Kinetika Produksi Gas dan Kecernaan in Vitro Pakan dengan Penambahan Mineral Organik Hasil Inokulasi dengan Saccharomyces cerevisiae dan Suplementasi Hijauan Bertanin

Abstract

This research was aimed to observe the effect of organic micromineral, tanniniferous forage and its combination supplementation to gas production and in vitro digestibility.This research used king grass (Pennisetum hybrid) as control, leaves of neem (Azaditachta indica) as tanniniferous forage and monensin as antibiotic. A completely randomized design was applied to this research by using 7 treatments with 3 replications. Variables observed were physical quality of fermented feed, in vitro digestibility, number of protozoa, production of ammonia (NH3), concentration of methane (CH4), production of VFA, and gas production. The treatments were: P (P. hybrid), PO (P. hybrid + organic mineral 3%), POA (P. hybrid + organic mineral 3% + A. indica 2%), PM (P. hybrid + inorganic mineral 3%), PMA (P. hybrid + inorganic mineral 3% + A. indica 2%), PA (P. hybrid + A. indica 2%), PMO (P. hybrid + monensin 40 ppm). Results showed that inorganic mineral supplementation (PM) decreased digestibility of dry matter, i.e. from 63.95% to 32.14% (P<0.001). Organic mineral supplementation (PO) and inorganic mineral + A. indica (PMA) increased butyric acid production from 17.93 mM to 28.09 and 25.89 (P<0.01), respectively. Organic mineral supplementation + A. indica (POA) decreased total gas production from 45.37 to 41.55 ml (P<0.01). It can be concluded that organic mineral supplementation only affected butyric acid production and decreased total gas production when added with tanniniferous forage.