ccntage of positive tests was 0.04. Middlesex, Plymouth, and Worcester Coun- 

 ties led in the number of samples tested. No reactors were found among tested 

 birds in Barnstable, Dukes, Franklin, Hampshire, and Plymouth Counties. 



The following breeds were tested: Bantam, Barnevelder, Barred Plymouth 

 Rock, Brahma, Columbian, Crosses, Delaware, Eisenbar, New Hampshire, 

 Rhode Island Red, White American, White Cornish, White Plymouth Rock, 

 Wyandottes (Buff, Golden, Silver Laced, White). 



The Rhode Island Red, New Hampshire, and the Barred Plymouth Rock 

 were the predominating breeds. Of the total samples 46.58 percent were taken 

 from Rhode Island Red, 24.61 percent from New Hampshire, 22.09 percent from 

 the Barred Plymouth Rock, and the balance from the other breeds listed. 



Of the 1,101,743 samples collected from females, 50, 355 were from hens and 

 1,051,388 from pullets, with 0.53 and 0.015 percent reactors, respectively. The 

 111,330 samples collected from males gave 0.007 percent positive tests. 



ANNUAL TESTING OF FLOCKS 



Table 2 gives the results from flocks tested for the first time, intermittently 

 for two consecutive years, and for three or more consecutive years. 



Table 2. Annual Testing Versus Single and Intermittent Testing 



In the first-year group there were 43 flocks, representing 58,003 tests of which 

 0.57 percent were positive. In this group 39 flocks, containing 95.51 percent of 

 the birds, were non-reacting and four flocks were positive. The average number 

 of birds per flock was 1 ,300. 



In the group tested intermittently there were 29 flocks, representing 38,281 

 tests. Only three reactors (0.007 percent) were detected. All the flocks were 

 classified as non-reacting at the end of the season. The average number of birds 

 per flock was 1,316. 



In the group tested for two consecutive years there were 31 flocks, represent- 

 ing 61,411 tests. Thirty flocks were non-reacting, representing 91.38 percent of 

 the birds tested in this group. The average number of birds per flock was 1,981 . 



In the group tested for three or more consecutive years there were 355 flocks, 

 representing 1,055,378 tests. The average percentage of positive tests was 0.01. 

 A total of 354 non-reacting flocks was detected which contained 99.96 percent 

 of the birds tested in this group. The average number of birds per flock was 2,884. 



