Gloucestershire Old Spots pigs mating in western Washington, USA. It is natural for a sow to have two litters a year as long as she is provided with Stock Photo - Alamy
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870+ Mating Pigs Stock Videos and Royalty-Free Footage - iStock
How to Farm Pigs: Breeding | The Pig Site
Prolific Pigs? Mating Reproductive Capacity with Market Price in Early Twentieth Century Pig Breeding - Duke Rhodes iiD
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