Ranch Friends Set #5366 released 2013-2014. Set included a Donkey, Bull, Rooster, Calf, 4 Pieces of Fence, Water Trough, and Oat Bag. On the 2014 Retired List, but still shown in the 2014/2015 catalog. These animals are made of a heavier plastic than the typical ABS Stablemate plastic.
This model is very similar to the Petting Zoo #5950, but appears to be a lighter color. This may just be a variation as I have not compared enough sets to verify.