Personally I only use in aid off stripping off the excess fat before breeding. I can understand the guys that use it to help knowing when they have been fed enough. Have also read about widowhood guys using it too break the cocks down at the start off the week again each to there own.. In no way do I favour giving it to youngsters to help them fly better. Imo if you have to give them barley to fly or exercise better then something is not right.