FIELD: poultry farming. SUBSTANCE: method involves evaluating individual hatches and selecting cocks, which did not reduce ovum impregnation during reproduction; providing additional evaluation of cocks-sons upon reproduction and rejecting those produced from cocks-fathers, whose impregnation capacity is abruptly reduced in later batches at the end of reproduction period. EFFECT: increased efficiency in producing descendants-cocks with impregnation capacity exceeding average factor. 2 tbl, 1 ex
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