I always took the part about "enslaving of animals for food" as meaning today's meat factories, where animals are kept in terrible conditions, not good ol' farming.
But why would Riker equate the livestock of the Anticans with "today's meat factories"? How could he tell that the Anticans weren't doing good ol' farming, or perhaps something even more humane, in order to obtain their live food animals? It seemed more like Riker were condemning the entire practice of keeping animals for food.
Or keeping animals for eating alive, as it were. But "we no longer enslave animals for food purposes" does not sound as if it specifically condemned eating animals alive.
Timo Saloniemi