I have a mother penhen with two lovely peachicks. They are now six weeks old and are big and healthy. They follow their mother around their large enclosure in the barn. I have been leery of letting them out into the big world because we lost a couple peachicks last year. One fell in the stock tank and drowned and the other I think was eaten by a barn cat. Any advise on when its ok to open the door and let their momma raise them out in the barn yard?