I believe fawns are old enough to make it on their own once season opens. The only thing that could affect a decision is the amount of food available. Personally, I'm looking for a doe with buck fawns. I've looked into relocation, when does push away their buck fawns they relocate 5 to 25 miles away. If you're able to take their mother the chance of them staying near or on your property is greater. Buck fawns are also larger and I believe more suitable to make it on their own, other deer are harsh and the lower on the pecking order the less "quality" food available due to larger deer chasing them off.