28 MASS. EXPERIMENT STATION BULLETIN 407 



tains fewer than two percent of reactors, the last test having been made within 

 12 months immediately preceding the date of sale of hatching eggs or chicks from 

 such a flock. 



79. What is a U. S. Pullorum-Controlled hatchery? One operating under 

 the supervision of an official State agency and hatching eggs or brooding chicks 

 from only U. S. Pullorum-Controlled, U. S. Pullorum-Passed, or U. S. PuUorum- 

 Cleart flocks. 



80. What is a U. S. Pullorum-Passed flock? A flock in which all birds on the 

 premises hav» been tested for puUorum disease when more than five months of 

 age, under the supervision of an official State agency, and which contains no 

 reactors, the last test having been made within the testing year immediately 

 preceding the date of sale of hatching eggs or chicks from such a flock. 



81. What is a U. S. Pullorum-Passed hatchery? One operating under the 

 supervision of an official State agency and hatching eggs or brooding chicks from 

 U. S. Pullorum-Passed or U. S. Pullorum-Clean flocks only. 



82. What is a Pullorum-Clean flock? A flock in which all chickens to be 

 used as breeders have been tested for pullorum disease when more than five 

 months of age, under the supervision of an official State agency, and which con- 

 tained no reactors in two consecutive tests not less than six months apart, the 

 last test having been made within the testing year immediately preceding the 

 date of sale of h"atching eggs or chicks from such a flock; provided the flock shall 

 have met all the requirements of a U. S. Pullorum-Passed flock in the first one of 

 these two consecutive tests. A flock developed exclusively from purchased 

 hatching eggs produced by a U. S. Pullorum-Clean flock and hatched in a U. 

 S. Pullorum-Clean hatchery may be recognized as a U. S. Pullorum-Clean flock 

 in one annual test conducted under the supervision of an official State agency 

 if no reactors are found. 



83. What is a U. S. Pullorum-Clean hatchery? One operating under the super- 

 vision of an official State agency and hatching eggs or brooding chicks from U. S. 

 Pullorum-Clean flocks onl^'. 



84. Can pullorum-free stock be obtained from flocks or hatcheries classi- 

 fied in any one of the four grades with equal safety? No. Any flock or hatchery 

 which is permitted a tolerance of reactors, no matter how slight, is unsafe if 

 pullorum-free stock is desired. 



85. Will stock from a flock with a low tolerance of reactors live as well as 

 stock from pullorum-passed or pullorum-clean flocks? No. If losses from pul- 

 lorum disease are to be avoided, stock should be selected only from pullorum- 

 free flocks and hatcheries. 



86. Who should be consulted in the purchase of pullorum disease-free stock? 



Whoever is in the position to give reliable and official testing information re- 

 garding the flock or hatchery, aside from the owner. In Massachusetts, testing 

 information can be obtained from the official State agency, the Massachusetts 

 Department of Agriculture, State House, Boston, Mass. 



87. Why should buyers check advertisements? Frequently claims in adver- 

 tisements are incomplete, misleading, or false. The purchase of stock should not 

 be based upon the claims in the advertisement without investigation. 



