A discussion is given on new developments and views that are relevant for present pig breeding programmes. Attention is given to simultaneous selection for production and reproduction traits, specialized sire and dam lines, use of field data, statistical techniques for breeding value estimations, and new traits to select for. The most important conclusions are: - Specialization of sire and dam lines and inclusion of reproduction traits in the breeding goal leads to the requirement of a large nucleus. - Breeding value estimation should be based on animal models, so that optimum use is made of all information that is in the data (nucleus data as well as field data). - Animal models make it possible (for national programmes as well as for private companies) that the breeding programme is based on a group of nucleus herds. - Due to inclusion of reproduction traits and meat quality in the breeding goal, and as a consequence of G x E interactions, family information becomes very important. - Family information will only be relevant when efficient selection between families is possible. For this reason, a large annual number of breeding boars should be used. This will keep rate of inbreeding also to an acceptable level.

A. G de Vries, D. A Sorensen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 395–404, 1990
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