The effect of supplementing a poor kaffir corn diet with L-lysine and DL-threonine on the digestibility coefficient, biological value and net utilization of proteins and retention of nitrogen in children

Daniel, V.A.; Leela, R.; Doraiswamy, T.R.; Rao, S.V.nkat; Swaminathan, M.; Parpia, H.A.B.; Rajalakshmi, D.

Indian Journal of Nutrition and Dietetics 3(1): 10-14


The effect of supplementing a kaffir corn diet providing about 1.31 g protein per kg body weight with L-lysine alone and L-lysine and DL-threonine together on the true digestibility coefficient (DC), biological value (BV) and net protein utilization (NPU) has been studied in girls aged 11-12 years. The retention of nitrogen on the kaffir corn diet was very low (8.6% of the intake). The BV and NPU of the proteins of the kaffir corn diet were 66.9 and 49.3. Supplementation of the kaffir corn diet with L-lysine brought about a significant (P<.05) improvement in N-retention (13.3% of the intake), BV (71.4) and NPU (52.0). When the kaffir corn diet was supplemented with a mixture of L-lysine and DL-threonine, highly significant improvements in N retention (P<0.01) (21.8% of the intake), in the BV (78.3) and NPU (59.8) were observed. The net available proteins (g/kg. body weight) from the different diets were as follows:[long dash]Kaffir corn diet 0.64; kaffir corn diet +L-lysine 0.69; kaffir corn diet +L-lysine+DL-threonine 0.81 and skim milk powder 0.93, as compared with FAO reference protein requirements of 0.72.