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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.
Each pregnancy lasts for three months, three weeks, and three days. Sows will have an average of 2.5 litters every year for three or four years, most of which is spent in the crates. They give birth to between five and eight litters before being slaughtered.