THIRTY-SEVENTH UIENNIAL REPORT 



33 



MAP or 

 CALIFORNIA 



t>C'5r+Wl'-T or NATUBAL ftfSOU<<tS 



TJ.^i-i-GLJ OF fISM t &AMC 



STATt or CALirOBNIA 



Fig. 9 



such cases the birds die of starvation rather than any toxic effects of 

 the disease. The lesions may be cheesy or rubbery in texture and can 

 easily be broken into pieces or scraped from the throat entirely. The 

 latter procedure, followed by generous swabbing of the resulting raw 

 surface with a weak tincture of iodine will clear up the condition in 

 captive birds. Infection has usually been noted to be severe chiefy in 

 concentrations of doves being fed in one spot by humans. Apparently 

 the coarse grain causes pieces of the lesions to sluff off from infected 

 doves and these are then in turn picked up by other doves. The disease 

 is readly transmitted to other doves and domestic pigeons (young) 

 experimentally by swabbing the throat of an infected dove with moist 

 cotton and then immediately repeating the procedure in the experimental 

 bird. 



The disease has been referred to as roup, canker, frownse, and 

 other terms. It is usually caused by a protozoan parasite — Trichomonas 



3—25467 



