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Originally Posted by Penguin
Breeding simular races is practiced since a long time, for example between donkeys and horses.
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That's not even close to the same thing. Donkeys are horses in every genetic sense and their offspring are always sterile when they actually manage to survive pregnancy. Were one to cross a 10,000 year-old extinct species of equus with a horse, I would expect little result.
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This is quite important. All the enivromental influences/illnesses that elephants have adapted to, are not in the mammoth's DNA. So I think the hybrid could be very vunerable to stuff like this.
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My point, exactly. There's a good chance that the mother's immune system will generate antibodies, Killer-T's, and other protein-specific anitigens that will simply destroy the mammoth embryo, or eject it from the uterus. My knowledge of pregnancy dynamics is limited, however. I was hoping that we might have a natal physician in our midst who could explain how such a thing might work.