Table 3. Appearance of Infection in Flocks Previously Negative 



* Represents r'-tests 



The incidence of "brealcs" appears to be on the decline and it is hoped that 

 flock owners will exercise all possible precautions in keeping infection out of their 

 flocks. "Breaks" are very costly especially after a flock owner has established 

 a pullorum-free flock with good breeding. 



Too often flock owners forget or ignore the following measures which are 

 effective for establishing and maintaining a pullorum-tree flock. 



