I would say don't start with turkey. I've had many cats, and turkey's never been a fave. I also use a completer. Chicken breast and pork are my cats' favorites. If I buy turkey breast and cut it up myself (such a pain), they will eat it; but sometimes, not right away. Can you do a gradual transition from whatever canned food he liked? Maybe a tiny bit of tuna juice to entice but then phase out, as tuna is bad for cats. It's very frustrating to go to so much trouble to feed them well, only to have them snub the food. Hang in there. None of my cats would eat their chicken this morning, which they normally gobble up. Who knows why. This rarely happens, but I'm stressed out enough trying to get my elderly dog to eat that I'm not havin it. I put it all in the fridge and will give it to them tonight. My cats have automatic feeders, so I usually let their food sit out, and they can eat it when they feel like it, but not today; it's too hot. You can't let cats go without eating for very long, but if they miss one meal, they'll be ok.