336 SHEEP FARMING IN AMERICA 



of infection from the ground may be avoided by 

 frequently removing the manure from the yard and 

 keeping the surface sprinkled with lime and salt. 

 The lambs and ewes will soon learn the way to their 

 proper pastures, and after a few days little diffi- 

 culty will be experienced in separating them each 

 time after the lambs are through sucking. 



2. Another plan which may be followed where 

 the climatic conditions are suitable that is, in re- 

 gions where there is a cold winter season is that of 

 having the lambs born at a time of year when there 

 will be no danger of their becoming infected during 

 the sucking period, and weaning and separating 

 them from the rest of the flock before the advent of 

 warm weather. Under the usual climatic conditions 

 of the State of Ohio, for instance, if the lambs are 

 born in the latter part of October or the first of 

 November they may remain with the ewes on fields 

 which have not been previously occupied by sheep, 

 goats or cattle within a year or, if cultivated fields, 

 since cultivation until the following March without 

 danger of becoming infected, since the eggs in the 

 droppings of the infested ewes will not hatch out 

 during this time of year because of the cold weather. 

 The use of fields not previously occupied by sheep, 

 goats, or cattle within a year, or since cultivation, 

 is necessary, since otherwise the fields might be al- 

 ready infected with young worms which had hatched 

 out and reached the infectious stage before the be- 

 ginning of cold weather, and the lambs would pos- 

 sibly be liable to infection from picking up these 



