Neraca nitrogen domba di UP3 Jonggol yang mendapat tambahan legum dan konsentrat pada ransum berbasis rumput Brachiaria huminidicola

Abstract

This experiment was aimed to find out the optimum level of legume used as the grass substitution on nitrogen retention of sheep at UP3 Jonggol. This experiment was conducted according to completely randomized block design with five treatments and four replications. The treatments were : R1(90% Brachiaria humidicola+ 10% Concentrate), R2(80% Brachiaria humidicola+10% legume+10% Concentrate), R3(70% Brachiaria humidicola+20% legume + 10% Concentrate), R4(60% Brachiaria humidicola+30% legume + 10% Concentrate), and R5 (70% Brachiaria humidicola+30% legume + 0% Concentrate). Variables measured were crude protein intake, crude protein digestibility, nitrogen retention, NH3, and VFA. Data were analyzed using analysis of variance and treatment effects were further analyzed using Contras Orthogonal test. The experiment showed that treatments increased crude protein consumption (P<0,01). Furthermore, increasing the legume increased (P<0,05) NH3 and VFA but decreased (P<0,05) crude protein digestibility and there was no effect on nitrogen retention. Because of the forage quality was low, it was not able to increase the optimum body weight gain of the sheep. It was concluded that the substituted with 30% legume and concentrate was the optimum level in B. humidicola based ration. It could increase crude protein of diet and could increase crude protein consumption of sheep at UP3 Jonggol.