1. The role of exteroceptive sense organs in avian feeding behaviour;Berkhoudt,1985
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3. Changes in feather condition in relation to feather pecking and aggressive behavior in laying hens;Bilcik;Br. Poult. Sci.,1999
4. Alimentary canal: Anatomy, regulation of feeding, and motility;Duke,1986
5. Diet selection for protein by poultry;Forbes;World’s Poult. Sci. J.,1994