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Performance of British Landrace pigs selected for high and low incidence of halothane sensitivity 2. Growth and carcass traits

Published online by Cambridge University Press:  02 September 2010

A. J. Webb  and
S. P. Simpson
A. J. Webb
Affiliation:
AFRC Animal Breeding Research Organisation, West Mains Road, Edinburgh EH9 3JQ
S. P. Simpson
Affiliation:
AFRC Animal Breeding Research Organisation, West Mains Road, Edinburgh EH9 3JQ
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Abstract

The effects of halothane phenotype on growth were estimated from generations 1 to 3 of British Landrace positive and negative selection lines. A total of 241 full-sib pairs (castrated male and gilt) from 133 second litters were performance tested from 25 to 85 kg live weight on either ad libitum or scale (0·69 g/g ad libitum daily food intake) feeding.

Compared with negative reactors over feeding regimes, positive pigs showed significant advantages in food conversion ratio (−0·07, s.e. 0·02), eye-muscle area (0·8, s.e. 0·3 cm2), proportion of lean in sample joints (16, s.e. 7 g/kg), and visual conformation scores, accompanied by disadvantages in meat colour (5·9, s.e. 2·1 EEL units), incidence of pale, soft, exudative (PSE) meat (0·36 v. 0·05, P < 0·001), post-weaning mortality (0·09 v. 0·01, P < 0·001) and ad libitum daily food consumption (−0·08, s.e. 0·02 kg). In addition, there were non-significant indications of an advantage in carcass lean proportion (11, s.e. 10 g/kg), with disadvantages in carcass length (−14, s.e. 7 mm) and proportion of lean in high-priced cuts (−6, s.e. 2 g/kg). Only daily food consumption showed significant selection line × feeding level interaction.

Averaged over feeding regimes, an estimated extra return of £1·70 (s.e. 0·50) from lean growth would be offset by increased PSE and mortality to give a net loss of roughly £3·90 (s.e. 1·00) per positive reactor. Taking these results as the minimum difference between homozygotes, and if the gene is additive for lean proportion but recessive for stress susceptibility, the heterozygote would have an advantage of £0·90 over the normal homozygote. The effects of the gene on growth and carcass traits in British Landrace appear similar to those reported in other breeds, although the advantage of positive reactors in lean proportion may be slightly smaller.

Type
Research Article
Information
Animal Production , Volume 43 , Issue 3 , December 1986 , pp. 493 - 503
Copyright
Copyright © British Society of Animal Science 1986

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References

REFERENCES

Barton-Gade, P. 1984. Influence of halothane genotype on meat quality in pigs subjected to various pre-slaughter treatments. Commission of the European Communities Seminar on Meat Quality, Bristol, Paper 1: 3.Google Scholar
Carden, A. E., Hill, W. G. and Webb, A. J. 1983. The inheritance of halothane susceptibility in pigs. Génétique, Sélection et Evolution 15: 65–81.CrossRefGoogle ScholarPubMed
Cuthbertson, A. 1968. PIDA dissection techniques. Proceedings of Symposium on Methods of Carcass Evaluation, European Association of Animal Production, Dublin. (Mimeograph).Google Scholar
Gusella, J. F., Wexler, N. S., Conneally, P. M., Naylor, S. L., Anderson, M. A., Tanzi, R. E., Watkins, P. C., Ottina, K., Wallace, M. R., Sakaguchi, A. Y., Young, A. B., Shoulson, I., Bonilla, E. and Martin, J. B. 1983. A polymorphic DNA marker genetically linked to Huntington's Disease. Nature, London 306: 234–238.CrossRefGoogle ScholarPubMed
Harvey, W. R. 1977. User's guide for LSML76. Mixed model least-squares and maximum likelihood computer program. Ohio State University, Columbus.(Mimeograph).Google Scholar
Hill, W. G. 1980. Design of quantitative genetic selection experiments. In Selection Experiments in Laboratory and Domestic Animals (ed. Robertson, A.), pp. 1–13. Commonwealth Agricultural Bureaux, Slough.Google Scholar
Imlah, P. 1982. Linkage studies between the halothane (Hal), phosphohexose isomerase (Phi) and the S(A-O) and H red blood cell loci of Pietrain/Hampshire and Landrace pigs. Animal Blood Groups and Biochemical Genetics 13: 245–262.CrossRefGoogle Scholar
Mitchell, G., Smith, C., Makower, M. and Bird, P. J. W. N. 1982. An economic appraisal of pig improvement in Great Britain. 1. Genetic and production aspects. Animal Production 35: 215–224.Google Scholar
Simpson, S. P., Webb, A. J. and Wilmut, I. 1986. Performance of British Landrace pigs selected for high and low incidence of halothane sensitivity. 1. Reproduction. Animal Production 43: 485–492.Google Scholar
Smith, C. 1982. Estimates of trends in the halothane gene in pig stocks with selection. Zeitschrift für Tierzüchtung und Züchtungsbiologie 99: 232–240.CrossRefGoogle Scholar
Smith, W. C. and Lesser, D. 1982. An economic assessment of pale, soft exudative musculature in the fresh and cured pig carcass. Animal Production 34: 291–299.Google Scholar
Southwood, O. I., Webb, A. J. and Carden, A. E. 1985 Halothane sensitivity of the heterozygote at the halothane locus in British Landrace pigs. Animal Production 40: 540–541 (Abstr.).Google Scholar
Webb, A. J. 1980. The incidence of halothane sensitivity in British pigs. Animal Production 31: 101–105.Google Scholar
Webb, A. J., Carden, A. E., Smith, C. and Imlah, P. 1982. Porcine stress syndrome in pig breeding. Proceedings of 2nd World Congress on Genetics Applied to Livestock Production, Madrid, Vol. 5, pp. 588–608. Editorial Garsi, Madrid.Google Scholar
Webb, A. J., Imlah, P. and Carden, A. E. 1986. Succinylcholine and halothane as a field test for the heterozygote at the halothane locus in pigs. Animal Production 42: 275–279.Google Scholar
Webb, A. J. and Jordan, C. H. C. 1978. Halothane sensitivity as a field test for stress-susceptibility in the pig. Animal Production 26: 157–168.Google Scholar
Webb, A. J., Southwood, O. I., Simpson, S. P. and Carden, A. E. 1985. Genetics of porcine stress syndrome. In Stress Susceptibility and Meat Quality in Pigs (ed. Ludvigsen, J. B.), pp. 9–30. European Association of Animal Production Publication No. 33, Rome.Google Scholar