Zelenka D J, Siegel P B, Van Krey H P
Br Poult Sci. 1986 Sep;27(3):409-14. doi: 10.1080/00071668608416897.
The production of double-yolked eggs and the duration of the rapid growth phase of yolks were measured in parental lines of White Plymouth Rock pullets and their crosses over 30 d, commencing with the day of first egg. Significant differences were found between mating combinations in the incidence of multiple-yolked eggs, but not in the period of rapid yolk growth. Heterosis and recombination effects for multiple ovulation were respectively -9% and -66% of the mean, while the corresponding values for the period required for rapid yolk growth were -1% and -5%. Three double-yolked eggs were observed containing yolks which differed by 3 d in their periods of rapid growth. Hypotheses are were presented for the origin of double-yolked eggs.
从首次产蛋日开始，在30天内对白普利茅斯洛克母鸡的亲本品系及其杂交后代的双黄蛋产量和蛋黄快速生长阶段的持续时间进行了测量。在多黄蛋的发生率方面，不同交配组合之间存在显著差异，但在蛋黄快速生长阶段的时长方面不存在显著差异。多排卵的杂种优势和重组效应分别为平均值的-9%和-66%，而蛋黄快速生长所需时间的相应值分别为-1%和-5%。观察到三个双黄蛋，其蛋黄的快速生长阶段相差3天。文中提出了关于双黄蛋起源的假说。
