I think you're mixing up the categories now. The animal originally in question for the factor was the slaughter animal, and the N factor applied only to those.

Otherwise, the discussion falls apart because a human is an animal is an animal. But no one is slaughtering humans with such an enthusiasm as cows or chickens. Equating all animals is a fringe belief not supported by the population at large, and one I don't feel like spending time to discuss, especially as it's not required for this discussion to have been valid.