This is a standard method of casting a cow. The rope for this restraint may be arranged on a cow while she is in the stanchion. She may then be led to the place where it is desired that she lie down and tension applied to the end of the rope.
Make a loop around the cow's neck using a bowline knot placed as indicated in the drawing.
Throw the end of the rope over her back to the opposite side.
Reaching under the cow, pick it up an bring it around her body and under the standing part of the rope near the bowline to form a half hitch just behind the shoulder.
By tossing the end over the cow's back again, make another half hitch just in from of the udder. Pulling the rope will force the cow to lie down.