Relative lysine potencies of eight analogues in diets of young turkeys.

Three experiments were conducted to determine the biological potencies of eight lysine analogues in diets of young turkeys. Diets containing increasing levels of added L-lysine or a lysine analogue were fed to 9-day-old male poults for periods of 12 or 14 days. Multiple regression analyses of body weight gains on levels of supplemental L-lysine or analogue were computed. Relative potencies of the lysine analogues were calculated using the slope-ratio technique. Relative potencies of 6-N-N-dimethylamino-2-hydroxyhexan-N,N-dimethylamide, 6-N-acetylamino-2-hydroxyhexanamide, 6-N-propionylamino-2-hydroxyhexanamide. 6-N-butyrylamino-2-hydroxyhexanamide, 6-N-methylamino-2-hydroxyhexan-N-methylamide and alpha-keto-epsilon-acetylamino-caproic acid were not significantly different from 0%. Mono-hydroxymethyl-L-lysine-calcium and bis-hydroxymethyl-L-lysine-calcium had relative potencies of 62 +/- 6 and 52 +/- 7%, respectively, on a molar basis.