I don't know of any stock loading that occurred on the Silverton Branch after the late 1940's or early 1950's. Maybe Fritz can shed some more light on that. The D&RGW did haul horses in and out of Ah! Wilderness Guest Ranch on occasion in later years, but I wouldn't call that livestock hauling in the sense that is being asked about here.
The Ouray Branch might have seen some stock loading in 1952, but the line was standard-gauged to Ridgway (and please spell Ridgway correctly--no "e") in 1953, so any stock loading thereafter would have been in standard gauge cars. .