twisted: The ruling of the Chazon Ish on the zebu is not so simple. The Chazon Ish did not rule that a zebu can’t be eaten no matter what. He only responded to a ruling from Rabbi Herzog zt”l. R’ Herzog wrote that we do not require a mesorah on new animals, and therefore a zebu can be eaten. The Chazon Ish wrote that he disagrees, and if the zebu is a new animal, we shouldn’t eat it because we do require a mesorah.
The question is, what defines a new animal? Many scientists regard the zebu as being the same as regular cattle, and even call it by the same species name.
The other question is when do we require a mesorah? For a new animal we’ve never seen before is one thing. But a beefalo is not a regular animal. It comes from 2 animals, and we have a mesorah on each of them. Does the mesorah get passed down to their offspring?
This is not a question for people here. This should be decided by a knowledgeable Rav.