Cows are not photosensitive like chickens and sheep are, nor are they plants. They will "use" the amount of daylight hours that is given to them, naturally or artificially.
8 hours
A newborn calf needs to have his milk every two to three hours.
Uh, stomachs have NO COWS!
The duration of Poor Cow is 1.68 hours.
The duration of Cow - film - is 1.55 hours.
The duration of The Cow - film - is 1.67 hours.
The duration of Cow Belles is 1.47 hours.
The duration of Buying the Cow is 1.47 hours.
Cows, like humans, are usually diurnal - awake during daylight and resting during night. However, cattle can be active at night, particularly during the heat of summer.
If the cattle were raised on pasture, in a 24 hour period, they can graze around 18 to 20 hours a day.
They need to eat 2 square yards.
Same as any other cow: around 24 hours.