Allows calves to nurse naturally. Discourage gulping, promote maximum salivation and help prevent cross-sucking which can expose young animals to infection. Saliva has antibodies and digestive enzymes to maximize health and growth. Correct feeding rate helps curd formation, preventing raw milk from entering the intestine (a leading cause of nutritional scours). Inverted tip prevents irritation in the calf's mouth. Hygienic Milk Bar Nipples have no threads or valves to harbor bacteria and do not need to be removed for cleaning. Snaps onto most 2 qt calf bottles.