What kind of whistle is used for training pigeons?

Training pigeons is better to use special training pigeon whistle.Before the training, put the pigeon in the pigeon shed for a day, so that the pigeons were in a state of hunger, which is more conducive to whistle training.Before feeding the pigeons the next day, blow off the whistle and feed.Seven -point full every time, repeat for a week, allow pigeons to reflect the condition between eating and whistle.In addition, let the pigeons fly on an empty stomach, and use the whistle to guide the pigeons back to the nest when Jiafei.