I have 6 chickens/pullets all different ages oldest 19 weeks youngest 6 weeks. All get along just fine all sleeping in the coop together. The oldest pullet is going to become a hen soon and I want to feed her Layena Plus Omega 3. It would be hard to feed just her that. I was told not to feed the other chickens that feed because they are not old enough. My question is why? And does anyone here recommend Layena Plus Omega 3? Thanks.