DISTRIBL'TION OF TESTS AIND REACTORS 



A total ol 1,169,822 chicken samples from 11 counties was tested, and the per- 

 centage of positive tests was 0.13. No reactors were detected in seven counties. 

 Also, the White Leghorns tested revealed no reactors. Middlesex, Essex, Plymouth, 

 and Worcester led in the number of samples tested. 



The following breeds were tested: Australorp, Bantam, Barred Plymouth Rock, 

 Brahma, Columbian, Cornish, Crosses, Delaware, New Hampshire, Rhode Island 

 Red, White American, White Leghorn, White Plymouth Rock, White Wyandotte. 



The White Plymouth Rock, Rhode Island Red, Barred Plymouth Rock, New 

 Hampshire, and White Leghorn were the predominating breeds tested. The num- 

 ber of tests for Barred Plymouth Rock and White Leghorn breeds increased slightly, 

 whereas the number of tests for the Rhode Island Red, New Hampshire, and White 

 Plymouth Rock breeds decreased slightly. Of the total samples tested, 26.72 per- 

 cent were taken from White Plymouth Rock, 2.5.48 percent from Rhode Island Red, 

 20.25 percent from Barred Plymouth Rock, 13.05 percent from New Hampshire, 

 And the remainder from other breeds tested. Of the 1,064,832 samples collected 

 from females, 25,418 were from hens and 1,039,414 from pullets, with 0.92 and 

 0.11 percent reactors, respectively. Among the 104,990 samples collected from 

 males, 0.07 percent were positive. 



ANNUAL TESTING OF FLOCKS 



Table 2 lists the results from flocks tested (1) for the first time, (2) intermit- 

 tently, (3) for two consecutive years, and (4) for three or more consecutive years. 



In the group tested for the first time, no reactors were detected. Fewer flocks 

 and birds were tested in this group than during the previous season. The average 

 niimber of birds to a flock in this group was 1,236. 



In the intermittent group the percentage of reactors was the highest for the 

 four groups. All the reactors were identified in one flock. The number of birds 

 tested in this group was slightly greater than in the previous season. The average 

 number of birds to a flock was 3,380. 



In the two-year group all the reactors wore identified in one flock. The number 

 of birds tested in this group was considerably less than in the previous year. The 



Table 2. Annual Testing Versus Single and Intermittent Testing 



Classification 



Tested for the first time 



Intermittent testing 



Two consecutive years 



Three or more consecutive years 



25,953 



51.586 



50.760 



1,041.523 



1,169,822 



Posit:ve 

 Tests 





 530 

 149 

 805 



0.00 

 1.03 

 0.29 

 0.08 



0.13 



Negative 

 Flocks 



oH 



25 



Positive 

 Flock? 





15 



