次级性状是指那些遗传力低，或者不容易量化测量的性状。比如繁殖力，抗病力等。
经统计分析表明，北京奶牛群的乳用、肉用和次级性状经济重要性之比为2：1：2。
Statistical analysis shows that the economical importances of lactation, beef and secondary traits in this population are in the proportion of 2 : 1 : 2.
用于作物数量性状基因座（QTL）定位研究的次级作图群体有近等基因系、导入系、染色体片段代换系等。
The secondary mapping populations (SMPs), which were used to map quantitative trait loci (QTLs), include near-isogenic lines, introgression lines, chromosome segment substitution lines et al.
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