COCHRANE, Wis. (AP) — Roberto Tecpile often puts in 70 hours a week at the Rosenholm dairy farm in Cochrane, Wisconsin — a place where winter days are short and can be bitterly cold. It is a job that farmers say most Americans refuse to do.

Tecpile, a native of Astacinga, in the Mexican state of Veracruz, has spent nearly 20 years in the United States, the past four working for farmer John Rosenow. According to his boss, Tecpile is the "go-to guy" for fixing farm equipment — whether it be a lawn mower or a gauge. Tecpile said the job is going well, and right now it is the most important thing...