Yeah, and if you bring them in and bottle feed them, they'll likely have to live in captivity their whole life. And most zoos have enough deer, and they're so big and boundy they'd be almost impossible to keep, even on a farm.
Fun story: We were at WDW and were turning off Osceola onto the off ramp there where it goes around behind Pop Century. There was a chain link-type fence there at the time bordering the back of Pop that I'm sure was at least 5ft tall. Maybe 6, hard to judge. I saw a male deer, in the middle of the day, cross the parkway, hit the grass and then leap that fence into the weeds behind Pop. He was huge and boy could he leap! Cleared it with room to spare.