Improvement Crude Fiber Digestibility, N Retention and Energy Metabolism of Broiler through Fermentation LLM and Methionine-Lysine Supplementation

Leucaena is a tropical legume plants that can be used as animal feed ingredients because it has good nutritional value but a deficiency of the amino acid lysine methionine, for that it must be imported from outside because poultry cannot produce it. This study was conducted to determine the crude fiber digestibility, Nitrogen retention and energy metabolism of broiler that were given Leucaena leaf meal (LLM) ration with some treatments. Research used 30 of broiler chicken 6-8 weeks of age. The experiment was designed by a completely randomized design, which consist of 3 treatments and 8 replications. The treatment were: R0= based ration + 7.5% LLM unfermented, R1= based ration + 7.5% LLM fermented by Bacillus laterosporus and R2= based ration + 7.5% LLM fermented by Bacillus laterosporus with suplementation 0.40% methyonine 1.25% lysine. Data were analyzed by analysis of variance and continued by Duncan New Multiple Range Test. Parameters observed were crude fiber digestibility, Nitrogen retention and energy metabolism. The results showed that treatment highly significant (P < 0.01) on crude fiber digestibility, Nitrogen retention and energy metabolism of broiler chicken. Based on this study it can be concluded that LLM fermented by Bacillus laterosporus with suplementation 0.40% methyonine 1.25% lysine in ration can be used as one of alternative feed ingredients in the ration of broiler chickens seen from the increasing value crude fiber digestibility (57.66%), Nitrogen retention (68.35%) and while viewed from energy metabolism (301.49 kcal/kg) of broiler chickens.