The gaseous environment of the chick embryo in relation to its development and hatchability. 1. Effect of carbon dioxide and oxygen levels during the first four days of incubation upon hatchability. Poultry Sci

EXPERIMENTS exposing hatching eggs from the 193rd through the 288th hrs. of incubation were conducted in con-tinuation of a program of testing the effect of various C02 and 0 2 levels upon em-bryonic development and hatchability. Pre-vious reports (Taylor et al., 1956; Taylor and Kreutziger, 1965) have dealt with re-sults from two earlier periods of such treat-ments. While optimum gaseous conditions for hatching have been discussed in the litera