Table III. 



Comparison Between Flocks Tested for the First Time and 

 Those That Have Been Tested Previously 



The Percentages of Birds in the Leading Breeds 



The following table shows the relative percentages of tlie birds in the lead- 

 ing breeds tested over a period of seven years. The Rhode Island Red breed 

 is steadily increasing, while the White Leghorn breed is decreasing. The other 

 breeds remain about the same. 



Table IV. Number of Birds Tested Each Year, with the Percentages 

 Belonging to Each Breed 



Plans and Control Measures 



The experience of tiie past few years has shown tiiat it is necessary to revise 

 the testing plans for the control and elimination of bacillary white diarrhoea. 

 Within the past few years the poultrymen have used more pullets than adult 

 hens for breeders. Pullet testing is influenced by the time the bird commences 

 to lay, for there is a correlation between ovarian function and the time the 

 reacting substances for the test appear in the blood. The plan of retesting 

 within the same year has been influenced by })lacing the testing season ahead 

 of the breeding season. Working under such conditions it lias been found 

 more difficult to eliminate the infection from pullets than from adult hens. 

 Due to this fact, the department has changed the requirements for a clean 

 flock. Three consecutive negative tests will be required so that no infected 

 birds will remain in the flock undetected. Two plans are presented, either of 

 which may be followed depending upon which is better suited to the flock in 

 question. 



Requirements to be uuide of those requesting service in bacillary white diar- 

 rhoea control: — 



(1) Agree to observe the Control Measures listed l)elow: 



(2) Promise to pay for such service in not more than thirty days from 

 receipt of bill. 



Poultrymen are requested to carry out one of the following testing plans: 



