Gov. C. L. (Butch) Otter on Friday signed a bill threatening anyone who secretly films animal abuse at agricultural facilities with a year in jail and a $5,000 fine. Mr. Otter, a rancher, said the measure promoted by the dairy industry “is about agriculture producers being secure in their property and their livelihood.” The bill came in response to videos released by the vegetarian and animal rights group Mercy for Animals showing workers at Bettencourt Dairy beating, stomping and sexually abusing cows in 2012.