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A note on the properties of the cumulative difference method for sire evaluation

Published online by Cambridge University Press:  02 September 2010

L. Dempfle
L. Dempfle
Affiliation:
Institut für Tierzucht der Technischen Universität München, 805 Freising, Germany
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Summary

Several of the various dairy sire evaluation methods now in use account for the genetic level of contemporary herdmates. In the cumulative difference method of Bar-Anan and Sacks the contemporary comparison estimate is first calculated and then adjusted by taking into account the genetic level of the contemporaries. These estimates depend on the genetic level of the herdmates. A modification of the procedure in which account is taken of the herdmates' genotype before regressing for small numbers would remedy this deficiency without increasing computing costs.

Type
Research Article
Information
Animal Production , Volume 23 , Issue 1 , August 1976 , pp. 121 - 124
Copyright
Copyright © British Society of Animal Science 1976

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References

REFERENCES

Bar-Anan, R. and Sacks, J. M. 1974. Sire evaluation and estimation of genetic gain in Israeli dairy herds. Anim. Prod. 18: 59–66.Google Scholar
Cunningham, E. P. 1965. The evaluation of sires from progeny test data. Anim. Prod. 7: 221–231.Google Scholar
Dempfle, L. 1975. [A comparison of the cumulative difference method with the sire comparison method.] Proc. 26th Mtg EAAP, Warsaw, Poland.Google Scholar
Henderson, C. R. 1973. Sire evaluation and genetic trends. In Proc. Anim. Breed. Genet.Symp.Blacksburg, Virginia, pp. 10–41. American Society of Animal Science, Champaign, Illinois.Google Scholar
Thompson, R. 1976. Relationship between the cumulative difference and best linear unbiased predictor methods of evaluating bulls. Anim. Prod. 23: 15–24.Google Scholar