What is the practical difference between nebelah and terefah?

Question

The second mishna on Chullin 32a explains that if an animal is rendered invalid by any death which does not occur through proper ritual slaughter it is nebelah while if it is rendered invalid for some other reason it is terefah. My question is: what are the consequences of an animal having one of these statuses versus the other? You can't eat it either way, obviously; are there differences in what benefit you can derive from it? What are they, and which is the more severe disqualification?

Answer 1

As far as I know, the above answer is correct. A neveilah conveys ritual impurity, while a treifa does not; as per the gemura in Niddah on 42b, which makes a drasha from the pasuk in Vayikra 22:8.

Here is a direct link: http://www.hebrewbooks.org/shas.aspx?mesechta=37&daf=42b&format=pdf it is about 3/4 of the way down the daf.

Answer 2

A neveilah is tamei (ritually impure); a treifa isn't. Benefit is permitted either way.

Answer 3

Nebelah: An animal that has died a natural death or was killed not in accordance with the jewish ritual lawnatural death is called "nebelah" (carcas). (Bechoros, 3a)

Terefah: An animal afflicted with an organic disease or disability (eg. the removal of a certain portion of the knee) (Chulin, 42a)

A first-born-Nebelah can have kedushat-Bechor and needs to be redeemed from a Kohen. If it is terefah it loses its Bechor-status and doesn't need redeeming.

According to Rav Hisda, if, when it died, a non-Jew owned any of the parts of the Nebelah that would render the animal treif if that part was missing (eg. windpipe), then the animal is unfit to be a Bechor, and doesn't need to be redeemed. (Bechoros, 3a)