I like the poultry idea, the omega3 and proteins in the hemp seeds would be perfect for free ranging poultry.
EDIT:
also the above comments about goat milk are right on, and it is stupidly simple to make goat cheese from the milk. Check the price on goat cheese next time your in the store...it may push you toward goats more than poultry, but if you have the resources, patience, and time, 9 acres is plenty to do both goats and poultry. I'd do ducks, chickens, and turkeys if I was up in Nebraska like you!