142 Diseases of Poultry 



Stiles says: "An extermination of slugs will insure im- 

 munity against Davainea proglottina, but no precise directions 

 can be given to prevent chickens from becoming infected 

 with other tape worms until the life history of these parasites 

 is better understood. It will be well, however, to keep the 

 chickens housed in the morning until the sun is well up and 

 the ground is dry, for they will thus be less likely to meet 

 with the supposable intermediate hosts of other worms." 



Round Worjns 



Round worms can be found in the intestine and especially 

 the ceca of almost any fowl. They are much more common 

 than the tape worms. Normally the round "worms cause 



Fig. 22. Worms protruding from a section of the intestine of a fowl. (After 



Bradshaw.) 



no serious trouble to fowls. Under certain conditions, how- 

 ever, they may become so numerous as to be a serious menace 

 to the flock. At such times they have a decided effect on 

 the digestion ; the irritation often causes diarrhea. When 



