You can crack them if you want. Turkey and chicken necks are not solid pieces of bones. And they are not hollow. But a mixture of both. They have what looks like thousands of tiny pockets of whatever. I usually say it looks like some solid spongy material. You will know what I mean when you cleave one in half.
I would remove the skin. There will be enough fat on the actual neck.
If your cat doesn't take to it at first then you could rub.
Don't cut them too short. Cats are lazy creatures and if it can be swallowed whole it will. If you are feeding as a main diet probably no more than 6oz a day.
Turkey necks are thick. Probably 3-4 times thicker than chicken necks. Its tough to say if you should cut lengthwise. If its lengthwise some of the bone will not be covered with soft meat as it goes down the esophagus. If its more for a dental treat then I would leave it whole and let the cat work on it.
I would put the necks in individual plastic baggies. If you are planning not to go through all of them within a few months then you might need to portion some of them in plastic baggies and the rest in airtight containers or seal a meal them. Then when you are ready for the others defrost them in the fridge just enough to pull them apart and place in baggies.
If you were planning for these to be the main diet I suggest you add a little more muscle meat. Turkey necks have a Ca
h ratio of 2.39:1 a general rule is 1.1:1 and mice are about 1.38:1 . Some say max is 2:1. If it is just a dental treat then don't worry about this.
