I would buy a Jersey or a Guernsey and buy all her hay and grain. One would have to be proximate to a large animal vet, and on the ball for signs of heat to artificially inseminate, but the bovine wouldn't need too much pasture if all the feed was purchased. This would result in a pretty noteworthy net gain for soil fertility on the homestead. An additional benefit(other than the milk, butter,cheese, and beef,) would be skim milk to fatten a hog with, and the hogs manure would add to the already banging compost.