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I think the Uruk-hai (which generally means 'Orc-folk') are Orcs, not the result of breeding Men with Orcs. Anyway, Tolkien does mention orc women -- in a letter which wasn't published in the book The Letters of JRR Tolkien however, but came to light somehow, possibly due to an auction.
I think Saruman mixed men and orcs to create the Half-orcs, not his Uruk-hai (who boast that they eat man-flesh).
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