The environment ones'flock is subjected to is critical in controlling worms. A program that will work in Indiana may be useless in Alabama and not needed in west Texas. Thus, take stock of temperature conditions, humidity, rainfall, lushness of forage, animal stocking density, etc. before planning a program. Usually, regions with warm, moist weather, lush forages and mild winters have the most potential for internal parasite problems. Lambs are at most risk of adverse affects of parasites, followed by lactating ewes, ewes in late gestation, dry ewes and rams.
Internal parasites can be a serious problem in lambs and lactating ewes.
Thus, these are groups that should be targeted. To control parasite infestation, one needs to prevent infection. This is accomplished by timely anthelmintic treatment of the flock and pasture and animal management procedures. Each of these can be effective if used properly and at the recommended dosage. Levamisole is available in either drench, bolus or injectable form.