I would think that sauron used slaves to farm land and raise animals for slaughter as that many orcs couldn't just hunt. my question is does anyone know where in middle earth his food supply was coming from as I don't recall it being mentioned. If indeed there were supplies coming from else where would not simply cutting those supply line have been effective in defeating saurons armies as after all an army marches on its stomach.
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The lands around the Sea of Nurnen/Lake Nurnen were considered to be the breadbasket of Mordor. Their food was grown or produced there
I like Ian's answer better...lol
"Looks like meat's back on the menu!"
Enough said.
I think that they got most from the Easterlings in the East(volcanic ash)
and maybe, a big maybe....the Entwives are enslaved to grow💚