I have a kitty that seems to be intollerant of chicken. She was on Wellness, but had the trots (and perferred to poop next to the litter box. Oh what fun.
Her vet suggested I switch her to Duck and Green Pea (can't remember the brand, not currently at home). No more trots, but still won't poop in the litter box. She's still getting little packets of pro-biotics in her kibble which she likes.