INCUBATING w/FRIENDS! w/Sally Sunshine Shipped Eggs No problem!

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@Sally Sunshine
Is there a time frame where I should get worried of I don't see an external pip
). Furthermore, high ambient CO2 can cause higher blood and air cell pCO2 in the early stage of incubation (De Smit et al., 2006; Bruggeman et al., 2007). Up to d 19, oxygen supply occurs only via blood circulating through the chorioallantoic membrane (Mortola, 2009). From d 19 to 20, however, the chick pierces the air-space membrane of the egg with its beak (internal pipping), which allows pulmonary respiration to begin. Thereafter, until hatching is complete at about d 20 or 21, oxygen supply occurs via both the chorioallantoic membrane and the lungs. The oxygen contributed via the chorioallantois declines to low levels during this period, but the pulmonary contribution compensates with a 1.5- to 2-fold rise. This is aided at approximately d 19 or 20 by the chick penetrating the eggshell with its beak (external pipping) and thereby gaining access to atmospheric air. There needs to be an overall balance between delivery of oxygen by these means and an increase in oxygen demand by the chick as it grows, as well as the marked increase in demand associated with prehatching and hatching behavior (Menna and Mortola, 2002; Mellor and Diesch, 2007).
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