Cattle may need to be deliberately thrown or tipped over for certain types of husbandry practices and medical treatment. When done for medical purposes, this is often called "casting", and when performed without mechanical assistance requires the attachment of of rope around the body and legs of the animal. After the rope is secured by non-slip bowline knots, it is pulled to the rear until the animal is off-balance. Once the cow is forced to lie down in sternal recumbency (on its chest), it can be rolled onto its side and its legs tied to prevent kicking.