Input (grade 9): The terms for the male of a given animal species (stallion, bull, rooster, etc.) usually imply that the animal is entire - that is, not castrated - and therefore capable of siring offspring.
Output (grade 8): 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.