Effects of Rubber Seed Kernel and Palm Kernel Cake Levels in Concentrate on Rumen Ecology and Nitrogen Balance in Goats Fed <I>Briachiaria humidicola </I>Schweick Hay-based Diet
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Abstract
This experiment aimed to study the effects of levels of rubber seed kernel (RSK; 0, 20 and 30%) and palm kernel cake (PKC; 20 and 30%) in concentrate on dry matter intake, digestibility, rumen fermentation and nitrogen balance. Six goats with average liveweight 22 ±2 kg were randomly assigned according to a 3x2 factorial arrangement in a 6x6 Latin square design to receive six diets. Signal hay was given on an ad libitum basis as the roughage. It was found that, there were interactions between RSK levels and PKC levels with respect to total DMI and goats receiving 30% RSK had lower values (P<0.05) than those receiving 0 and 20% RSK, respectively. Digestion coefficients of nutrients (DM, OM and CP), pH and NH3–N were similar (P>0.05) for all diets and all treatments were within the normal range, whilst, volatile fatty acids, rumen microorganism populations and nitrogen balance were similar among treatments (P>0.05). Based on this study, RSK levels up to 20% incorporated with PKC at 20-30% in concentrate diet could be efficiently use for goats fed on signal hay.
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