Egg turning should be undertaken 3-6 times per day and an uneven number of rotations are better so that the eggs are not in the same position for a longer period. The turning process allows the embryo to revolve and slide in the inner white and provides access to additional nutrients for embryonic development. This phenomenon of adherence to the shell membrane commonly occurs during fertile egg storage and during early incubation (generally the first week). The hatched chick is most susceptible to oxygen deviation (compared to the pipped chick and the embryo in the intact egg), which implies that ventilation rate and carbon dioxide concentration is most critical in the late phase of incubation.Įgg rotation or turning is required to ensure that the embryo developing on the yolk does not adhere to the shell membrane. The normal atmosphere contains 21% oxygen and 0.04% carbon dioxide. Ventilation and Carbon Dioxide/Oxygen ConcentrationĮmbryonic growth is optimised at an air concentration of carbon dioxide of 0.4% and embryonic growth is depressed and mortality increased with carbon dioxide concentrations above 1%. ![]() ![]() These parameters can be easily achieved and maintained if the incubator manufacturer’s operating instructions are carefully adhered to.
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