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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.
Usually humans have 24 ribs, or 12 pairs. Men and women have the  same number of ribs.In rare cases some people have an extra pair,  or have a pair less than 12, so either 2 â¦ 2, 24, or 26.They are  always in even numbers unless there is some kind of congenital  defect. Ribs 1 to 7 are true ribs (their cartilages attach  directly to the sternum).he upper seven pairs of ribs are true ribs, for a total of 14 true  ribs. Below them are five pairs of false ribs. There are seven pairs of true ribs for a total of 14. They â¦ are also  known as upper ribs and are attached to the sternum.