190 



there liavc been no sheep since the previous winter at least, and never 

 allowed to pasture, water, or yard after infected animals. 



Sheep should be supplied with water from running streams or troughs, 

 and should not be allowed to contaminate the water in any way. Filthy 

 drinking water is one of the most prolific sources of the parasite. 



There are two kinds of seasons which especially favor the ijroduction 

 of parasitic diseases. The one is a very wet, warm season, during which 

 the i)arasites seem to be able to live on the damp ground. The other 

 is a very dry season, when the pools of water become diminished and 

 stagnant, and whatever parasitic eggs or embryos there are in them are 

 gathered into so small a volume of liquid that sheep drinking of the 

 water become more readily infected. Wet, damp pastures, and pastures 

 with puddles in them are alike favorable to the worm diseases. Sheep 

 should bo excluded from such places as much as possible. 



A constant watch of the condition of the lungs in dead and slaugh- 

 tered sheep will enable the flockmaster to judge of the progress that 

 his care in preventing the disease has made. 



Medicinal treatment. — There is no medicinal treatment that can be 

 profitably followed. Salting, grain-feeding, and healthful surroundings 

 are required not only to keep up the health of the animal for the pro- 

 duction of wool but to fit it for the market, which is the best place for 

 seriously affected sheep. 



