Gas exchange and hatchability of chicken eggs incubated at simulated high altitude.
Chicken eggs laid at sea level were incubated at sea level (control conditions), at a simulated altitude of 5.5 km without any further measures (natural conditions), and at a simulated altitude of 5.7 km at optimal incubator gas composition (optimal conditions). Under optimal conditions the incubator relative humidity was 70% throughout incubation, the gas mixture supplied to the incubator contained 45% O2-55% N2, and the ventilation rate was reduced to 6% of control in order to maintain the normal air-space gas tensions and to compensate for the increased eggshell conductance at altitude. The embryos that developed under control conditions showed a normal CO2 production with 94% hatchability of fertile eggs. Under natural conditions at altitude all embryos died within a few days. Optimal conditions resulted in an almost normal gas exchange and in an improvement of hatchability from 0 to 81% of fertile eggs.
D000531:Altitude; D000818:Animals; D002245:Carbon Dioxide / Q000502:physiology*; D002642:Chick Embryo / Q000502:physiology*; D006813:Humidity; D007185:Incubators; D009584:Nitrogen / Q000502:physiology*; D010100:Oxygen / Q000502:physiology*
D002245:Carbon Dioxide; D009584:Nitrogen; D010100:Oxygen