不同留种策略下基因辅助BLUP的选择效果
发布时间：2018-07-24 10:00
【摘要】：为揭示基因辅助最佳线性无偏预测(BLUP)方法在不同留种策略下的选择效果,在假定目标数量性状同时受1个双等位基因QTL和多基因共同控制的前提下,模拟了在一个闭锁群体(10头公畜、190头母畜)内采用标记辅助BLUP连续选择10代的情形。选择试验共考虑了3种留种策略:策略Ⅰ仅根据个体估计育种值(EBV)高低留种;策略Ⅱ在每个公畜家系内选留EBV最高的1头公畜和19头母畜;策略Ⅲ在每个公畜家系内选留1头EBV最高的公畜,在每个母畜家系内选留EBV最高的1头母畜。结果表明,留种策略Ⅰ的遗传进展(包括QTL基因型值和多基因育种值进展)最高,QTL增效等位基因频率上升速度最快,其次为策略Ⅱ,策略Ⅲ的遗传进展最低,QTL增效等位基因频率上升最慢;不同留种策略下的群体近交系数总体上呈现策略Ⅰ策略Ⅱ策略Ⅲ的规律,但策略Ⅱ的群体近交系数与策略Ⅲ接近且远低于策略Ⅰ。在育种实践中实施基因辅助BLUP选择时,策略Ⅱ既能保证较高的遗传进展,又能有效控制近交,因而不失为一种理想的留种策略。
[Abstract]:In order to reveal the selection effect of gene assisted optimal linear unbiased prediction (BLUP) method under different seed retention strategies, it was assumed that the target quantitative traits were controlled by a double allele QTL and multiple genes simultaneously. The use of marker-assisted BLUP to select 10 generations in a closed population (10 males and 190 females) was simulated. Three seed retention strategies were considered in the selection experiment: strategy I was used only according to individual estimated breeding value (EBV), and strategy 鈪，
本文编号：2141013
[Abstract]:In order to reveal the selection effect of gene assisted optimal linear unbiased prediction (BLUP) method under different seed retention strategies, it was assumed that the target quantitative traits were controlled by a double allele QTL and multiple genes simultaneously. The use of marker-assisted BLUP to select 10 generations in a closed population (10 males and 190 females) was simulated. Three seed retention strategies were considered in the selection experiment: strategy I was used only according to individual estimated breeding value (EBV), and strategy 鈪，
本文编号：2141013
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