Could be a niacin or thiamine shortfall. If you have some brewers yeast add it to the feed. A good multi vitamin added routinely to the water is also recommended 
Vegemite, marmite and promite are also good sources of thiamine B6.
http://www.jefferspet.com/products/avian-super-pack-4oz
	
		
			
		
		
	
				
			Vegemite, marmite and promite are also good sources of thiamine B6.
http://www.jefferspet.com/products/avian-super-pack-4oz
			
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