While they are documented to prey on feral horses in Alberta, Canada, there is no known documentation of wolf predation on free-roaming horses in the United States. There are strict guidelines for techniques used to round up mustangs. Allowing livestock to graze year-round is not good for the range, and so mismanagement of feral herds can also degrade the range for the wildlife that shares the same area. One example is a promotional competition, The Extreme Mustang Makeover, that gives trainers days to gentle and train mustangs, which are then adopted through an auction. Turning compression on slows down StaticVarSet as it needs to do some extra processing , but does not affect performance of other functions, so StaticVarGet is equally fast with or without compression. From 75 horses in his original expedition, he expanded his herd to , and from there the horse population increased rapidly. Government, then two stacked figures indicating the individual horse's date of birth, then the individual registration number.