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Asymmetry is not unusual The Welsh sow had 16 to 17 pairs of ribs compared with an average of all British pigs of 14. http://wgpublications.com/index.html?ref=news&sid=224&action=view&show=25 I hope that helps.
Human anatomy[edit] Humans have 24 ribs (12 pairs). The first seven sets of ribs, known as true ribs (costae verae) also known as vertebrosternal ribs, are directly attached to the sternum through the costal cartilage. Rib 1 is unique and harder to distinguish than other ribs. It is a short, flat, C-shaped bone.