For the source text click/tap here: Bechorot 12
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One cannot use the following to redeem a firstborn donkey: a calf, a wild animal, a slaughtered animal - even a slaughtered sheep, a sick animal - terefah, a hybrid - even an offspring of a male goat and a female sheep, or a koy - an offspring of a deer and a goat. Rabbi Eliezer allows redemption with a hybrid, because both a goat and a sheep separately can be used.
Can we redeem a firstborn donkey with a live fetus found in a womb of a slaughtered sheep? Is it a live sheep, good for a redemption, or, since it does not require proper slaughter, it is considered as meat already slaughtered, not valid for redemption? Can one use a mutant - an animal that is like a different species? Is it close enough to hybrid, which is forbidden?
We explore animals and animality thanks to the work of Beth Berkowitz.