The waiting times to first births were collected in the population of Isle-aux-Coudres, Quebec. The monthly probabilities of fertility in first marriages of consanguineous and non-consanguineous couples were computed and fitted by a beta distribution in order to estimate the mean and variance of fecundability. Consanguineous couples were prone to less intra-uterine mortality in the first days following conception. Otherwise, they experienced a higher late intra-uterine mortality. At birth, non-consanguineous couples had had, however, more fetal deaths. It is also suggested that variation in the sexual behavior could account, more than intra-uterine mortality, for differences in natural fertility between populations.
"Genetics of Fecundity: A Demographic Approach,"
1, Article 4.
Available at: https://digitalcommons.wayne.edu/humbiol/vol49/iss1/4