Will Falconer, DVM Moderator
Oh, the colostrum is largely NOT absorbable, but the transfer factors are purified out, and they are "species agnostic" meaning, they are tiny and are the same in all species. In other words, a cow-made or a chicken-made transfer factor can help the immune system in a human, a dog or a cat.
So, I *don't* recommend colostrum for that very reason. But the potent part, the useful part, the part that's most valuable to the immune system, that's what I think is the cat's pj's!