不同杂交组合猪繁殖性状的杂种优势分析

根据青海八眉猪（本）、长白（长）、大白（大）及其长×本、大×本和长×长×本杂交组合的繁殖性状记录，研究了3种杂交组合繁殖性状的杂种优势。结果表明：长×本、长×长×本杂交组合繁殖性状各指标均表现有杂种优势，尤其以长×本杂交组合的产仔数、产活仔数优势明显；以长×长×本杂交组合的断奶窝重、断奶重、20日龄窝重、20日龄重、初生窝重等性状优势明显；大×本杂交组合繁殖性状的杂种优势最低，部分性状不表现杂种优势。

Comparison of reproductive traits in three hybrid combinations of swine

Based on the reproductive performance of Qinghai Bamei, Landrace, Yorkshire, and as well as three hybrid combinations of Landrace × Bamei, Yorkshire × Bamei and Landrace × Bamei × Bamei, the heterosis rate of reproductive traits in three different hybrid combination was studied. The results showed that there was heterosis of reproductive traits in the combinations of Landrace × Bamei and Landrace × Landrace × Bamei and the combination of Landrace × Baimei showed significant heterosis in birth litter numth and live litter mumth. The Landrace × Landrace × Bamei showed significant heterosis in birth litter weight, 20 d litter weight, weaning litter weight while the Yorkshire × Barnei showed the lowest heterosis in some traits or no heterosis in some others traits.