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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.
Both men and women have the same number of ribs, 12 pairs. It is logical that men and women would have the same number of ribs. The rib cage protects the vital organs within the rib cage.