john rosenow, was on his ninth trip in recent years, visiting the families of his ten mexican workers the parents of marco rosales.er >> is any message you'd like us to take to marco? >> tell him that we are well and tell him to behave. >> reporter: does he mostly behave? >> marco behaves a lot, because he works all the time. marco at times works 12 hours a day and right now it's 10 below. >> reporter: on a frigid early january morning, i got to seema o's routine, which begins at the crack of dawn in the milking parlor. >> we run this 24 hours a day. >> reporter: how many gallons of milk? >> today we'll ship probably 5,000 gallons. >> reporter: families like rosenow's, he's fifth generation on this farm, helped give america's dairyland. but the unrelenting routine of milking, biring, feeding and eaning is one rosenow says americans long ago stopped wanting to do. for years,osenow says he's tried to recruit for jobs that pay between 32 and, 42,000 a yearus on-farm housing if needed. >> i've gone to farm supply stores locally, asking people that work there and i've never got a response,