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Journal of Genetics

, Volume 50, Issue 1, pp 1–8 | Cite as

Estimation of genetic gain in milk yield by selection in a closed herd of dairy cattle

  • J. M. Rendel
  • Alan Robertson
Article

Summary

  1. 1.

    Methods of estimating the rate of genetic gain achieved in animal improvement are discussed and criticized.

     
  2. 2.

    A theoretical method of estimation of the maximum possible genetic gain of milk yield under direct selection is presented for a closed herd of dairy cattle. The maximum possible gain is approximately 1% of the average yield.

     
  3. 3.

    The method can also be used for the estimation of genetic gain from the selection practised in an actual, herd. An estimated gain of milk yield of 0.7% per year is given for one herd.

     

Keywords

Genetic Improvement Milk Yield Dairy Cattle Generation Length Genetic Gain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bonnier, G., Hansson, A. &Skjervold, H. (1948). Studies on monozygous cattle twins. IX. The interplay of heredity and environment on growth and yield.Acta Agric. Suec. 3, 1.Google Scholar
  2. Dickerson, G. E. &Hazel, L. N. (1944) The effectiveness of selection on progeny performance as a supplement to earlier culling in livestock.J. Agric. Res. 69, 459.Google Scholar
  3. Fisher, R. A. &Yates, F. (1938).Statistical Tables for Biological, Agricultural and Medical Research. Edinburgh: Oliver and Boyd.Google Scholar
  4. Lörtscher, H. (1937). Variationsstatistische Untersuchungen an Leistungs-Erhebungen in einer British Friesian Herde.Z. Zücht. B,39, 257.Google Scholar
  5. Lush, J. L. (1946).Animal Breeding Plans. Ames, Iowa: Iowa State College Press.Google Scholar
  6. Nelson, R. H. (1943). Measuring the amount of genetic changes in a herd average.J. Anim. Sci. 2, 358,Google Scholar
  7. Pearson, K (Ed.) (1931).Tables for Statisticians and Biometricians, Part II. Cambridge University Press.Google Scholar

Copyright information

© Indian Academy of Sciences 1950

Authors and Affiliations

  • J. M. Rendel
    • 1
  • Alan Robertson
    • 1
  1. 1.Animal Breeding and Genetics Research OrganizationInstitute of Animal GeneticsEdinburgh

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