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The armies of Mordor are fed by extensive fields around the Sea of Nurn and are tended to by human slaves, as explained in RotK. The vast majority of these slaves are probably from Rhun and Harad, send as tribute to Mordor. It is possible that the Entwives were captured by Sauron to be used as caretakers for his fields, but that is doubtful. I reckon the number of guards needed to make sure the Entwives would not escape would've made human slaves far more costeffective. After all, though the Entwives were not as wild as the male Ents I think they would still pose a formidable challenge to a band of Orcs. It is more likely that they were all killed in the Second Age when Sauron destroyed the lands of the Entwives, turning them into the Brown Lands.
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'I am the Elder king: Melkor, first and mightiest of all the Valar, who was before the world, and made it. The shadow of my purpose lies upon Arda, and all that is in it bends slowly and surely to my will.'
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