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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.
Back ribs vs. short ribs. There are 13 ribs on each side of a steer, and the rib cage of a steer covers a lot of territory, from the backbone to the breastbone, perhaps 3 linear feet, and from the shoulder to the last rib, another 3 feet or more. So it matters a lot where the ribs come from.