Just a personal anecdote/observation on this -

I trained as a Gamekeeper, not a ZooKeeper but as a Traditional English Gamekeeper - before that I used to Fish and Shoot regularly and those 3 years put the final spit and polish on some of those skills but my god animal husbandry even with all the modern tool's, methods and science just makes me agog we managed to do it at all.

I mean seriously Hunting looks like the easy option when you know how much effort it takes to bread a gamebird, even when you cock up and over heat your egg's on the first night an can order more in from a Egg Farm, or just trying to keep Wild Bore confined to one location, let alone capture them and then get together a breading stock.

The complexities even with as I said all the modern advantages is a nightmare, seriously Farming is our crowing achivement as a species.