Status of an animal which is sanctified as a fetus, and then is born via Caesarean Section: Temurah 17a Substituting an animal which was born via Caesarean section for an offering, or substituting an animal for an offering which was born via Caesarean section after having been sanctified as a fetus: Temurah 11a, 17a
What happens if such an animal is mixed up with eligible offerings: Temurah 28a
What happens if such an animal is placed on the mizbeiach: Zevachim 27b