Related for Beitzah 4:5
להודיעך כחן דבית שמאי דבנולד שרי
[The Mishnah is framed as about the egg] in order to show you the strength of Beit Shammai['s position] that they permit [even] nolad.
Tosefta Beitzah (Lieberman)
If one slaughters a hen and finds eggs in her, although they are already ready, they are permitted.
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Tosefta Beitzah
One who slaughters a chicken [on Yom Tov] and found fully developed eggs inside of it -- behold, they are permitted.
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