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Genetic parameters of British Landrace bacon pigs

Published online by Cambridge University Press:  02 September 2010

C. Smith  and
G. J. S. Ross
C. Smith
Affiliation:
A.R.C. Animal Breeding Research Organisation, West Mains Road, Edinburgh 9
G. J. S. Ross
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
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Summary

Genetic parameters were estimated among 26 traits in British Landrace bacon pigs. The data involved 2,296 pigs from 250 boars tested at the five British national pig progeny testing stations from 1959 to 1961 inclusive. Separate analyses were performed for each sex and for the litter totals, adjustments being made to the data for differences among periods within stations and for differences in age at start of test and in weight at slaughter. The genetic parameters were estimated from the sire components in a conventional hierarchical analysis of variance.

Estimates of heritability and genetic and phenotypic correlations among the 26 traits are presented and discussed. The parameter estimates were in very good agreement with figures obtained in a previous analysis with Large White pigs. They indicate that a large part of the variation and covariation among the 26 traits is genetic in origin, and the traits involved would change in response to selection. Moreover, with regard to their concurrent improvement there were no serious antagonisms in the genetic relationships among the traits studied. There was however, evidence of an interaction of sire and sex of progeny for nine of the 26 traits.

A principal component analysis was used in an attempt to summarise the correlations among the 26 traits. The first two components gave a reasonable fit to the correlation pattern and these were associated with fat depth, measures of muscling and dressing-out percentage.

Type
Research Article
Information
Animal Production , Volume 7 , Issue 3 , October 1965 , pp. 291 - 301
Copyright
Copyright © British Society of Animal Science 1965

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References

REFERENCES

Beilharz, R. G., 1963. On the possibility that sex-chromosomes have a greater effect than autosomes on inheritance. J. Genet., 58: 441–449.CrossRefGoogle Scholar
Fredeen, H. T., 1953. Genetic aspects of Canadian bacon production. Publ. Dep. Agric, Can., No. 889. 38 pp.Google Scholar
Fredeen, H. T., & Jonsson, P., 1957. Genie variance and covariance in Danish Landrace swine as evaluated under a system of individual feeding of progeny test groups. Z. Tierz. ZuchtBiol., 70: 348–363.CrossRefGoogle Scholar
Hetzer, H. O., Harvey, W. R., & Peters, W. H., 1963. Selection for high and low fatness in Duroc and Yorkshire swine. Abstr. in Genetics To-day. Vol. 1, p. 268, Editor Geerts, S. J.. Pergamon Press.Google Scholar
Johansson, I., & Korkman, N., 1950. A study of the variation in production traits of bacon pigs. Acta Agric. scand., 1: 62–96.CrossRefGoogle Scholar
Jonsson, P., 1963. Danish pig progeny test results. Z. Tierz. ZüchtBiol., 78: 205–252.CrossRefGoogle Scholar
Jonsson, P., & King, J. W. B., 1962. Sources of variation in Danish Landrace pigs at progeny testing stations. Acta Agric. scand., 12: 68–80.CrossRefGoogle Scholar
Korkman, N., 1957. Selection with regard to the sex difference of body weight in mice. Hereditas, 43: 665–678.CrossRefGoogle Scholar
Lindley, D. V., & Miller, J. C. P., 1953. Cambridge Elementary Statistical Tables. Cambridge Univ. Press, Cambridge.Google Scholar
McConnell, J., Fechheimer, N. S., & Gilmore, L. O., 1963. Somatic chromosomes of the domestic pig. J. Anim. Sci., 22: 374–379.CrossRefGoogle Scholar
Osterhoff, D., 1956. Genetic studies and progeny testing based on results of pig fattening tests. Z. Tierz. ZüchtBiol., 68: 199–239.CrossRefGoogle Scholar
Robertson, A., 1959. The sampling variance of the genetic correlation coefficient. Biometrics, 15: 469–85.CrossRefGoogle Scholar
Shaklee, W. E., Knox, C. W., & Marsden, S. J. 1951. Inheritance of the sex difference of body weight in turkeys. Poult. Sci., 30: 930 (Abstr.)Google Scholar
Smith, C., 1965. Results of pig progeny testing in Britain. Anim. Prod., 7: 133–140.Google Scholar
Smith, C., King, J. W. B., & Gilbert, N., 1962. Genetic parameters of British Large White bacon pigs. Anim. Prod., 4: 128–143.Google Scholar
Thomas, C. H., Blow, W. L., Cockerham, C. C., & Glazener, E. W., 1958. The heritability of body weight, gain, feed consumption and feed conversion in broilers. Poult. Sci., 37: 862–869.CrossRefGoogle Scholar