Zolotaya antilopa

I think this is the animated film I saw on TV when I was merely seven or eight years old. I recall it being quite quiet in its depiction of a young boy on a quest (to find something, no doubt) who is aided by a magic antelope. It was on 50s TV of course, so it seemed to be black and white to me, and to have a roughly "silhouette" style of simple flat forms. But - as vague as this recall is - I DO remember that I was utterly enchanted by it. It seems to me it was presented over the course of several weekends, and that I couldn't wait for it to continue. I remember the boy riding on the antelope's back as they sped over the countryside, and (I believe) the antelope eventually undergoes a transformation. I wish I had more information. I wonder if it still exists as a film. So many have vanished.