Per the Rometsol Herbicide label: When used as directed, there is no grazing or haying restriction for use rates of 1 2/3 ounce per acre or less. At use rates greater then 1 2/3 ounce per acre and up to 3 1/3 ounces per acre, forage grasses may be cut for hay, fodder or green forage and fed to livestock including lactating animals 3 days after treatment.