The effectiveness of index selection for multiple traits in swine was confirmed by several selection experiments1’2’ 4' carried out in recent years. However, the indices used in those experiments were the sum of the standardized values for each traits and not designed according to the Smith-Hazel index procedures. Since 1970 the Smith-Hazel index has been widely used for the closed-herd swine breeding project in Japan and up to the present time, 12 strains has been developed and 15 strains are s t ill being developed by the index selection. The purpose of the present paper is to present the selection results obtained in seven strains of Landrace pigs involved in the project and evaluate the effectiveness of the selection index used for the practical swine breeding.

H. Mikami

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 488–492, 1982
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