Eight days ago, Gebarten Acres, a large dairy farm on East DeKalb Road, was forced to lay off 17 farm workers from Guatemala and Mexico after an investigation by federal officials showed the immigrant farm workers lacked documentation to legally work in the United States. Greg J. Coller, co-owner of the 2,800-cow farm, said Friday that three other immigrant workers were allowed to stay, but they decided to leave with the other 17. Some had worked and lived at the farm for the past seven years, handling milking and other chores.“They gave us a few days warning so we had time to contact family and friends to help us out,” Mr. Coller said. “Many of us have been working 17-hour days to get the cows milked.”He said he believes many of his former farmhands are already working at other farms, creating a situation where the dairy farm owners suffer the most harm.“I guarantee they’re working. To make them leave is crazy, as we’re the only ones who suffer,” Mr. Coller said.Echoing a problem faced by many other north country dairy farmers, Mr. Coller said it’s increasingly difficult to find Americans who are willing to put in the hard work to keep a farm running.