The Braden start bottle & nipple features a unique vertical-opening nipple design that helps foster early grain feeding, which aids in rumen development, resulting in size increase, more nutrition absorption ability, & earlier microbial action in the rumen. Tests show that this results in more milk & meat production in the long run. Calves show a strong Nursing instinct the first three days after birth, & the design of the Braden start bottle makes it easy for calves to get the hang of eating dry feed through a bottle. Clean, dry feed is efficiently dispensed with no Spilled buckets or open feed troughs, where contamination can put your valuable calves at risk for disease, to worry about. The convenient top-loading Braden start bottle itself is made of clear. Exclusive design of the rubber snap-on nipple lets the calf get virtually all of the feed with very little spillage, & one nipple will generally last for 2-3 calves.