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随着到达选择年龄家系数的增加,选择强度增高,期望遗传增益也随之增加。在遗传测定中,为能选取更多的优树,这就得推迟种子园的营建时间,从而推迟了遗传增益的获得。为此,本文提出了在一个改良周期内确定营建高级种子园的最佳时间的方法。我们估计了育种种群中因到达选择年龄家系数的增多所增加的遗传增益。整个群体全部评定后总增益可达到最大值,但增益的
As the coefficient of family age at the age of choice increases, the choice intensity increases and the expected genetic gain increases. In genetic testing, in order to select more trees, which have to delay the construction of seed orchard time, thus postponing the gain of genetic gain. To this end, this paper presents a method to determine the best time to build a high-quality seed orchard in a modified cycle. We estimate the genetic gain in the breeding population due to an increase in the coefficient of family age at selection age. After the whole group is assessed, the total gain can reach the maximum, but gain