| 摘要 |
FIELD: agriculture, poultry. ^ SUBSTANCE: the method deals with evaluating egg yield, egg's weight, shape index and double-yoked eggs laid by each hen before 30-wk-aged period to reject hens laying more than two double-yoked eggs. This method enables to exclude hens of lower values on egg yield and output of hatchable eggs out of selection process. ^ EFFECT: higher efficiency of selection. ^ 1 ex, 2 tbl
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