All cows need to eat fodder daily, but an adult can be let out to graze on grass instead. A healthy cow can be milked once every day, even if it's outside. The quality of the milk will depend on the cows affection with you and it's health. To raise it's affection a cow may be brushed and pet daily. It takes 14 days for a pregnant cow to give birth and another 15 days for a calf to mature into an adult.