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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.
A: Men and women have 12 pairs of ribs. Contrary to popular belief, men do not have fewer ribs. The rib cage is formed from these 24 ribs. The ribs in the center are slightly larger, while the sternum or the chest bone forms the central part of the rib cage.