Garvo is an excellent make of several kinds of poultry food. I've tried it in the past, and Alfamix is a lovely mix of grains which the chickens enjoy. But it's very expensive compared with good-quality ordinary pellets, and transport adds to this. I found a suppler 5 miles from us so I could collect for free, but he gave up selling it eventually because it came in rather brittle plastic bags which were inclined to split too easily, thus making them unsaleable, at least at the full price ( though I was happy with the knocked-down split ones.)