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Effectiveness of a selection index for meat-type chickens



Effectiveness of a selection index for meat-type chickens



Japanese Poultry Science 14(4): 162-172



In a closed New Hampshire flock, selection was practised for 5 yr to increase 60-day egg production while maintaining a constant 9-wk body weight. In the base population, the phenotypic and genetic correlations between 9-wk body weight and egg production were -0.160 and -0.280 resp. v -0.057 and 0.149 in the selected line. Expected genetic changes in body weight and egg production were calculated by 3 methods.

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