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For mine, the noticeable dip happened on Day 27 (hardly any fluid could be seen within the egg), all veining had disappeared and the line between the chick and the air cell "formed" into the shape of the chick, creating a more uneven line (unlike the even ones you see during earlier...
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It has been done before!
Although a (chicken) hen cannot cover as many eggs as a goose or a Muscovy hen.
And she would need to be covering goose eggs entirely... the hatch times of chickens and geese vary greatly.
If the chicks hatched on time, she would likely abandon the goose eggs...