Assisting the Delivery Obstetrical chains are preferred to other traction aids because they are more easily disinfected, and handles are available that may be quickly attached anywhere along their length. Two Chinch chains, one 60-inch chain, and two handles are desirable. Equipment should be cleaned and boiled in mineral oil after use to prevent spread of disease and rusting. Cotton sash cord works well but should be discarded after use. A good mechanical calf puller is needed, not for the amount of pressure it will exert, but for the directions of traction that can be achieved. Other methods of applying traction, such as block and tackle or fence stretchers, apply no opposing force to stabilize the cow and allow pulling parallel to her body only. ~ Traction should be applied cautiously until the vagina and vulva are fully dilated. Tearing the cervix or vagina may result in sterility or death of the cow. The whole purpose of the procedure is to deliver a healthy calf and prevent injury to the cow. If forced extraction is required, chains should be placed carefully on the extremities. If fetal membranes interfere, they should be torn away. Place the noose of the chain above the fetlock and a half-hitch around the pastern. This reduces the risk of fracturing a bone or pulling off toenails. When one or both front or rear limbs or the head is retained in the uterus, manipulation of the fetus is required before traction is applied. Fetal parts must be guarded with the hand to avoid tearing the uterus. Some manipulations can be made with one hand; others require opposing force. Opposing force is accomplished by placing a loop of chain on a foot or the lower jaw and pulling on the chain with one hand while repelling the poll, shoulder, elbow, hip, or hock with the other hand. Care must be taken that the teeth or toes do not tear the uterus.
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