I would probably let nature take it's course. Some of them don't survive the rut and the onset of winter or have run ins with predators and get injured as they escape.
Like the case of this mule deer doe that showed up in my back wood lot late season 3 .... maybe 4 years ago. She was torn up severely. Big claw marks to flesh all down her back to her hinds. She had a large portion of the skin torn open from her mid section across her ribs and belly and up into her left hind quarter. The meat was exposed and the skin hung from her. It was a grizzly sight and I thought for sure she was going to die back there in the wood lot. Next spring, early while the snow was still around this doe comes in the back yard and one look at her and I knew right away it was the same doe. The claw marks were healed but clearly visible as the fur was not grown in over the scars. We are talking from her shoulder to her ass on both sides. The big portion of skin where she was torn open was gone, replaced by a large scar area that had peach fuzz looking hair. She walked really stiff on her back legs.... like she was constipated looking.... but she was still able to jump a 4ft fence. I couldn't believe an animal could suffer such severe trauma and live thru a BC interior winter. She has been a regular off and on every year since and though her scars are still visible, the hair eventually grew in evenly by the following year. No vet, no medical interventions by humans or CO's...... just nature taking it's course.