Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-25T17:40:11.972Z Has data issue: false hasContentIssue false
  • English
  • Français

Selection indices for rabbit improvement

Published online by Cambridge University Press:  27 March 2009

M. H. Khalil ,
J. B. Owen  and
E. A. Afifi
M. H. Khalil
Affiliation:
Department of Animal Production, Faculty of Agriculture at Moshtohor, Zagazig University, Banha Branch, Egypt
J. B. Owen
Affiliation:
Department of Agriculture, University College of North Wales, Bangor, Gwynedd, LL51 2UW
E. A. Afifi
Affiliation:
Department of Animal Production, Faculty of Agriculture at Moshtohor, Zagazig University, Banha Branch, Egypt
Get access Rights & Permissions [Opens in a new window]

Summary

Records on 884 litters and 3051 bunnies of the Bauscat (B) and Giza White (G) breeds were used to construct different selection indices.

A series of selection indices and subindices were constructed for both B and G does. An index or subindex based on litter size at weaning, mean bunny weight at weaning, litter size at birth and litter weight at birth could be practically applied to improve the productivity of B and G does, under local Egytian conditions. Preweaning mortality did not contribute significantly to the different selection indices and subindices. Litter weight at birth made a large contribution to the different indices and subindices constructed. Litter size at weaning contributed little in the subindices to be used to select for mean bunny weight at weaning. Mean bunny weight at weaning made a lower contribution to the subindices to be used to select for litter size at weaning. The expected genetic gain in litter size at weaning was slight in all of the selection indices and subindices constructed because of low heritability values for this trait. Considerable genetic improvement for doe productivity of the G breed might be achieved through selection for mean bunny weight at weaning.

Four selection indices and subindices were constructed for B and G rabbits. The index or subindex based on 6-week weight and 8-week weight was the best criterion for selection for the genetic improvement of 6-week weight and 12-week weight. Six- and 8-week weight contributed substantially while 12-week weight contributed little to the value of most of the selection indices and subindices constructed. The highest total genetic gain attributable to 6- and 12-week weight was obtained when the selection indices or subindices including 6-week weight and 8-week weight were used.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 107 , Issue 3 , December 1986 , pp. 537 - 548
Copyright
Copyright © Cambridge University Press 1986

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

Binet, F. E. (1965). On construction of an index for indirect selection. Biometrics 21, 291–299.CrossRefGoogle ScholarPubMed
Cunningham, E. P. (1969). The relative efficiences of selection indexes. Acta Agricidturae Scandinavica 19, 45–48.CrossRefGoogle Scholar
Cunningham, E. P. (1977). Selind: A Fortran Computer Program for Genetic Selection Indexes (User's Guide). Co. Dublin and Dublin University, Ireland: An Foras Taluntais.Google Scholar
Harvey, W. R. (1977). User's guide for LSML76, Mixed Model Least-Squares and Maximum Likelihood Computer Program. Mimeo., Ohio State University, U.S.A.Google Scholar
Hazel, L. N. (1943). The genetic basis for constructing selection indexes. Genetics 28, 476–490.CrossRefGoogle ScholarPubMed
McReynolds, W. E. (1974). Genetic parameters of early growth in a population of New Zealand White rabbits. Ph.D. dissertation, Ohio State University, U.S.A.Google Scholar
Smith, C. (1983). Effect of changes in economic weights in the efficiency of index selection. Journal of Animal Science 56, 1057–1064.CrossRefGoogle Scholar