Dairy in the Cold

Via NAL, here's a description of running a dairy farm in cold weather (brings back memories).  I was surprised a bit--the farm milks 700 cows, and has 20 employees, for a ratio of 1 per 35 cows.  That's roughly the ratio I remember from my youth (my uncle had more and did most of the work himself, until his heart attack). I would have expected a bit more improvement in productivity.