No sir, I don't do or believe in that. My theory is, if he can throw his traits/abilities in his pups, then they can carry forward with these gifts (especially through linebreeding), so I don't need his sperm on ice. And if he can't throw his traits, then I really don't need him on ice

So far, Silverback has thrown above-average to absolutely exceptional abilities bred to a small number of bitches, and the pups who have survived their owners are truly superior dogs. Therefore, his key traits can be carried on, if people breed these pups right.

If they want to tap back into him, they can take advantage of him now, while he's here.

Thanks for asking,

Jack