INHERITANCE OF RESISTANCE TO YELLOW RUST CAUSED BY Puccinia striiformis f. sp. tritici ON HUITES F95 WHEAT (Triticum aestivum L.)

Abstract

Variance component estimation is helpful for the identification of variation sources in animal breeding; it is also helpful for the prediction of breeding values of selection candidates. Estimations of such components with SAS and Harvey programs are not the same, due to the use of different numerical algorithms, especially with unbalanced data, resulting in problems of interpretation. In this paper, both packages are compared; the aim is to provide guidelines for the selection of the best method and procedure to be used. Maximum likelihood and restricted maximum likelihood must be preferred because of their properties; the choice between them will depend on data type and what is going to be estimated. Harvey is more efficient than SAS in the use of computational resources, but it is restricted to only a few models.