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Accuracy of evaluating the genotype of Simmental bulls in relation to different numbers of daughters


, : Accuracy of evaluating the genotype of Simmental bulls in relation to different numbers of daughters. Vestnik Sel' skokhozyaistvennoi Nauki, Alma Ata, Kazakh SSR 16(4): 45-49, 120

Data were analysed on 749 mature Russian Simmental (RS) cows sired by 33 bulls and on 201 RS 1st-calf cows sired by 20 bulls. The SD of average milk yield among daughter groups of various sizes are given; SD decreased as group size increased. The % of the phenotypic variance of milk yield attributable to sire differences increased from 10.5 for 2 mature cow daughters/group to 92 for 100 daughters; the corresponding figures for 1st-calf cows were 19.3 and 96.0.

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