Could you please clarify the context of the question "What bit should you start a horse in?" as it seems to be a bit of an unconventional phrasing? However, I'll assume you're asking about what type of bit is most suitable for a horse that is just starting its training.
When it comes to choosing a bit for a horse that is just beginning its training journey, it's essential to consider the horse's individual needs, temperament, and mouth sensitivity. A gentle and mild bit is often recommended for horses that are still learning the basics of bit pressure and communication with the rider.
Some popular options for beginner horses include the snaffle bit, which is a simple, non-severe bit that allows for gentle control and communication. It's designed to encourage the horse to respond to the rider's signals without causing discomfort or pain.
Another option could be a curb bit, but it's important to note that these bits are typically used with more experienced horses and require a delicate touch to avoid causing discomfort.
Ultimately, the best bit for a beginner horse will depend on the horse's individual needs and the training methods being used. It's always a good idea to consult with a qualified horse trainer or veterinarian to ensure that the bit chosen is appropriate for the horse's needs and temperament.