J. Anim Sci.
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J. Anim Sci. 1961. 20:506-509.
© 1961 American Society of Animal Science
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Performance Index for Lifetime Production

S. S. Y. Young and G. M. Tallis1

Division of Animal Genetics, C.S.I.R.O., McMaster Laboratory, Glebe, Sidney, N.S.W.

Abstract

The theory of constructing a performance index which may be used in the selection of animals for phenotypic gains is presented. This index is compared with the genetic selection index and numerical examples are used to illustrate how the use of each index is likely to affect genetic and phenotypic gains.

Footnotes

1 Thanks are due to Professor P. R. McMahon of the School of Wool Technology, University of New South Wales who suggested to us the subject of this investigation, to Miss Helen Newton Turner of the Division of Animal Genetics for her comments on the manuscript and to Miss Turner and Mr. C. H. S. Dolling of the same Division for making available the data used in the numerical example.






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