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Journal of Dairy Science Vol. 57 No. 8 963-972
© 1974 by American Dairy Science Association ®
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General Flexibility of Linear Model Techniques for Sire Evaluation

C. R. Henderson

Department of Animal Science, Cornell University Ithaca, New York 14850

ABSTRACT

Linear model methods applied to the mixed model provide a flexible and powerful tool for sire evaluation under a wide variety of situations. These techniques combine the known, desirable properties of selection index and the capability of linear model methods to deal with large sets of data with unequal subclass numbers. The problem to be solved is to find the best evaluation of a sire that is regarded as a random individual from some specified subpopulation (group). Defining as best that evaluation (prediction) which, in the class of linear functions of the observations, is unbiased and has die smallest possible variance of prediction errors, the problem has been solved provided relative values of elements of the variance-covariance matrix of random variables in the model are known. The method derived to meet these specifications is Best Linear Unbiased Prediction. The computing technique is a simple modification of least squares.




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