Breuer H W, Claussen U
Anat Embryol (Berl). 1977 Aug 9;151(1):91-5. doi: 10.1007/BF00315301.
The empirical coefficient of correlation and the empirical coefficient of regression were evaluated in New Zealand White rabbits between birth weight and crown-rump on the one hand and number of implantations and litter size on the other. The average birth weight decreases with increasing litter size (P = 0.01). The decreased supply of blood to the single fetus in big litters might be responsible for this result. As no definite correlation between crown-rump and litter size could be proved, the conclusion may be drawn that the crown-rump is more determined by genetic factors than is the birth weight.
在新西兰白兔中，一方面评估了出生体重与顶臀长之间的经验相关系数和经验回归系数，另一方面评估了着床数与窝仔数之间的经验相关系数和经验回归系数。平均出生体重随着窝仔数的增加而降低（P = 0.01）。大窝仔中单个胎儿的血液供应减少可能是导致这一结果的原因。由于无法证明顶臀长与窝仔数之间存在明确的相关性，因此可以得出结论，顶臀长比出生体重更受遗传因素的影响。
