Ribs
The beef carcass has 13 pairs of ribs, but not all of the ribs are included in the rib primal cut. The first 5 ribs are part of the chuck cut in the front of the animal.
Pork Ribs
The ribs are cuts taken from the loin and the side/belly primal cuts. There are several different types of ribs and they vary in meatiness and bone structure depending on the section from which they are cut.