As soon as cities developed, i think it was somewhere around 7000 Bc, farming was the main source of food, farming was no less important in 500 bc to 500 ad than it was in the feudal age. I think it was something like 80% or 90% of people were farmers, as appose to today where something like 2% or 3% of the population in fully developed nations are farmers. So your a bit of if your saying that hunting supplied even as much as 1% of the food during the o ad time unless your talking about the Americas which obviously we are not, Even if you include fishing as a form of hunting, its still makes up a very small amount of the overall food available.