Roaching (USA) or Hogging (UK)
Roaching or hogging is when the mane, and sometimes forelock, is completely shaven. This is usually done if a horse's mane is quite ragged, or for certain disciplines such as polo, polocrosse, and calf roping, to keep the mane out of the way. Cobs can be shown with a roached mane and it is also common to roach the mane for certain breeds. In Spain, breeders commonly roach the mane of mares and foals. The same applies to the Swiss "Freiberger" horses. The American Saddlebred "3-Gaited" horse is often shown with a roached mane, while the "5-Gaited" Saddlebred is shown with a full mane.
If a mane is roached, it will take about 6–8 months for it to stop sticking straight up in the air and lay over onto the neck, and a year or more to return to a natural length. For this reason, manes that are roached usually need to be kept that way, though occasionally roaching a damaged mane and allowing it to grow out evenly is effective as a last resort for a mane that has been partly torn out, badly tangled or otherwise cannot be restored to a smooth condition.
Read more about this topic: Mane (horse)