This new 1-gallon Magrath Fluidfeeder permits one-handed administration of colostrum and life-saving fluids to newborn calves. With a smooth reinforced plastic probe and a yellow thumb valve, fluidfeeder allows the user to stop the flow while inserting the esophageal tube, a feature designed to help prevent accidental insertion into the trachea. Fluid flows into the calf when the semi-flexible bottle is turned upright.