I don't think that the movie's very accurate with regards to the Uruk-hai... in fact, if I'm not mistaken, Saruman wasn't responsible for their coming into being at all, they came from Mordor. Saruman crossed men and orcs. I would assume (since they can be crossed with men) that orcs reproduce after the normal fashion... they are afterall, essentially inbred elves.
Interesting though that we never see or hear about orc females or their children. But we don't hear about dwarf women and children either, and they certainly exist.
-Sophia
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The seasons fall like silver swords, the years rush ever onward; and soon I sail, to leave this world, these lands where I have wander'd. O Elbereth! O Queen who dwells beyond the Western Seas, spare me yet a little time 'ere white ships come for me!
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