There are times when the least cost formulations used for commercial production flocks are not the best for longer lived flocks maintained under more varied conditions for a broader range of purposes. The chickens themselves you can see have a preference for coarser food particles than what most commercial sourced feeds are made of.I get kinda skeptical about making feeds. I am not good at math so I am always afraid that I would get something wrong... so I leave it up to the professionals