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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.
The shape of the horse's chest is an important part of its stamina and endurance. Chest conformation also determines lung capacity. Many horses have 18 pairs of ribs, but may range from 19 to 17 with the exceptions being Thoroughbreds and Arabians.