10 



the past testing season. A poultrynian who had a slight percentage of 

 infection in his partially tested flock at the beginning of the 1927-28 sea- 

 son, was given a non-reacting report on the partial flock test at the end 

 of the season by virtue of his status, due to retesting. The untested birds 

 were isolated in buildings some distance from his tested stock. In 1928-29 

 he had part of the untested stock of 1927-28 tested, together with his 

 tested birds and progeny of 1927-28 tested stock. Most of the Infection 

 this season was confined to the birds not tested in 1927-28. For three 

 successive j^ears this man has had a small percentage of infection at the 

 beginning of the season. Until he has all of his birds tested and removes 

 all the infection from his premises by a retest program, it is doubtful if 

 he will be successful in eradicating the disease from his flock. 



Tested Flocks Classified According to Size 



In sections of the United States, where very little progress has been 

 made in eradication of puUorum disease, a common question is, "Can 

 flocks of any size be made free from the disease and kept free from year 

 to jear?" Table IV is included to help answer this question. 



Since less than 100 per cent tested flocks are always questionable as to 

 their true status, no discussion will be given to such flocks. There were 

 264' flock owners who tested every bird on their premises in 1928-29. Of 

 these, 130 (49.24 per cent) owned flocks of 500 birds or more; 51 (19.31 

 per cent) had flocks of over 1,000 birds; and 14 (5.30 per cent) owned 

 flocks of over 2,000 birds. 



In the 100 per cent tested and non-reacting group, 88 or 56.05 per 

 cent of the total (157 flocks) had over 500 birds in each flock; 38 (24.20 



Table IV. Tested Flocks Classified According to Size. 

 A. Classification of All Flocks. 



B. Classification of Non-reactirg Flocks 



100 T^ Tested 

 75-99.99% Tested 

 50-74 % Tested 

 1-49% Tested 



Totals 



Per cent of Total 

 Non-reacting Flocks 



30.70 



9 



45 



19.74 



9 



3.95 



5 

 1 

 

 1 



7 



3.07 



157 

 26 

 10 

 35 



228 



