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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.
Do women have an extra rib? No, both men and women have 24 ribs. Both sexes sometimes have an extra rib, and in rarer cases two extra ribs. Many people think that men have one less rib than women, due to the bible story in Genesis 2:21-22.