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My opinion is that you do not want to raise fat content in their feed if you intend to breed them. I kept my CX on 18% grower, boosted to around 22% with dry cat food, but limited to about 15 to 30 minutes of eating time; after that they had to browse for their food.
Why cat food when there is 22% chicken feed? Do you grind the cat food or does it come as crumble food? No cats in our home.
When I'm feeding several different small groups of different ages or breeds at different protein levels, it's cheaper for me to buy Nutreena 18% grower for chicks and Nutreena Layer for hens/pullets, then bump the protein level up for faster growth or breeding fertility if wanted. I can buy 31.5% protein cat food in a 50 lb. bag for about the same as a premium brand bag of chicken feed, top dress it in my chicken feed or toss it as scratch, and bump the protein level up wherever I want it; and with the added benefit of getting animal proteins including taurine in my feed [bean meal falls short in some important proteins]. The cat food stores well if kept dry. It has to be ground or soaked for new chicks, and only worth the effort if I don't have enough chicks to warrant buying a bag of meat and gamebird starter. Somewhere between 4 and 6 weeks they start eating it whole, and will always pick it out of the ration first, then eat the regular krumbles or mash later. Since I always try to take advantage of grass clippings or natural browze, I like to offer them a higher protein, but economical, mix in the feeder to compensate.