The studies I'm reading aren't going high enough, but so far, more spent grain is better. Even in your link, 40% was the highest tested and had the best results. I'm going to do some more digging.
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Wheat is the bestIf you can get it, what is the best grain to use for fodder? Or the top 3 maybe?
Quote: x2 some are harder to find in some areas.
I have not done that kind of research. I really just go by what I read for the kidney damage. 40% seemed best to feed.... for most animals. Also, layer feed of years gone by had higher protein than they do now so my goal was to reduce my feed bill and up the protein to about 25%. That seemed in the safe range. They did great on it too. I still mix it in my pullet grower, but my new layer feed is 22% and they are doing well and I don't have to kill myself to keep up with spent grains and mixing feed. I do feed it wet when I get more than I can dry.Huh. I know protein is tricky for people with chronic kidney disease because their kidneys can't process the waste products created by the breakdown of protein. This is a problem healthy humans don't have -- healthy humans can consume a massive amount of protein without ill effect or damage, cumulative or otherwise.
I have heard the same "factoid" (forgive the term!) with chickens as I have with humans -- that what would usually be considered excessive protein is dangerous to their health. In humans, this is, according to all scientific research I am aware of, untrue -- unless the person already has some illness such as kidney disease that interferes with the processing of protein or filtering/disposal of the wastes. Hence the quotation marks around "factoid" -- BUT!!! I have no idea if that is true with chickens or not. While with humans it's a commonly-held fallacy, with chickens it may very well be that large amounts of protein are injurious to their health. However, I'm not finding much by way of scientific evidence one way or another.
Does anyone have any links to studies researching protein intake on chickens?