One thing I'd like to point out, and I'm not sure it really makes any difference to anybody's home recipe, is that the nutritional analysis of feed ingredients is broken down by weight, not volume. So the "standard" method of calculating your recipe's value is to weigh all the ingredients and figure it out that way. It seems to me that the way Organics North is doing it is probably the same mathematically, but I cannot really comment on that for sure because I've just consumed a bottle of wine while working on my new coop.
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There are a few reasons, but here are mine...
1. Unless it's organic soy, it's probably GMO (and even still it could easily be contaminated by GMO).
2. Soy farming is one of the biggest destroyers of the
Amazon Rainforest.
3. Soy is really not a natural chicken feed at all. It has to be heated (baked, steamed, I'm not sure how "they" do it) to a certain point before the protein is even available to the chickens.
4. Some folks are concerned about estrogen in soy, while some say it's a totally different type of estrogen and not a factor. I don't know, it doesn't matter to me due to the previous three issues.