These results suggest that IGF-I gene has significant effects on individual birth weight and backfat thickness, and selection of the B allele is favored in terms of birth weight and backfat thickness.

• 因此，推测IGF-I基因对个体的初生重和胴体瘦肉率存在一定的影响，选择带有B等位基因的个体，有望提高个体的初生重和胴体的瘦肉率。关键词 猪；IGF-I基因；遗传多态性；