THE DISEASES OP SHEEP. 305 



is because in northern situations there is prac- 

 tically no danger of infection anywhere, indoors 

 or out, in cold weather. Ewes and lambs 

 should all be well fed to encourage a vigorous 

 growth. I 



When warm weather begins to come in April 

 the ewes should be confined rigidly to the bam 

 and small yard. In that yard there should not 

 be permitted to grow even a single weed or 

 spear of grass. This rule must be absolute. 

 The yard must be small and kept always per- 

 fectly clean. If it is not the lambs may nibble 

 at some plant and on its lower length, or roots, 

 imbibe the germs that we are seeking to avoid. 



Nor shoiild there be any feed thrown into the 

 yard. Furthermore the hay racks should be 

 kept clean and the water clean at all times. 



As fast as ewes cease giving a good milk flow 

 they should be removed to another pen and 

 thus their contact removed, with a per cent of 

 danger. 



When grass comes the lambs should be taken 

 to a field where no sheep ran the previous year, 

 where no sheep manure had been spread the 

 previous year, and where no stream or pool 

 could bring germs from some other flock. Once 

 established there no other sheep should for an 

 instant be permitted to mingle with them. 



The ewes, if there is room on the farm, may 

 be kept over for another crop of lambs, since it 

 will take two crops to produce enough ewe 

 lambs to make up their number. After that all 

 that are not of this youthful blood and free 

 from infection should be sold and the young- 

 sters given possession. 



