I have (3) Eleven-Week old chickens and I just bought some scratch and BOSS to give them as a treat. From what I have read mixing BOSS with the scratch will raise the protein value which is better for them at a young age. What ratio of BOSS to Scratch would be best for them now? What ratio would be best once they start laying? The Scratch I have has the following properties: Crude Protein - at least 10% Crude Fat - at least 3% Crude Fiber - no more than 5% They are in a Tractor so have access to fresh grass and Starter Crumbles at all times.