Here's why:
* Bison aren't typically kept as pets: Unlike some domesticated animals, bison are large, powerful, and have specific needs. They are usually kept for conservation or ranching purposes.
* Neutering wouldn't change their behavior significantly: While neutering can reduce aggression in some animals, it wouldn't drastically alter the behavior of a bison, which is already a herd animal.
* It's not necessary for conservation: Bison are typically managed in controlled environments for conservation, so neutering is not necessary for population control.
So, while there's no special name for a neutered bison, you could simply refer to it as a "neutered bison," or perhaps "sterilized bison" for clarity.