The effect of the nucleus size and the number of sires selected on the selection response and on i t 's variance was in vestigated in adult MOET schemes. The nucleus size was varied from 256 to 4096 animals and the number of sires selected from 4 to 16. The schemes were considered with and without the r e s tr ic tio n of sele ctin g only one sire per fu ll sib group. R estricted schemes were in fe rio r to u n restricted schemes, which selected twice as much sires. S election . o f 4 up to 16 sires provided almost the same selection responses in re s tric te d schemes, while the variances of the s e le c tio n responses were considerably lower when more sires were selected . Increasing the nucleus size caused a marked increase in genetic gain up to a nucleus size of 1000-2000 animals. Above 500 animals, the nucleus size did not a ffe c t the variance of the sele c tio n response. Here, the number of sires selected determined this variance, which im plied that sele ctio n of 16 sires was preferred .

Theo HE Meuwissen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 271–274, 1990
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