In Wisconsin you should be able to find a fine Normande dairy cow. They give dellicious milk and are very easy to handle as a family cow. I imagine though that as cattle are social animals your cow will need a companion or two, steers perhaps. Jersey is also a good choice, but not as easy to handle. Stay away from Holstein--nice cows if you want gallons and gallons of watery milk.
Thanks! I'll look into that breed. :)
"I imagine though that as cattle are social animals your cow will need a companion or two, steers perhaps."
Goats make good companion animals for both cows and horses, from what I've heard.
Get a female, then you could have cow and goat milk.