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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.
Men and women both have 24 ribs - 12 on each side. The first seven pairs of ribs are connected to the sternum (breast bone). Rarely, some people have one more or less pairs of ribs due to various genetic mutations. For more information, visit the Related Links.