I've just looked up in the Silmarillion on page 50 about how orcs reproduced. It reads as follows:
But of those unhappy ones who were ensnared by Melkor little is known of a certainty. For who of the living has descended into the pits of Utumno or has explored the darkness of the councils of Melkor? Yet this is held true by the wise of Eressëa, that all those of the Quendi who came into the hands of Melkor, ere Utumno was broken, were put there into prison, and by slow arts pf cruelty were corrupted and enslaved; and thus did Melkor breed the hideous race of the Orcs in envy and mocery of the Elves of whom they were afterwards the bitterest foes. For the Orcs had life and multiplied after the manner of the Children of Ilúvatar; and naught that had life of it's own, nor the semblance of life, could ever Melkor make since his rebellion in the Ainulindalë before the Beginning: so say the wise.
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