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A synchronized birth is important for any species that produces many offspring in a clutch or litter as it creates an ideal environment for survival. Altering the environment of a developing organism might change the developmental trajectories of some physiological regulation systems and may alter the time of hatching and may also subsequently affect the characteristic maturity or quality of the young during the first few days’ life (Tzschentke and Plagemann, 2006). For chicks, it is believed that simply reducing HW and forcing chicks to hatch without being well-developed may have a negative effect on chick quality and subsequent performance. Therefore, to achieve better chick quality and welfare, optimal incubation conditions have to be applied and the embryo response has to be considered. Besides incubation conditions (temperature, humidity, gas pressure) and embryonic physiological parameters, Figure 2.The 3,3′,5-triiodothyronine (T3), thyroxine (T4), and corticosterone (CORT) concentration (ng/mL) in plasma from 11-d-old embryos to newly hatched chicks (Scott et al., 1981; Reyns et al., 2003; Sechman et al., 2006). IP = internal pipping; H = hatch.625 REVIEWby guest on November 2, 2015 http://ps.oxfordjournals.org/ Downloaded from other environmental factors are also important to de-termine the actual hatching times, such as order of ovulation, thermal microenvironments of eggs in incubation period, and intraclutch communication.It is possible to manipulate environmental conditions to change circulating hormone levels that lead to an optimal hatchability and HW. To create an incubation system that will automatically lead to synchronized hatching, some key factors should be considered: 1) preincubation conditions; 2) incubation conditions; 3) maturity and sensitivity of embryo functional system; 4) the period and features of external stimuli; and 5) species-specific ability to synchronize. Combination of incubation conditions and microenvironment of eggs might be a way to achieve ideal flock uniformity.
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