Research on the generation index of selection efficiency

【Objective】 Under the assumption that there were no new variation caused by mutation and migration,and the environment remained unchanged,the selection efficiency in quantitative genetics was studied.【Method】 According to the selection theory to improve quantitative characters,generation index of selection efficiency was constructed with the ratio of the genetic progress of generations to the genetic progress on the first generation in order to measure the selection effect and potential.【Result】 If the heritability of zero generation of the breeding population was known,the generation index of generations can be calculated:On the first generation it was 1,and on later generations it can be calculated by heritability.When the selection proportion was invariant and the heritability of zero generation was in different situations,the corresponding generation index changed fast on the former three generations of selection,but quickly stabilized.When the heritability was fixed in low,medium and high levels respectively,the genetic progress on the first generation of the population,when in different selection proportion,decreased as the selection proportion increased,and the higher the level of heritability,the greater the genetic progress and also the larger the generation index of selection efficiency.【Conclusion】 The main factor which could influence selection efficiency was heritability,and the greater the heritability,the higher the selection efficiency.And the selection potential of the population was only 2 to 3 generations,so new selection response could be brought into breeding.