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What does their diet consist of besides the scratch grains?
Layer crumbles and scratch was about all I was feeding. I scramble eggs and make cornbread pretty often, mixing pumpkin in my cornbread, I also get watermelon and feed as treats and cold mornings in winter I give oatmeal. Also canned cat food now and then. But as an everyday diet, it has been scratch and crumbles.
I think as long as they are getting a commercial feed as their mainstay, scratch grains as a treat/supplement shouldn't be the culprit. I've never seen a definitive on what causes an impacted crop, or how to avoid it. My personal opinion is that too much of a diet variety can not be good (i.e. lots of different food scraps every day), as well as any food that could cause them to gorge and/or eat too fast.
My bantams get a mainstay of commercial gamebird breeder pellets, and I supplement daily with scratch grains that I mix myself - usually equal parts BOSS, safflower seeds, corn and kitten chow. Extra treats they are getting now are dried meal worms.