A, yes people slow down in winter, but since
B, all farming operations are harder to do against deep snow and thus eat up more energy, and therefore
C, people focus on a blend of in-cabin annual catchup chores, in-barn annual catchup chores, outdoor exhausting work, and sleeping.

Just watering the stock alone can take a whole, back-breaking, calorie-burning day.

Been there (on a small scale),

~Susan