Think of horse breeders. They have mares and stallions. They take the stallions around and breed them to all the mares they can, to produce top-of-the-line foals. Some breeders even breed the mares right after they produce the foal.
This may sound a little twisted, but twisted is what Saruman became, so: Couldn't it be possible that Saruman did the same thing? Also, we are assuming that he did not have many to begin with; perhaps he had five thousand. 47 years is more than enough to produce 10,000 from 5,000. Or is it?
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I really want to believe they reproduced sexually but I just can't see an Orc, female or otherwise nursing a baby, unless they're more like fish in that they produce a lot in one go but then leave them to fend for themselves.
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I think that they would produce them and then leave them.