We learned: A chick that hatches on Yom Tov, Rav: It is forbidden. Shmuel or perhaps Rabbi Yochanan: It is permissible.Rav Kahana and Rav Asi to Rav: Why is this chick different from a calf born to a treifah [whose mother is muktzeh] on Yom Tov?Rabbah or perhaps Rav Yosef: Rav could have said that a treifah is also muchan - for dogs.Abayye to Rabbah or perhaps Rav Yosef: Something muchan for humans is not muchan for dogs, so why would you assume that something muchan for dogs becomes muchan for humans?
Rabbah or perhaps Rav Yosef to Abayye: True. Something muchan for humans is not muchan for dogs, because he would never cast to the dogs something he can eat himself. But something muchan for dogs becomes muchan for humans because it is useful to us.
The opinions of both Rav and Shmuel or perhaps Rabbi Yochanan are supported by Beraisas:A Beraisa in support of Rav: A calf born on Yom Tov [presumably even to a treifah] is permitted, a chick hatched on Yom Tov is forbidden. The calf becomes muchan together with its mother by shechitah, but an egg is unaffected by its mother’s shechitah.A Beraisa in support of Shmuel or perhaps Rabbi Yochanan: A calf born on Yom Tov is permitted, a chick hatched on Yom Tov is also permitted. The calf becomes muchan together with its mother by shechitah, and the chick’s muktzeh status is broken since it can now become permissible by shechitah.
Beraisa:A chick born on Yom Tov is forbidden. Rabbi Eliezer ben Yaakov: It is also forbidden on a weekday, because it has not yet opened its eyes.
Beraisa: “Every creepy thing that creeps on land” includes also chicks who have not yet opened their eyes.This is in accordance with the opinion of Rabbi Eliezer ben Yaakov.
Rav Huna quoting Rav: An egg is finished when it comes out.
Question: What is meant by that statement? Does it mean that at that point it loses its status as meat and becomes permissible to eat with milk? We learned a Beraisa: One who discovers finished eggs inside a chicken that he slaughtered, may eat them with milk [according to Rashi even if a shell has not formed yet].
Suggestion: Perhaps it means that once it is laid, it is permitted to be eaten on Yom Tov, but if it is found in the slaughtered body of its mother, it would be forbidden to eat on Yom Tov.
Rejection: But we learned in a Beraisa: One who slaughters a chicken and finds completed eggs inside of it may eat them on Yom Tov.
Suggestion: Perhaps our Mishna (001) holds that even an unborn egg is forbidden on Yom Tov, and this Beraisa argues and permits it.
Rejection: The Mishna clearly only discusses an egg laid on Yom Tov, but would certainly permit an egg found inside its mother. 
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