Standard calf nursing bottle with peach teat nipple and vented cap. The Peach Teat nipple allows no more fluid to pass through it than a cow’s udder naturally would, allowing the calf to suckle more intensely than conventional technology. Unique internal collapsing flap-valve holds the milk in the teat, making it much more responsive to the calf’s needs. It is designed to function like a real cow’s teat, moving all the time while the calf is suckling, never closing in its relaxed state.