Can a בכור be determined to have had a blemish even after its death?
Halacha: If the hair of a firstborn animal with a blemish fell off and was placed on a window sill by the owner, there is a disagreement about whether one may benefit from the hair after the animal is slaughtered.
חטאת has hairs that fall of before it is slaughtered. They may not be used.
עולה that is blemished has hairs that fall of. They may not be used.
בזמן הבית when is a בכור given to the כהן?
Now when is a בכור בעל מום goat given to the כהן?