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Multibreed Sire Evaluation Procedures Across Countries

University of California^,3, Davis 95616

Abstract

Multiple trait sire evaluation procedures that use information from several countries were developed and are presented. These procedures account for direct and maternal, additive and nonadditive effects and unequal genetic and environmental covariances as well as genotype x environment interaction effects. Intra- and inter-country additive genetic covariances must be estimated before these procedures can be used. Because data will come from different countries, international cooperation will be necessary to carry out the evaluations described. These procedures could be used to obtain more accurate exotic, hybrid and native sire evaluations in native environments. Also, they could be used to obtain preliminary sire proofs and sire proofs for sires used in several countries.

¹ Present address: Dept. of Anim. Sci., Cornell Univ., Ithaca, NY 14853.

² The authors express their appreciation to A. P. Fenech for his assistance on statistical aspects and to T. R. Famula for useful discussions. The senior author acknowledges with gratitude the financial support of the Univ. of California, Davis, throughout his graduate studies.

³ Dept. of Anim. Sci.