The efficiency of index selection of sires in dairy breeding

Kuznetsov, V.M.

Sel'skokhozyaistvennaya Biologiya 9: 20-26


ISSN/ISBN: 0131-6397
Accession: 006669814

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Experimental material comprised 74 Black-and-White sires. Four different selection variants were modelled: selection only for daughter's milk yield, two-stage selection for live weight at 12-months of age and daughter's milk yield, two-stage selection with the use of sr stage-1 information at stage 2 and selection for selection index. The genetic superiority of the sires finally selected (15 bulls) was +0.5, +5.3, +5.9 and +4.3 kg in 12-month live weight and +277, +243, +288 and +265 kg in milk yield, respectively. The expected net profit per one fertile insemination with the semen of the average sire of this selected group was 16.0, 17.2, 17.3 and 17.8 roubles, respectively. A conclusion about the advantage of index selection is drawn.