I second that. Spent grains are 30% protien. What do you think eggs are made of? Chickens dont need a lot of starches.They need protien, calcium, fat and numerous trace minerals.
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And if you read that page it says that :Here is a good link.... sorry this is kinda off topic.... sorta, but not really.
http://www.fao.org/ag/AGA/AGAP/FRG/AFRIS/Data/468.HTM
That was the best information I could find.
Quote: It also says up to 30% did not decrease production too. I don't feed that HIGH of a diet barley. I include the barley to cut my feed bill and UP the protein. I think if chickens were giving a choice starches would be at the BOTTOM of what they would eat. They like bugs best and grass, not soy beans. My birds are healthy and happy and LOVE spent grains dried in their feed or wet as a treat. My birds get a HIGH quality layer feed made with PORK and don't get scratch or bread to fill them up without any nutrition.
My question to the example you gave is why did his egg quality suffer, did he not add calcium to off set the calcium that was lacking in the spent grains? I do add calcium to make up for that. No egg production loss or egg quality loss at my farm so to each his own! I save money by feeding it and I don't see a down side at my farm.
I also grow mealworms to feed, they are just protein too. There are several threads on here about spent grains and feeding them. Changing minds on spent grains is going to be an uphill battle.