Feed Evaluation Based on in Vitro Gas Production of Tropical Forages with Addition of Different Polyethylene Glycol (Peg) Level

This study aimed to determine the chemical composition and gas production based on fermentation in rumen of nine types forage tropical feed commonly used Indonesia. The forages this were: mahogany leaves (Swietenia mahagoni L. Jacq.), tayuman (Bauhinia purpurea), bamboo (Bambusa arundinaceae), canary (Canarium indicum L.), tea (Camellia sinensis), ketapang (Terminalia catapa lamtoro (Leucaena leucocephala), tehtehan (Duranta repens), turi (Sesbania grandiflora). Measurements vitro were carried out at 10 observation points (2, 4, 6, 8, 12, 16, 24, 36, 48, 72 hour). Tannin activity was measured for each sample using measurements divided into three groups with modified levels polyethylene glycol (PEG), ie samples without PEG (P1); + amount 200 mgDM (P2); tannins contained literature studies (P3). Data analyzed a variance by following factorial completely randomized design (CRD) pattern. Statistical analyzes performed all data general linear procedure PROC GLM from SAS. obtained 5% significance level. results calculations showed that crude protein (CP) ranges 5.75 - 22.37% where highest CP owned (S. content fiber (CF) ranged 5.30 20.93%. most optimal measurement given 200mg/kg significant difference (P<0.05). higher tannin forage, lower produced. Measurement condensed varied 0.20% 8.60%. addition mg/100mgDM optimizes rate production, especially grass plants (gramineae).