Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-23T06:56:01.305Z Has data issue: false hasContentIssue false
  • English
  • Français

The effect of different levels of management on the assessment of differences within a variety of chicken

Published online by Cambridge University Press:  02 September 2010

M. W. Oakes
M. W. Oakes
Affiliation:
Research Division, Thornber Bros. Ltd., Mytholmroyd, Yorkshire
Get access

Extract

The data relating to twenty single location trials, involving the progeny of seven sires from one variety mated with random females from another, have been analysed to obtain estimates of sire × location (genotype–environment) interaction for egg production, 23- and 64-week body weights and 32-and 45-week egg weights. In no case was a significant interaction found, indicating genetic correlations not significantly different from unity.

The between- and within-sire components of variance have been calculated for each trait on each location separately. The regressions of these components on the mean levels at the locations have been obtained. Though low and non-significant, they tend to support the use of those locations giving maximum expression of a trait for comparisons involving that trait.

Type
Research Article
Information
Animal Production , Volume 9 , Issue 1 , February 1967 , pp. 121 - 125
Copyright
Copyright © British Society of Animal Science 1967

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bowman, J. C., & Powell, J. C., 1962. The effect of different levels of management on the assessment of differences between varieties of chickens. I. Eight-week body weight. Anim. Prod., 4: 319–327.Google Scholar
Bowman, J. C., & Powell, J. C., 1964. The effect of different levels of management on the assessment of differences between varieties of chickens, II. Egg production, mortality and egg weight. Anim. Prod., 6: 195–205.Google Scholar
Dickerson, G. E., 1962. Implications of genetic-environmental interaction in animal breeding. Anim. Prod., 4: 47–63.Google Scholar
Falconer, D. S., 1952. The problem of environment and selection. Amer. Nat., 86: 293–298.CrossRefGoogle Scholar
Falconer, D. S., & Latyszewski, M., 1952. The environment in relation to selection for size in mice. J. Genet., 51: 67–80.CrossRefGoogle Scholar
Hammond, J., 1947. Animal breeding in relation to nutrition and environmental conditions. Biol. Rev., 22: 195–213.CrossRefGoogle ScholarPubMed
McBride, G., 1958. The environment and animal breeding problems. Anim. Breed. Abstr., 26: 349–358.Google Scholar
Robertson, A., 1959. The sampling variance of the genetic correlation coefficient. Biometrics, 15: 469–486.CrossRefGoogle Scholar
Wright, S., 1939. Genetic principles governing the rate of progress of livestock breeding. Proc. Amer. Soc. Anim. Prod., 32nd Ann. Meet., 18–26.CrossRefGoogle Scholar