Mine eat whatever feed I give them. The few times I tried pellets, they were slow to accept it, but they do. Ive also never seen a reason to transition feeds. If I try something new, I give it to them when I run out of the bag im feeding from. That being said, there is one "ingredient" that I have had chickens refuse to eat and that was whole soybeans. I do believe they would starve before they ate one. Im sure that's not the case here though. But for the most part you can kinda of think of chickens as spoiled and usually they just dont like change. But they will normally come around. Of course this is only my opinion. One example I have is several weeks ago I tried Nutrena Layer pellets. I sprinkled some on the ground and they were fighting over it. But once I filled the feeders with it, they looked at me like I was crazy and would not eat it for a couple days