Wow..I have never heard of that either! Thanks.
I had actually read about doing that if one of the puppies got sick, say with Parvo. The antibodies in mom’s body will be in the serum and possibly help the puppy survive. But it makes sense to me that if you can use to it try to save a puppy’s life that is already sick, you could use it in the case where you’ve lost the mom or mom isn’t able to provide milk for some reason. What I read didn’t give the amounts to be injected, but said that a pracited veterinarian should know the procedure.