[Results of lysine utilization in growing monogastric animals with special reference to various lysine sources]

Object of investigations was to estimate lysine efficiency from different lysine sources (lysinemonohydrochloride and lysinesulfate resp.) for rats, piglets and broiler chickens to reach a higher level of calculation of lysine supply. Lysine limiting diets were based on wheat, soybean meal and wheat gluten, supplemented with different levels of lysine sources under investigation. Balance trials (rat, piglet, chicken) and growth trails with analyses of body composition (chicken) were done to estimate N-balance resp. N-deposition. N-utilization model from Gebhardt (1966) and its further development for efficiency estimation of feed amino acids were used for data calculation. Results allow conclusion, that there are no differences in utilization of lysine from lysinemonohydrochloride and lysinesulfate. Limitations of efficiency resulting from differences in time course of absorption between protein bound and free lysine were not observed under ad lib. feeding conditions.