Rif Beitza 1a {Beitza 2a - 3b}

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{Beitza 2a}
Mishna:
An egg which was laid on Yom Tov:
Bet Shammai say: It may be eaten.
And Bet Hillel say: It may not be eaten.

Bet Shammai say: Leaven {=sourdough} in an olive's measure {must be removed for Pesach} and chametz {which has become leavened via sourdough} the size of a date.
And Bet Hillel say: Both this and that with an olive's measure.

Gemara:
With what are we dealing?
If you say with a hen which stands to be eaten, what is the reason of Bet Hillel?! It is food which {merely} splits. But if with a hen which stands to produce eggs, what is the reason of Bet Shammai?! It is muktzeh {since it was not muchan, prepared, from before}!

{Beitza 3b}
And Rabba establishes as as dealing with a hen which stands to be eaten, and we are dealing with a case of Yom Tov which falls after Shabbat, and because of a problem of hachana. And Rabba maintains that any egg laid now was finished yesterday.
Rabba is consistent, for Rabba said {Shemot 16:5}:

ד וַיֹּאמֶר ה אֶל-מֹשֶׁה, הִנְנִי מַמְטִיר לָכֶם לֶחֶם מִן-הַשָּׁמָיִם; וְיָצָא הָעָם וְלָקְטוּ דְּבַר-יוֹם בְּיוֹמוֹ, לְמַעַן אֲנַסֶּנּוּ הֲיֵלֵךְ בְּתוֹרָתִי אִם-לֹא.	4 Then said the LORD unto Moses: 'Behold, I will cause to rain bread from heaven for you; and the people shall go out and gather a day's portion every day, that I may prove them, whether they will walk in My law, or not.
ה וְהָיָה בַּיּוֹם הַשִּׁשִּׁי, וְהֵכִינוּ אֵת אֲשֶׁר-יָבִיאוּ; וְהָיָה מִשְׁנֶה, עַל אֲשֶׁר-יִלְקְטוּ יוֹם יוֹם.	5 And it shall come to pass on the sixth day that they shall prepare that which they bring in, and it shall be twice as much as they gather daily.'