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Maximum Likelihood Procedures for Estimating Genetic Parameters for Later Lactations of Dairy Cattle

Institute of Animal Genetics, West Mains Road, Edinburgh EH9 3JN, Scotland

ABSTRACT

An algorithm is presented for simultaneous estimation of variance and covariance components by restricted maximum likelihood in a two-way multivariate mixed model. In contrast to previous applications of restricted maximum likelihood the procedure accommodates environmental covariances between traits and also allows for different numbers of traits measured on different individuals. Results from an analysis of the first three lactation records of dairy cattle are given for a small set of data, and a computing strategy is described for this case.