the concentrations of plasma arginine , histidine , lysine , methionine , phenylalanine , valine , alanine , glutamic acid , proline , serine and tyrosine were greater in hens fed ad libitum while plasma threonine , asparagine plus glutamine , ammonia and uric acid were greater in hens force-fed .
C0061472
glutamic acid
C0017797
glutamine