Alan, almost same thing happened in my neighborhood a couple months ago. Neighbor went to move cattle from a leased pasture to the home place. He had a herf cow down, and she could not get up. He figured she was open, because a cow he'd bought with that one, both supposed to be bred, had calved months before, and that a big steer he had in that bunch had tried to mount her, knocked her down, and hurt her. So he left her there, but took food/water to her every day, and tried to get her up with a tractor. Several days went by . . . the cow still hadn't gotten up. He went out one morning, and she had a calf beside her. He brought the calf home to bottle-feed; kept lifting the cow, and in a another few days, she was up, but wobbly. He brought her home, penned her with the calf but kept supplementing it, cow got stronger every day, and now she seems to be almost perfectly fine. Congrats on saving the calf.