A field study comparing a pregrazing treatment with the morantel sustained release bolus with a strategic deworming program in first year grazing cattle.

A field trial was designed to compare the efficacy of a pregrazing treatment with a morantel sustained release bolus and two strategic treatments of levamisole in the prevention and control of gastrointestinal parasitism in first year grazing cattle. The infection of calves, pasture contamination and the subsequent effects on performance were recorded.