M. Debonne

TL;DR: Improved management strategies provide an alternative in dealing with the negative effects caused by a delay in feed access, and the development of pre-starter diets that better meet the needs of the newly hatched chicks or in ovo feeding to bridge the gap between hatch and first feeding are discussed.

TL;DR: It is clear that higher levels of CO(2) during the first ten days of incubation have persistent (epigenetic) effects during the incubation and early post-hatch period.

TL;DR: The hatching system had minor effects on hatchling physiology and that posthatch growth and livability were not affected, and it seems important to take hatching time into account in future studies related to Hatchling physiology.

TL;DR: It is concluded that nonventilation during the first 10 d of incubation had a stimulatory effect on embryonic development of the 2 broiler strains with no effect of heart weights but with effects on hormone levels, air cell pressures, and hatching parameters.

TL;DR: Embryonic growth was modestly accelerated, reflected in higher embryonic weights at day 6 and 10 and a significant earlier hatching; hatchling weights were not different between treatment groups, and the capacity of albumen to cope with higher environmental CO2 was illustrated.