You underestimate the power of greed. I use purina start and grow medicated for chicks. At close to $20 a large bag not all that cheap. My chicks had a vitamin deficiency. I started adding vitamins to the water. Problem solved. Everything now days is make it cheaper sell for high. I understand they have to make money. Which feed is best who knows. Even the organic feed who really knows how good it is. Our friends live next to organic apple orchard and they spray the chemicals at night. That's why I say who really knows. My friends had their feed analyst done at CWU.To answer your first question in the USA i am guessing that the cheaper feed for chickens may meet minimum requirements.
It is like anything else the more you pay the more you get. I would not expect the highest quality feed for the cheapest price I can buy.
Also a local mill here supplies a university with there chicken feed. This is a major agricultural university. So to me if it’s good enough for them it is good enough for me.
Luckily yes some may try to cut corners but the reputable companies have far to much to lose if they tried to play games.
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