170 SHEEP FARMING IN AMERICA 



ger or carelessly neglects to adopt measures to ward 

 it off, should blame only himself when loss comes. 



A SYSTEM OF MANAGEMENT THAT INSURES A 

 HEALTHY FLOCK. 



Two men in America fought stomach worms all 

 through the disastrous years of the 90 's, when little 

 was known to help ; they found light, they conquered 

 the pests in a measure, and kept on keeping sheep 

 and studying flock management. Finally each made 

 a journey to England and studied the conditions 

 there with a view to solving the problem for Amer- 

 ica. There they found hurdling the best answer to 

 the question. Independently of each other they 

 reached the same conclusions as to the practical 

 solution of the question in America. Dr. H. B. Ar- 

 buckle of West Virginia and the writer were the 

 two men. But they wish to give all due credit to 

 the Department of Zoology of the Bureau of Animal 

 Industry at Washington for at last giving accurate 

 details of the life history of the Haemonchus con- 

 tortus (formerly called Strongylus contortus) for 

 without the details that we now have no certain plan 

 could have been formulated. 



The basis of this plan is the fact that lambs are 

 born free from parasitic infection ; they are healthy. 

 It is only necessary to keep them healthy by pre- 

 venting infection. Their mothers carry over in their 

 bodies the germs that will infect them in the form 

 of mature stomach worms, which when ripe pass 

 away to the droppings and thus infect the pasture. 



