What is the purpose of using stocks in horse handling?

Using stocks in horse handling primarily serves to restrict movement for medical treatment. When a horse is placed in stocks, it is safely contained, allowing for better control and minimizing the risk of injury to both the animal and the handler. This restraint is particularly beneficial during procedures that require the horse to remain stationary, such as veterinary examinations, vaccinations, or minor surgeries. The use of stocks ensures that the horse cannot move around excessively, which helps veterinarians perform procedures efficiently and safely.

The other options do not align with the primary purpose of stocks. While stocks do not enhance performance, teach commands, or improve diet, their main function is focused on ensuring the horse's safety and that of the handler during necessary medical interventions.