My guess is that there were so many fewer female orcs than males, that the powerful orcs had herums (I doubt I spelled that right) and that is how they multiplied so quickly. One male orc times ten female orcs equals lots of baby orcs. Especially if they gave birth to more than one at a time. Saruman's pits in the movie, I believe simply sped up and enhanced the growth process so he could have an instant army.
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"I come from yonder...Have you seen Baggins? Baggins has left, he is coming. He is not far away. I wish to find him. If he passes will you tell me? I will come back with gold." - Khamul the Easterling
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