In Finland, municipalities keep a certain number of "substitutes" in their payroll, who are more or less able to cope with most of the tasks of a typical farm. And then the farmers (who are considered a special class of entrepreneurs) can have a maximum of 26 days of holiday per year. These people also jump in when a farmer needs a sick leave. The Finnish term is "maatalouslomittaja".
Edit: I found a description in English: http://www.mela.fi/en/farmers-holiday-and-stand-scheme