I feed Layena, it's cheaper and I can get it from a locally owned feed mill, plus the one time I bought Dumor (thanks to poor planning and
TSC having longer hours over a holiday weekend) I learned what people are saying about quantity of poo and bad smell for myself. Not sure I can speak to the energy level etc of them on Dumor, but I know I'll never use it again.
I don't object to chicken feed having animal protein per se, (which dumor does, it says it's only 'ruminant' meat free which has become standard since the whole mad cow disease thing but not any other kind of 'meat free'). Chickens are little velociraptors and seem to be designed to eat ANYTHING. I think they would give buzzards a run for their money if they could get around better! I just think Layena is a more efficient feed on the basis of the quantity and quality of their poo.
Oh, and it very well could be made in a Purina plant based on the
TSC 'recipe' but that doesn't make it a Purina product. Many foods/feed brands, human and animal, are made in the same factory/plant which is a great way to utilize equipment efficiently, it doesn't mean they're the same formula or quality.