Chulin 4:6-7

Chulin 4:6

If an animal’s legs were severed below the knee, it remains kosher; above the knee, it is no longer kosher. The animal is also a treifa if the joint of the sinews is gone. If the bone was broken below the knee and the majority of the flesh remained, then slaughter renders it fit to eat; if not, then slaughter does not render it fit to eat.

Chulin 4:7

If a person slaughtered an animal and found a placenta in it, whoever is so inclined may eat it. It is not susceptible to ritual impurity, neither as food (since it’s not considered food) nor as a neveila (since it’s not considered flesh). If one had the intention to eat the placenta, then it is susceptible to food impurity but not to neveila impurity. If part of the placenta came out before the animal was slaughtered, it may not be eaten since the placenta’s emergence is a sign of giving birth in both humans and animals. If an animal was pregnant for the first time and it expelled a placenta (so that’s the first issue of its womb), it may be thrown to the dogs (because it doesn’t have the sanctity of firstborn animals); if a consecrated animal expels a placenta, it must be buried. It may not be buried at the crossroads nor hung on a tree because these are sorcerous practices of the Emorites.