Calf Care Mangement Calf Cage Till weaning or until calves attain a body weight of about 90 kg, they should preferably be kept in individual pens. These pens may also be moveable. These pens should have following dimensions: 1.5 meter length 1 meter width 1 meter height Floor of pen should be 9 inches higher from floor of barn. These pens must be provided with one bucket for feeding, one bucket for watering and one bucket or bottle with nipple for feeding milking. Floor of calf pens should be made of wooden pieces with little space among them for drainage.