instrument prediction of the lean content of pork carcasses using ultrasound or light reflectance. J. Anim. Sci. 56: 418–425.Google Scholar
Kempster, A. J., Chadwkk, J. P., Jonhs, D. W. and Cuthbhrtson, A. 1981. An evaluation of the Hennessy and Chong fat depth indicator, and the Ulster probe, for use in pig carcass classification and grading. Anim. Prod. 33: 319–324.Google Scholar
Khmpsthr, A. J. and Evans, D. G. 1979. A comparison of different predictors of the lean content of pig carcasses. 1. Predictors for use in commercial classification and grading. Anim. Prod. 28: 87–96.Google Scholar
Kempster, A. J., Jonhs, D. W. and Cuthbhrtson, A. 1979. A comparison of the Danish MFA, Ulster and optical probes for use in pig carcass classification and grading. Meat Sci. 3: 109–120.Google Scholar
Koch, R. M. and Varnadorh, W. L. 1976. Use of electronic meat measuring equipment to measure cutout yield of beef carcasses. J. Anim. Sci. 43: 108–113.Google Scholar
Martin, A. H., Frkdeen, H. T., Wiiss, G. M., Fokiin, A. and Sim, D. 1981. Yield of trimmed pork product in relation to weight and backfat thickness of the carcass. Can. J. Anim. Sci. 61: 299–310.Google Scholar
Pedfrson, O. K. 1981. Pig carcass grading in Denmark. Pork Grading Conf., Des Moines, Iowa.Google Scholar