As a Creature of its own breed: Yuma 74b
Eating its Forbidden Fats and Blood: Yuma 74a-b
Its status, in terms of its inclusion in certain categories in the event of certain vows: Nedarim 18b Covering its blood after it is killed: Beitzah 8a-b Slaughtering a koy on Yom Tov: Beitzah 8a-b
Concern that if one covers a Koy's blood, people will assume its fat is permitted, since one may eat the fats of those animals for which blood-covering is a requirement: Beitzah 8b
