My birds free range 24/7 and so do not each very much chicken feed at all. In fact, I am trying to transition them to completely homemade feed and would like recommendations for a brand of trace minerals to offer free choice. I think they need it not only to round out their diet, but also because of the studies I've been reading lately that it increases egg production when using organic vs rock-based trace mineral mixes. Anything you prefer? Sold locally is always preferred to save on shipping: I live near Austin and shop at TSC most often, though we have a Callahan's, Buck Moore, and indie feed stores scattered around. Thanks!