text: The terms for the male of a given animal species ( stallion , bull , rooster , etc. ) usually imply that the animal is entireâ '' that is , not castratedâ '' and therefore capable of siring offspring .
simplified: The terms for the male of a given animal species ( stallion , bull , rooster , etc. ) usually mean that the animal is entire , that is , not castrated , and therefore capable of standing at stud .