FORTY-FIFTH BIENNIAL REPORT 



37 



the Colusa National Wildlife Area. Losses were limited 

 by the adoption of a suggestion made by personnel 

 of the laboratory that continual hunting over the toxic- 

 area be used to keep the waterfowl out. 



After intensive pilot studies, a large field trial in- 

 volving over 10,000 birds was used to determine the 

 effectiveness of toxoid vaccination of pheasants to 

 limit losses due to botulism on a game farm. Birds 

 inoculated with toxoid suffered a mortality of one- 

 fifth of that experienced by uninoculated pheasants. 



Trichomoniasis 



Ten tons of medicated grain was distributed through- 

 out the San Diego area in an effort to combat mourn- 

 ing dove losses attributable to this disease. Although 



a high degree of success was achieved by this effort, 

 complete effectiveness was not realized inasmuch as 

 not all foci of infection can be found and treated. This 

 work evolved into a co-operative effort on the part 

 of the people of San Diego who feed doves and the 

 department personnel responsible for controlling dis- 

 ease in wildlife. The present approach has been the 

 gradual decrease in the amount of feed put out by 

 the dove feeders so as to avoid large concentrations 

 of birds, thereby limiting the spread of the contagion. 



Anaplasmosis 



In co-operation with the School of \^eterinary Med- 

 icine of the University of California at Davis, a study 

 of anaplasmosis was initiated. The work was under- 



Gome parasitologist Meri Rosen studies a disease problem. 



-Fish and Game Photo 



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