no nutrients are completelly destroyed. heating milk is the same as chemical burn. it happens in your stomach with digestion. easy to test it. try to raise a one week old kittens only on pasteurised milk. but before that, after the cat gives birth, give her anti parasitendrug. because if you dont and she has parasites, even flees, it passes the larvae through the milk to its kittens and they die when the parasite grows, usually whe they get a month old of age. so deparasite the cat, and after a week take away the kittens and start feedeing them with pasteurised milk. see if they wil develop at all or not. if nutrients are desrroyed in the milk they will die out of malnutrition in less than 2 weeks. i have tested this and they all grow fine on pasteurized milk.
Pirate