Beraisa: If a chick hatched on Yom Tov it is permitted, as it permits itself through slaughtering.

Question (Beraisa): 'Eggs that have partially formed chicks (where the blood vessels already formed), or chicks upon which wings have not yet fully grown - both are prohibited because they are a Sheretz (repulsive creatures) and one would not receive lashes for eating them because of the prohibition of Neveilah (as they are not yet considered chicks)'. R. Chagai said - this means that they are prohibited even if he slaughtered them (so how can a chick that hatched be immediately permitted through slaughtering?!)

Answer: The first Beraisa is discussing a case when they already had wings.

R. Abahu quoting R. Yosi bei R. Chanina: Any creature that mates in the day gives birth in the day; any creature that mates at night gives birth at night.

Question: A hen mates in the day but lays eggs both in the day and at night?!

Answer (R. Abun): Because it can lay eggs without mating.

R. Zeira quoting Gidul: A calf that was born from a Tereifah on Yom Tov may be eaten - it is viewed like a non-Muktzah item hidden inside a Muktzah item.