Biological efficacy of L-lysine preparations containing biomass compared to L-lysine-HCl

In two growth experiments on broilers of 6 to 27 days of age, the biological efficacy of three L-lysine preparations containing biomass was evaluated in comparison to L-lysine.HCl. L-lysine from the different sources was added in graded levels to a basal diet deficient in lysine, but adequate in all other nutrients. From multi-exponential regression analysis of weight gain and feed conversion responses, biological efficacy of the three L-lysine preparations containing biomass was estimated to be 97%, 103%, and 113%, respectively. None of these estimates was significantly different from 100%. Thus, it is concluded that the efficacy of the L-lysine preparations to deliver lysine is equivalent to L-lysine.HCl.