title: Correlation of birth weight and crown-rump to the number of implantations and litter size in rabbits.
abstract: 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.
mesh_terms: D000818:Animals; D001699:Biometry; D001724:Birth Weight; D010064:Embryo Implantation; D005260:Female; D008098:Litter Size; D008433:Mathematics; D011247:Pregnancy; D011817:Rabbits / Q000033:anatomy & histology*