The order of heterosis from large to small in four imported meat sheep by the analysis of genetic relationship is White-Suffolk, Black-Suffolk, Dorset, Texel.

• 经遗传关系分析，在引进的4个肉羊品种中，与小尾寒羊杂交优势由大到小依次为白头萨福克、黑头萨福克、道赛特、得克赛儿，与实际杂种优势测定结果相符。