To pasteurize, the milk is heated to 165. If you do that to colostrum, you have pudding. To heat treat colostrum you heat it to 140 and it must be held at that temperature for an hour. If you get it much above 140 you destroy the vital antibodies. If it drops below that, your efforts are wasted because the viruses you are trying to get rid of won't be killed. I have heat treated enough colostrum to make me decide to try something else.
I know all the theories about why colostrum from one species shouldn't work on another. However, cow colostrum seems to work just fine on dairy goat kids in spite of that. Which goes to show you that what ought to happen is often not what really happens when you actually try it. That goes for a lot of things in life. I am not talking about using cow colostrum on one or two kids, either. I had a commercial dairy and I was milking a 100 does so I raised a lot of kids. My kids got cow colostrum and either pasteurized goat milk or raw cow milk. The other dairies in my area, and there were quite a few of them at the time, fed cow colostrum to their kids, too with great success. So did the local hobby breeders with purebred herds on a CAE prevention program I have no idea how well cow colostrum would work on sheep. I have had very limited experience with sheep. I just threw out the suggestion in case someone might find it useful.