CONCLUSIONS. 



Data submitted for the 1921-22 season show that more ser\dce has been given under 

 the law than has heretofore been possible. More poultrymen than ever before have 

 become interested in the elimination work. At the end of this season, but including 

 the work of two previous years, 77 poultry plants in Massachusetts have been found 

 free from bacillary white diarrha?a infection. 



During the season of 1919-20 there were seven flocks of Rhode Island Reds free 

 from infection, three flocks of White Rocks, one flock of Barred Rocks, three flocks of 

 ^^^lite Leghorns, six flocks of White Wyandottes, and four flocks of miscellaneous 

 breeds. In 1920-21, by testing and elimination of reactors, there were added to the 

 list of flocks free from bacillaiy white diarrhoea nine flocks of Rhode Island Reds, three 

 flocks of White Rocks, three flocks of Barred Rocks, six flocks of White Leghorns, 

 seven flocks of White Wyandottes and seven flocks of miscellaneous breeds. Each 

 j'ear there are found either new flocks free from this infection or flocks that have been 

 made free by testing. During the period reported in this bulletin, eight flocks having 

 heavy infection in past years have been freed from infection, the reactors being located 

 by an examination of the blood for the specific agglutinins of Bacterium pullorv7n, and 

 eliminated from the breeding flock. A series of tests, however, has been necessary 

 before the desired result was obtained. In this season twenty-three flocks representing 

 different breeds were added to the list of flocks free from bacillary white diarrhoea. 



A change in the rules and regulations under which service is given will correlate 

 much more closel.v the field and laboratory service, and will aid materially in furthering 

 the purpose of the law in question, which is to eliminate from the breeding flocks of the 

 State the infection of bacillary white diarrhoea. 



