USDA estimates about three percent of the nation’s hog herd is likely to be regulated by welfare laws this year.

Only nine states, including Michigan, currently have bans in place on gestation stalls or spacing requirements for animals. 

The agency says California and Massachusetts also have retail restrictions on animals raised in gestation systems.  While they produce an incremental portion of the pork supply, consumption in the two states makes up about 14 percent of domestic demand.

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