Institute of Animal Breeding and Genetics, University of Göttingen, Albrecht-Thaer-Weg 1, W-3400, Göttingen, FRG.
Theor Appl Genet. 1991 Jul;82(1):65-73. doi: 10.1007/BF00231279.
Results are presented from two replicated three-breed cross diallels that were conducted after 20 generations of selection for purebred performance in mice. The selection criteria for the different lines were: litter size at birth (LS), weaning weight at 4 weeks (WW), weight gain from week 4 to week 6 (WG), and body fat content at week 6 (FT). Additionally, a random-mating control line (C) was kept. Significant maternal heterosis was found in litter size and weaning weight. Estimates of maternal heterosis in litter size were very high, ranging from 17 to 50% of the mean of the corresponding single crosses. Maternal heterosis in weaning weight usually was negative and ranged from +9 to -11%. Significant maternal heterosis in feed efficiency and weaning weight could only be found in a few cases. Total performance of three-breed crosses was highly superior to that of single crosses and purebreds. Means of the corresponding purebreds or single crosses were of little use in predicting three-breed cross performance.
结果来自于两个经过 20 代选择的三品种杂交重复试验，选择的标准为：出生窝仔数（LS）、4 周龄断奶体重（WW）、4 到 6 周体重增加（WG）和 6 周体脂含量（FT）。此外，还保留了一个随机交配的对照组（C）。我们发现出生窝仔数和断奶体重存在显著的母本杂种优势。出生窝仔数的母本杂种优势估计值非常高，范围从相应的单杂交平均值的 17%到 50%。断奶体重的母本杂种优势通常为负，范围从+9%到-11%。只有在少数情况下才能发现饲料效率和断奶体重的显著母本杂种优势。三品种杂交的总体性能远优于单杂交和纯种。相应纯种或单杂交的平均值在预测三品种杂交性能方面用处不大。
