According to Migrant Justice:

The average dairy farm worker works 60 – 80 hours a week.
40% of farm workers are paid less than minimum wage.
40% have no days off.
28% routinely work seven hours or more without a break to eat.
20% have their pay illegal held.
15% live in overcrowded housing and 15% have inadequate heat.

From a 2014 survey of 200 Vermont dairy workers