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I often buy Purina because it is what is sold at Ace (they sell Abers as well, but at $22 for 50 pounds, I seldom buy it). I was told that Purina poultry feed is from their Spokane mill and the grains are all grown fairly local to there.
I do like to support Patriot farms because of their sustainable practices, but the food is very fine and dusty. It makes a dusty mess inside the coop so I now will only use it in the outdoor feeders. I also had issues with a batch of chicks I was raising on it. They were growing very slowly and at about 5-6 weeks old, some got the wobbles. I read that wobbles are frequently due to a vitamin defficiency (forgot which one), so I switched the chicks to manna-pro and purina chick start (alternated daily) and the wobbles cleared up within a few days.
The same types of plants and grains will not always produce the same levels of vitamins and proteins, even when grown under the same condition. I don't know if Scott tests each batch - that may be cost prohibitive. A large operation despite my aversion supporting them, will usually have more testing done. My adult birds have never had issues on his feed, and they love it.
Years ago I worked as a researcher in the pharmaceutical field at a contract research company. Some of our biggest clients were pharma companies that make natural products supplements like what you can buy in health-food stores (Germany is one of very few countries that regulates natural products. In this country they are so poorly regulated they often contain none of the products they advertise and sometimes even contain addictive drugs to keep you hooked on them!) We tested plant extracts for them to ensure that they made their products with the same level of active ingredients from batch to batch. Just because you use the same amount of St. John's wort plant extract for each batch of pills you make does not mean that the active levels will be the same. Expression levels of active ingredients vary in response to weather, water, and other stressors. The same woud be true for vitamin levels in grains used to make chicken feed.