COMMON POULTRY DISEASES 



309 



CLASSIFICATIONS OF DISEASES 



Common poultry diseases are of two distinct kinds, 

 those which respond to flock treatment, and those which 

 may be treated individually. By far the greater number of 

 diseases which attack birds fall into the former group. A 

 recognition of the cause of the trouble, and stringent meas- 

 ures to stamp it out are the only sure preventives. 



Fig. 171. — An isolation coop or fresh-air hospital, used to separate sick or ailing 

 birds from the rest of the flock. 



Flock Diseases. — Flock diseases are those which can be 

 treated by administering remedies to all of the birds in a 

 flock. They are of two kinds, but the most common are 

 those caused by improper feeding. In the same class may be 

 grouped those due to damp or poorly ventilated houses. 

 Roup and canker are familiar types of disease due to im- 

 proper environment. In the various diseases caused by 

 germs, infection is often from outside sources. Here there is 

 little danger, if proper precautions are taken to keep up the 

 strength of the home flock. 



