Hormel Foods Corp. said it would investigate a supplier’s hog farms after an animal rights group published a video purporting to show pigs being abused at a facility in Oklahoma.

The video released Tuesday is the third since November 2015 documenting what animal activists say is cruel treatment of animals at farms supplying hogs that Minnesota-based Hormel processes into Spam, bacon, chili and other products. The two-and-a-half minute video published by the Los Angeles-based group Mercy For Animals purports to show workers...