That's a very good question.
The rules and regulations for the transport of horses by air—frankly, just the transport of horses—are not different depending on what the horse is going to be used for.
The requirements for a horse to be transported to another country for the purpose of a feedlot or food production are not different from the requirements for a horse being transported by air, for example, to an athletic event. The feed, water and rest time, or the interval at which an animal must be provided rest, feed and water during transport, is 20 hours regardless of the outcome for that animal.