Ol' George wrote in part:
"...If a hen has been brooding them I would say 3 days or you can tell the kids they don't
have to eat the feet. I think eggs have to reach a critical temperature
before they start to develop. I believe it's up around 100 deg F."
have to eat the feet. I think eggs have to reach a critical temperature
before they start to develop. I believe it's up around 100 deg F."
*** 15 ***
Hi George:
You're essentially correct in your thinking, here is some detail:
Given an egg is fertile the embryo actually begins to develop while still in the chicken for the 20-23 hrs. it's passing through the oviduct, thus at the time of lay the embryo has actually gone through several cell divisions and the cellular structures which will become discrete tissue are well differentiated.
The development time within the hen's body accounts for up to 4.5% of the total incubation time of 22 days - 1 day in the bird and 21 days under incubation by either natural or artificial means.
Under normal circumstances after laying the egg cools from the hen's 105 -107 F (40.5 - 41.6 C) internal body temperature and cell division slows, stopping completely below 64 -60 F (17.7 - 15.5 C).
Incubation, albeit less than optimum, resumes around 75 F (23.8 C)
Prof.
*** 30 ***
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