I06 POULTRY DISEASES AND THEIR TREATMENT. 



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A 







Fig. 22. Aspergillus fiimiguuis Gicatly enlarged. (After Mohler 



and Buckley). 



These moulds and their spores occur on dead organic material 

 like straw, grain, etc. They are inhaled in breathing or SAval- 

 lowed with the food. This being the case the importance of 

 avoiding musty litter, and mouldy or musty grain of all kinds 

 is apparent. As with most other diseases the resistance of the 

 individual against infection is here an important matter. Some 

 fowls will be able to stand musty litter and grain without any 

 harm, while others will promptly develop aspergillosis. When 

 once present in a flock aspergillosis is probably transmitted from 

 generation to generation through the eggs. 



Treatment. The disease is prevented by having clean, dry, 

 well ventilated houses and avoiding the use of mouldy litter or 

 grain. Vigorous birds under sanitary conditions are fairly re- 



