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A comparison of ‘on-farm’ and station testing in pigs

Published online by Cambridge University Press:  02 September 2010

P. R. Bampton ,
M. K. Curran  and
R. E. Kempson
P. R. Bampton
Affiliation:
Wye College, University of London, Ashford, Kent TN25 5AH
M. K. Curran
Affiliation:
Wye College, University of London, Ashford, Kent TN25 5AH
R. E. Kempson
Affiliation:
Wye College, University of London, Ashford, Kent TN25 5AH
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Summary

Data from 14 074 gilts, performance-tested on 66 farms, were matched with those from 3835 station-tested boar sibs, the whole comprising progeny test results on 456 sires. Both groups of data were adjusted independently for effect of month of test and the farm data further adjusted to a constant weight of 91 kg. Analysis of variance and covariance was carried out within herds using weighted sire progeny means. Phenotypic correlations between the same traits recorded ‘on-farm’ and in station, ranged from 0·12* (weight/age) to 0·25** (‘C’ + ‘K’ fat depth) while genetic correlations, computed using the estimated accuracy of each test, ranged from 0·23* (weight/age) to 0·49** (simple performance test index). Correlations were generally higher in Large White than in Landrace pigs.

Type
Research Article
Information
Animal Production , Volume 25 , Issue 1 , August 1977 , pp. 83 - 94
Copyright
Copyright © British Society of Animal Science 1977

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References

REFERENCES

Bampton, P. R. 1975. Genetic and phenotypic relationships between farm and central performance testing in pigs. Ph.D. Thesis, Univ. London.Google Scholar
Curran, M. K. 1973. ‘On-farm’ performance testing of pigs in Britain. Wld Rev. Anim. Prod. 9 (4): 58–63.Google Scholar
Falconer, D. S. 1952. The problem of environment and selection. Am. Nat. 86: 293–298.CrossRefGoogle Scholar
Falconer, D. S. 1960. Introduction to Quantitative Genetics. Oliver and Boyd, Edinburgh.Google Scholar
Flock, D., Von Schutzbar, W. and Lauprecht, E. 1970. [Correlations between performance test results of young boars and those of their full sibs and progeny.] Z. Tierzücht. ZuchtBiol. 86: 316–324.CrossRefGoogle Scholar
Hammond, J. 1947. Animal breeding in relation to nutrition and environmental conditions. Biol. Rev. 22: 195–213.CrossRefGoogle ScholarPubMed
Kempster, A. J. 1974. Genotype × environment interactions in pigs. 1st Wld Congr. Genet, appl. Livestock Prod. 1: 873–884. Editorial Garsi, Madrid.Google Scholar
Kino, J. W. B. 1955. The use of testing stations for pig improvement. Anim. Breed. Abstr. 23: 347–356.Google Scholar
King, J. W. B. 1972. The interaction of genotype and environment in pig production. In Pig Production, (ed. Cole, D. J. A.), pp. 21–36. Butterworth, London.Google Scholar
Morris, C. A. 1973. Genetic relationships between growth and reproduction in pigs. Ph.D. Thesis, Univ. Edinburgh.Google Scholar
Pig Industry Development Authority. 1965. Combined Testing. Recommendations by the Statistics Section for the Selection Index. Pig Industry Development Authority, London (Mimeograph).Google Scholar
Pig Industry Development Authority. 1968. Combined Testing. Revision. BC 290. Pig Industry Development Authority, London (Mimeograph).Google Scholar
Robertson, A. 1959. The sampling variance of the genetic correlation coefficient. Biometrics 15: 469–485.CrossRefGoogle Scholar
Smith, D. H. 1970. Pig testing and improvement; rate of progress and influence in Great Britain. Proc. Conf. Eur. Ass. Anim. Prod., Godollo, Hungary,Google Scholar
Snedecor, G. W. and Cochran, W. G. 1967. Statistical Methods. 6th ed. Iowa State Univ. Press, Ames, la.Google Scholar
Standal, N. 1970. On-the-farm testing of pigs in Norway. Proc. Conf. Pigs—Progress and Potential, Brighton, 1970. Meat and Livestock Commission, Bletchley, Bucks.Google Scholar
Standal, N. and Moen, R. A. 1971. Combining information from test stations and farms when estimating the breeding value of boars. Proc. Conf. Eur. Ass. Anim. Prod., Versailles.Google Scholar
Walters, J. R. 1974. Genetic parameters and environmental variation in pigs—with special reference to performance testing in farm conditions. M.Phil. Thesis, Univ. London.Google Scholar
Weniger, J. H., Glodek, P., Mennerich, A. and Schmidt, L. 1967. [Investigation of the method and application of the ultrasonic technique in the performance testing of pigs.] Bayer, landw. Jb. 44: 842–874.Google Scholar