This model come original from http://thefree3dmodels.com/stuff/animal/cow/24-1-0-1837 and author is Makrushin Andrey.
The model was low polygon ( 1623 triangles ) and in obj format. I have refine it to 103,872 triangles and convert in surface. ( sldprt and step )
This model is completely redesigned, this is not only repost from one web side to other !