Determination of meat and bone meal's amino acid content and their true digestibility coefficients in Legharn ceceltomized roosters

Amino acid (AA) content of six meat and bone meal (MBM) samples was determined by ion-exchange chromatography. True AA digestibility of amino acids were determined of using precise sibbald''s feeding method. Metionin and Lucien، with averages of 0. 35 and 2. 29 percent، had the lowest and highest values among essential AA of MBM samples. Average content of individual AA، sum of essential and non-essential AA and sum of AA values were lower than the corresponding values in NRC (1994). Individual digestibility values of AA، sum of essential and non-essential AA، Sulfur AA and sum of AA were not significant different among MBM samples Except Met and Pro (p<0. 05). Average digestibility values of Cys and Arg were 73. 7 and 89. 4 percent which were respectively the lowest and highest AA digestibility values among MBM samples. It was concluded that AA digestibility values of MBM samples were at high levels but due to their low content MBM samples، their digestible AA content values were at low levels.