10 Department Circular 47, U. S. Department of Agriculture. 



Plowing the land infested with the larvae of stomach worms greatly 

 reduces the danger of infection. This fact allows the same land to be 

 used two or three times for sheep in a season by using forage crops. 

 Fall-sown wheat can be used for the earliest period, the land broken 

 and resown to peas and oats, rape, or soy beans for a later grazing, 

 and in some cases plowed again and sown to wheat to furnish late-fall 

 feed. A succession of such crops is particularly desirable for carrying 

 over from weaning time until winter the ewe lambs that are to be 

 retained in the flock. 



Where sufficient changes of pasture and fresh ground can not be 

 provided, preventive dosing may be partially relied upon. The 

 danger in depending upon treatment lies in the fact that while cures 

 usually can be effected by its proper use, lambs that have been al- 

 lowed to reach the point where medicine is needed have at least been 

 seriously checked in growth, and unless very carefully watched some 

 deaths will occur. 



The treatment can be used as a measure to hold the stomach 

 worms in check, in conjunction with rotation of pastures. Many 

 successful shepherds dose all the ewes before turning them on the 

 spring pastures with the lambs. This greatly lessens the number of 

 eggs dropped. Afterwards all the lambs to be kept are similarly 

 treated at the time of weaning, and individual cases may be treated 

 on the first appearance of symptoms which will be noted if the flock 

 receives the attention it really requires. When pasture rotation and 

 similar preventive measures are impossible, sheep may be given the 

 copper-sulphate treatment, preferably in diminished dosage, every 

 month or 6 weeks during the summer season. 



The stomach worm need not be a serious trouble for a good shep- 

 herd who has his lambs come early, feeds well, drenches the flock as a 

 measure of prevention, and provides a rotation of pastures or pasture 

 crops. 



