Fence rail break

I try to give the cattle apples away from the fence as they can get rambunctious with pushing and shoving.  And when Buddy pushes... watch out.

The other day, in pursuit of apples, Buddy pushed a cow or calf - I don't remember - and the animal went against the fence.  In the evening when setting something against the fence I found the rail was broken as it then came apart.  I temporarily nailed another rail above the broken rail until I could properly fix the rail the next morning.