多性状非求导约束最大似然法
multiple traits derivative free restricted maximum
多性状选择
Multi-characters selection
multi-characteristics selection
Synthetical selection
multi-characteristic selection
多性状综合遗传效应
Synthetic genetic effect multi-character
医源性多胎
iatrogenic multiple pregnancy
体型线性性状
Linear conformation traits
linear conformation trait
Figure linear characters
Body conformation linear traits
Linear trait
body linear type traits
body linear traits