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A selection index for dairy cows

Published online by Cambridge University Press:  02 September 2010

W. G. Hill
Affiliation:
Institute of Animal Genetics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JN
G. J. T. Swanson
Affiliation:
Milk Marketing Board, Thames Ditton, Surrey KT7 0EL
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Abstract

The rationale for a method of computing selection indices for dairy cows is outlined. It uses predicted transmitting abilities of sires from a best linear unbiased prediction or similar method of evaluation together with mean transmitting abilities (cow indices) of dams to estimate herd genetic levels. Indices for individual cows are computed using deviations from those of contemporaries in the herd of her sire's transmitting ability, her dam's index and her own production in each lactation.

The method is being used in the UK, cow indices being expressed as transmitting abilities relative to the same fixed genetic base as for sire evaluation.

Type
Research Article
Copyright
Copyright © British Society of Animal Science 1983

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References

REFERENCES

Christensen, L. G. 1981. Basic principles in the estimation of breeding values by direct updating. Z. Tierzücht. ZüchtBiol. 98: 132150.CrossRefGoogle Scholar
Dempflè, L. 1982. [Breeding value estimation in cattle with a detailed description of the BLUP method.] Fortschr. Tierzücht. ZüchtBiol. No. 3. Verlag-Paul Parey, Hamburg.Google Scholar
Dommerholt, J. 1980. [Developments in methods of estimating breeding value in bulls and cows.] Bedrijfsontwikkeling 11: 116170.Google Scholar
Hazel, L. N. 1943. The genetic basis for constructing selection indexes. Genetics, Princeton 28: 476490.CrossRefGoogle ScholarPubMed
Henderson, C. R. 1973. Sire evaluation and genetic trends. Proc. Anim. Breed. Genet. Symp., Blacksburg, Virginia, Am. Soc. Anim. Sci., pp. 1041.Google Scholar
Henderson, C. R. 1975. Use of all relatives in intraherd prediction of breeding values and producing abilities. J. Dairy Sci. 58: 19101916.CrossRefGoogle Scholar
Hill, W. G., Edwards, M. R., Ahmed, M.-K. A. and Thompson, R. 1983. Heritability of milk yield and composition at different levels and variability of production. Anim. Prod. 36: 5968.Google Scholar
Hill, W. G. and Pounds, E. G. D. 1980. Cow indexing and its use as a breeding aid. Proc. 5th Wld Friesian Conf., Bremen, pp. 5668.Google Scholar
Mauala, K. and Hanna, M. 1974. Reliable phenotypic and genetic parameters in dairy cattle. Proc. 1st Wld Congr. Genet. Appl. Livest. Prod., Madrid, Vol. I, pp. 541563.Google Scholar
Meyer, K. 1982. Estimation of genetic parameters for later lactations in dairy cattle. Proc. 2nd Wld Congr. Genet. Appl. Livest. Prod., Madrid, Vol. 7, pp. 256260.Google Scholar
Milk Marketing Board. 1979. The improved contemporary comparison. Rep. Breed. Prod. Org. Milk Mktg Bd, No. 29, pp. 9195.Google Scholar
Milk Marketing Board. 1980. Breeding index for contract mating cow selection. Rep. Breed. Prod. Org. Milk Mktg Bd, No. 30, pp. 7273.Google Scholar
Milk Marketing Board. 1981. The ICC base. Rep. Breed. Prod. Org. Milk Mktg Bd, No. 31, pp. 7677.Google Scholar
Milk Marketing Board. 1982. Cow genetic index. Rep. Breed. Prod. Org. Milk Mktg Bd, No. 32, pp. 5966.Google Scholar
Murphy, P. A., Everett, R. W. and Van vleck, L. D. 1982. Comparison of first lactations and all lactations of dams to predict sons' milk evaluations. J. Dairy Sci. 65: 19952005.CrossRefGoogle ScholarPubMed
New Zealand Dairy Board. 1970. 46th Farm Production Report. Farm Production Division, Wellington.Google Scholar
Pearson, R. E. and Miller, R. H. 1978. Cow evaluation in North America. Livest. Prod. Sci. 5: 1928.CrossRefGoogle Scholar
Philipsson, J., Dommerholt, J., Fimland, E., Gaillard, C., GjØl-christensen, L., Lederer, J., McClintock, A. E. and Mocquot, J. C. 1978. Problems in cow evaluation and current use of cow index. Report of a working group on cow evaluation. Livest. Prod. Sci. 5: 318.CrossRefGoogle Scholar
Quaas, R. L., Everett, R. W. and McClintock, A. C. 1979. Maternal grandsire model for dairy sire evaluation. J. Dairy Sci. 62: 16481654.CrossRefGoogle Scholar
Sales, JILL and Hill, W. G. 1976. Effect of sampling errors on efficiency of selection indices. 1. Use of information from relatives for single trait improvement. Anim. Prod. 22: 117.Google Scholar
Speight, B. R. 1977. New Scottish breeding index. Br. Friesian J. 59: 550551.Google Scholar