A Stud is a male llama who is used to breed females. He can also be called a herdsire.
I think he is called a hembra.
A castrated male llama is typically referred to as a gelding. This term is commonly used in livestock management to describe a castrated male animal.
A human adult male is called a man.
A male llama and a female llama.
An adult male is called a Boomer.
An adult male pig is called a boar, while an adult female pig is called a sow.
Male carabou are called bulls.
An adult male Zebra is called a stallion.
A male bear is called a boar.
A young girl horse is called a filly, and a young male is called a colt. An adult female is called a mare, and an un-castrated adult male is called a stallion. A castrated adult male is called a gelding.
I heard that it is is sometimes called a macho.
Female rabbits are called does, and males are bucks.