RESULTS ABOUT LYSINE UTILIZATION IN GROWI NG MONOGASTRIC ANIMALS WITHSPECIAL RESPECT TO DIFFERENT LYSINE SOURCES

Object of investigations was to estimate lysine efficiency from differ ent lysine sources (lysinemonohydrochloride and lysinesulfate resp.) f or rats, piglets and broiler chickens to reach a higher level of calcu lation of lysine supply. Lysine limiting diets were based on wheat, so ybean meal and wheat gluten, supplemented with different levels of lys ine sources under investigation. Balance trials (rat, piglet, chicken) and growth trails with analyses of body composition (chicken) were do ne to estimate N-balance resp. N-deposition. N-utilization model from Gebhardt (1966) and its further developement for efficiency estimation of feed amino acids were used for data calculation. Results allow con clusion, that there are no differences in utilization of lysine from l ysinemonohydrochloride and lysinesulfate. Limitations of efficiency re sulting from differences in time course of absorption between protein bound and free lysine were not observed under ad lib. feeding conditio ns.