Re: New Kitten, Whole Prey and Questions
The kittens are beautiful, congrats on bringing home a new family member! I'm glad you are going to start the new guy off right with raw, I can't wait to hear about his progress and see how he's doing in a few years.
I wouldn't feel bad about changing food right away, just make sure he's eating whatever it is you choose to give him so he stays nice and healthy. BUT if you are worried about too much change too fast and want to be able to tell if any tummy upsets are caused by food change or not then wait a week before changing anything. If during that week he doesn't vomit, stop eating or have runny stools for any length of time feel free to switch him to something good!
I've actually never fed whole prey myself (I'm too attached to little critters), not sure what the usual reaction is for first timers. What I might try is seeing if you can get him to eat non-prey items first, just plain raw chicken meat cut up small. He needs to build up some jaw strength and get used to this strange new food so starting off with the easiest and usually tastiest part (the meat without bones or organs) might be a good idea. he should catch on faster than an adult whose jaw has been weakened by years of little use. While he's eating the NV (I'm not familiar with the different pre-packaged raws, I assume that it's ground though) throw in a few chunks of chicken right off the bat, there is no reason to go slow by keeping him on the NV alone so long as he's eating. After a week of slowly increasing chicken chunk size if you think he's doing really well introduce some tiny pinky mice or day old chicks. They should be easy first bones and the cat won't be confused by hair or feathers. I'd do these for a few days and if he does really well just keep on moving onto new species. Once he's eating a couple of species stop the NV and you are feeding raw. if he was an adult I'd tell you to take it slow but chances are he'll go fast so let him, if he's eating something reliably for a few days move on up. If he is hesitant to start a new prey species give him one he's used to (a small pinky mouse or even a few chunks of chicken) so that he might understand it's meal time and he should try a bite. when moving on to feathered or hairy animals maybe cut off a wing or leg so he has something manageable to experiment with, plus if it's cut open he'll recognize the edible meat and bone inside and might start trying to get to that.
And there is never too young an age, think about it if they were feral. They would be weaned and then started on meat, maybe regurgitated at first (I know dogs do, I assume cats as well but what do I know) but by this age certainly they'd be eating from the carcass.
Do you know if he is a male? There is a bit of a size difference between male and female Maine Coons correct? Of course he's a mix so who knows. The short of it is, feed him as much as he'll eat 3-4 times a day. If you want to get more specific it will be about 2%-3% of his adult body weight daily. So if you want to hazard a guess at an adult weight I'll do the math for you so that you can at least have some idea of how much he'll eat. I wouldn't worry about specifics too much though, use body condition and energy as your clues to whether or not he's getting enough.
I don't know what the whole prey feeders say as far as supplementation. I know, feeding Franken-Prey, fish body oil has to be given and so I'd say you should do that too. Only those that feed whole fish (which is not considered the safest thing) I believe are giving enough Omega fatty acids. That and something about grass fed meats, but I don't know what sort of place my meat comes from so fish oil is a part of the diet. Other than that just make sure he's eating the organs and you should be all set for nutritional stuff.
Hope I helped some, I'm sure we have some members familiar with feeding prey so hopefully they'll be along with some more tips on getting the cat to accept the strange new food.