I am having problems introducing new pullets to my flock. They are free range during the day and get cooped up at night. I purchased five new pullets and my guineas do not want to accept them. The guineas do not roost with the chickens. They will chase a new one and gang up on it and try to beat it up. Has anyone had this type of experience? They were raised with the current chickens I have, all from day old. I hate to keep them penned up forever.