Cattle don't need to be baby sat constantly, so a 5 day stretch by themselves would be no problem, but they need to have an established herd order and plenty of grass based feed, If you need to pull calves it is from impropper feeding or not enough excercise, a cow needs to walk about 1/2 a mile a day to keep her body in decent shape, this doesn't include the distance she travels grazing, Do not feed pregnant cattle grain it causes problems with the rumen and inter muscle fat layers (due to an alergic reaction) Bovines are grass eaters, Grain feeding is what builds the "bad fats " that cause colesteral.