DISTRIBUTION OF TESTS AND REACTORS 



Table 1 indicates that 1,394,192 samples were received from chicken flocks in 

 13 counties. The percentage of positive tests was 0.05. Middlesex, Plymouth, 

 and Worcester Counties led in the number of tests. No reactors were detected 

 in seven counties (Barnstable, Bristol, Dukes, Essex, Hampden, Norfolk, and 

 Suffolk). With the exception of one, the remaining counties had less than 0.07 

 percent reactors. 



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

 Columbian, Cornish (Red and White), Crosses, Delaware, New Hampshire, 

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

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



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

 predominating breeds. Of the total samples 31.99 percent were taken from Rhode 

 Island Red, 34.63 percent from New Hampshire, 21.41 percent from Barred 

 Plymouth Rock, and the remainder from other breeds tested. Of the 1,271,543 

 samples collected from females, 43,244 were from hens and 1,228,299 from pullets, 

 with 0.002 and 0.06 percent reactors, respectively. The 122,649 samples col- 

 lected from males gave 0.005 percent positive te.sts. 



ANNUAL TESTING OF FLOCKS 



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

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



In the first year group there were 44 flocks, representing 95,991 tests, of which 

 0.61 percent were positive. In this group 41 flocks, containing 96.53 percent of 

 the birds, were nonreacting, and three flocks were positive. The average number 

 of birds per flock was 2,232. 



In the group tested intermittently there were 23 flocks, representing 28,278 

 tests, of which 0.15 percent were positive. In this group 22 flocks, containing 

 97.32 percent of the birds, were nonreacting, and one flock was positive. The 

 average number of birds per flock was 1,251. 



Table 2. Annual Testing Versus Single and Intermittent Testing 



