We used to feed Dumor, both scratch grain and layer crumbles, until last year, when we started getting bags that had a lot of hulls and bug poop. My chickens ate the nasty stuff, but they quit laying. We got some feed from Southern states, and it was even worse. Then we found a local small business who sells feed, I've gone blank on the name, "something Pride". I told him about the laying trouble, he suggested a bag of hog feed to start them laying again. It worked, they were laying agin in just a few days. Then we went back to crumbles and scratch. No problems since, and every bag of feed we've gotten from this fellow has been good feed.
The laying dropped off a bit lately, probably from the heat, so today I bought hog feed again to see if that helps.
I hadn't thought about it, but I think the poop doesn't stink as bad, either. I haven't had to clean out the coop so often.