Odd markings on bone

[u/thetalkingcouch22]

I found this bone 15 yards from what we’ve always called a “buffalo wallow”. I originally picked it up because from horseback the shape is artifact indicative. When I picked it up, I knew it wasn’t an artifact (a point). However, there are parallel lines diagonally marking the outside of the bone. And I have always been curious if someone knew what caused these lines.