Final answer:
The bloodless dehorning method uses a Heated iron to cauterize the horn buds on young calves, preventing horn growth and reducing the risk of bleeding and infection.
Step-by-step explanation:
The instrument used to perform bloodless dehorning is a Heated iron. This method involves using a hot iron to cauterize the horn-producing cells in the horn buds of young calves, preventing the horns from growing. It is a preferred method as it is generally less traumatic and has a lower risk of bleeding and infection compared to other dehorning methods. However, it's important to note that dehorning, even when performed bloodlessly, can still be a stressful procedure for the animal, and proper pain management practices should always be followed.