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They are somehow encouraging the swine to mount the leather-covered block.
That's some trick.
(covering is a term used when livestock meet in sexual congress. I've usually heard it used with reference to horse breeding, as in the stallion covers the mare, but I guess pigs can have fancy terms applied to their actions as well.)
You'd think they'd have the back of the block looking more she-pig like. Maybe pigs are not that discriminating.
I also wonder if they have to expose the male pig to the scent of a female pig in estrus?
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