Abplanalp H, Okamoto S, Napolitano D, Len R E
Poult Sci. 1984 Feb;63(2):234-9. doi: 10.3382/ps.0630234.
This study was designed to estimate heterosis and recombination loss of feed efficiency at peak egg production using six inbred White Leghorn lines and their crosses. Percent hen day egg production was highest in three-line crosses with 94.6%, 93.5% for two-line crosses and 91.0% for inbred lines, respectively. Feed efficiency of three-line crosses was superior to that of two-line crosses, primarily because of low feed consumption. Heterosis effects for body and egg weights were observed in all mating combinations. The value of heterosis for egg number and feed efficiency were dependent upon parental line. Egg number and egg weight showed small average recombination losses, depending on lines involved. Small but consistent recombination loss for body weight was observed. The recombination loss for feed efficiency was large and negative; the highest three-line cross value for this trait was about 16% above that of the mean of the corresponding two-line crosses.
本研究旨在利用六个近交白来航品系及其杂交组合，估计产蛋高峰期饲料效率的杂种优势和重组损失。母鸡日产蛋率在三系杂交中最高，为94.6%，两系杂交为93.5%，近交系为91.0%。三系杂交的饲料效率优于两系杂交，主要是因为饲料消耗低。在所有交配组合中均观察到体重和蛋重的杂种优势效应。产蛋数和饲料效率的杂种优势值取决于亲本系。产蛋数和蛋重的平均重组损失较小，具体取决于所涉及的品系。观察到体重有小但一致的重组损失。饲料效率的重组损失很大且为负值；该性状的最高三系杂交值比相应两系杂交均值高约16%。
