14 



MASS. EXPERIMENT STATION BULLETIN 420 



Table 3. — Distribution of Pathological Conditions and Disorders in 

 Birds Necropsied Between the Age of Six and Eighteen Months. 



Group and 

 Year Hatched 



Percentage of Birds with Various Diseases and Disorders 



3 



c'o. 

 > o 





M in 

 QQ 



MQ 



ttJQ 



5 <« 



Q-O 



0) to 



Oh CO 



1935* 



Control 



Female 



High Mortality 



Female 



Low Mortality 



Female 



Miscellaneous 



Female 



1936* 



Control 



Female 



High Mortality 



Female 



Low Mortality 



Female 



Miscellaneous 



Female 



1937 



Control 



Male 



Female 



High Mortality 



Male 



Female 



Low Mortality 



Male 



Female 



Miscellaneous 



Male 



Female 



1938 



Control 



Male 



Female . 



High Mortality 



Male 



Female 



Low Mortality 



Male 



Female 



Miscellaneous 



Male 



Female 



♦Figures for males 

 no significance. 



10.0 



9.4 



10.0 



2.6 



4.0 



20.0 

 7.1 



23.1 

 9.1 



16.7 

 9.5 



7.7 

 3.0 



16.7 

 4.8 



28.6 



17.7 

 33.3 

 66.7 

 25.0 



100.0 

 42.9 



33.3 



23.1 

 39.4 



57.1 



16.7 



30.8 

 6.1 



16.7 16.7 6 



12.2 2.0 10.21 49 



15.6 



7.7 



50.0 



4.8 



94.4 

 100.0 

 100.0 



82.6 



35.7 

 45.2 



33.3 

 100.0 



39.4 

 42.9 



75.0 

 33.3 



100.0 

 35.0 



22.2 

 33.8 



are not included, because the numbers involved were so few as to have 



