Bullock.
When castrated he will be called a steer no matter how young.
It's called a steer.
A steer is a castrated male bovine (or bull) that is raised for meat. An ox is a castrated male bovine (can also be female too) that is trained and used for pulling carts, wagons, plows, etc.
Dairy males are called bulls if intact and steers if castrated.
A castrated male bovine is commonly referred to as a steer. Steers are male cattle that have been neutered, typically for better temperaments and improved meat quality. Castration is usually done when the animal is young to minimize stress and complications.
A male horse castrated before reaching sexual maturity is called a gelding. A male horse that is sexually mature is called a stallion.
A bull is an intact (non-neutered) male bovine, and a steer or bullock is a castrated male bovine.
A young steer is called a bullock. It is a young male bovine that has been castrated.
A steer if referring to a castrated bovine raised for beef, or an ox if referring to a castrated, usually horned bovine used for draft.
A beef cow or a beef steer (castrated male bovine).
Bullocks, a European term for a castrated male bovine, can be slaughtered and eaten.
A castrated male cat is usually just called a "neutered" or "fixed" male.