Why do cows have pins?

The "pins" are actually a part of a cow's pelvis. The term "hooks and pins" refer to the parts of a cow's pelvis that can be felt when judging a cow's body condition. The hooks are the part of the pelvis that are above the flank or more towards the ribs, and the pins are the part of the pelvis that are on either side of the tail. The thurl is the part in between the hook bone and the pin bone. See the related link below for a labelled diagram.
The "pins" are actually a part of a cow's pelvis. The term "hooks and pins" refer to the parts of a cow's pelvis that can be felt when judging a cow's body condition. The hooks are the part of the pelvis that are above the flank or more towards the ribs, and the pins are the part of the pelvis that are on either side of the tail. The thurl is the part in between the hook bone and the pin bone. See the related link below for a labelled diagram.