Commentary for Beitzah 4:12
ומי גזרינן והא תניא השוחט את התרנגולת ומצא בה ביצים גמורות מותרות לאכלן ביום טוב ואם איתא ליגזר משום הנך דמתילדן ביומיהן
"But really there's a [rabbinic] decree?! Is it not taught [in a baraita]: 'One who slaughters a chicken [on Yom Tov] and finds in it complete eggs – they are permitted to eat on Yom Tov'!? If this were valid, let them decree because of this that [when] they are laid [lit. born] on their day [they should be permitted]!" [I.e. Rabbah, your assertion that it's forbidden because of a decree would surely apply in the case of finding an egg inside a chicken, but it does not! We should decree the other way that all eggs should be permitted on Yom Tov!]
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