[If] a cow bore something resembling a donkey, or [if] a donkey bore something resembling a horse, it is exempt from bechor laws; as it is stated (Exodus 13:13, 34:20): The firstborn of a donkey, The firstborn of a donkey, twice —- until the bearer is a donkey and the offspring is a donkey.  What is their status in regard to eating? [If] a kosher animal bore something resembling an unkosher animal, it is permissible for eating; but [if] an unkosher animal bore something resembling a kosher animal, it is forbidden for eating; for whatever comes out of something unkosher is unkosher, and whatever comes out of something kosher is kosher. [If] an unkosher fish swallowed a kosher fish, the kosher fish is permissible for eating; but [if] a kosher one swallowed an unkosher fish, it is prohibited for eating, because this is not its growth.