[en] This study concerns 20,654 ostrich eggs observed from lay to hatching at 55 Belgium farms from 1998 to 2000. The effects of various management and genetic factors that influence fertility and hatchability were studied using a multivariate logistic regression. The eggs age at setting, the season of lay, the type of breeding mating and the farm have the most influence on fertility, while egg weight loss during incubation and hen age were most influential on hatchability. Other factors of lesser importance, like breed and egg weight before setting, also contribute to the variations of the both factor. Mean ± SE egg weight at setting was 1526.8 ± 148.2 (range 975-2285g). Average fertility and hatchability were 69.4 ± 46.0 and 72.9 ± 44.4% respectively. Fertility of eggs is high until eight days of storage, and then decreased gradually thereafter to reach the minimum on the 19th day. Fertility and hatchability are low in winter; mating in groups gives a better result than either trio or quintet matings. Strong linear relationships were observed between age of hen and fertility (r=0.9) and for age with hatchability (r=0.76). Hatchability is high for egg weight loss of 13 and 15%, and the largest eggs show good fertility and hatchability. Eggs from black necks were the most representative in this work, but they have a lower fertility and hatchability than those from blue and red necks.