Embryonic Mortality and Malpositions in Fayoumi Chicken

DESPITE the precautions undertaken to secure better hatchability, some eggs fail to hatch. Such eggs represent a great loss for both hatchery men and breeders. This experiment was done to study embryonic mortality and malpositions in Fayoumi. REVIEW OF LITERATURE A. Embryonic Mortality. Embryonic mortality occurs at any time from fertilization up to the time of hatching. Payne (1919) found that there was two peaks of embryonic mortality and reported that 65 percent of all embryonic mortality occurs between the fourth and the sixth day of incubation. In contrast, Byerly (1930) found that the first peak occurred on the third day of incubation. Byerly et al. (1934) reported that there was a minor peak at about the seventh day of incubation. Later on, they found another peak in the middle of the incubation period, which was related to nutritional deficiencies in the diet consumed by the flock. They also reported …