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Acacia mangium, Swietenia mahagoni,  and  Artocarpus heterophyllus  commonly used in ruminant feeding practices and which contains CT with potential to reduce CH 4  emissions and improve feed protein utilization. This study was aimed to determine the effect of combination of  Acacia mangium, Swietenia mahagoni, and Artocarpus heterophyllus  as a tannin source on in vitro ruminal fermentation kinetics. The combination leaves consists of  Swietenia mahagoni  (40%) , Acacia mangium  (30%) , and Artocarpus heterophyllus  (30%). The levels of combination leaves which used were 0%, 50%, and 100% as forage sources (60%) and concentrate 40%. Feed fermentation was conducted using Menke and Steingass gas production technique for 48 hours. Kinetic of gas production was analyzed using the Fit Curve program. Data obtained were analyzed using one way ANOVA, and continued by DMRT. The results showed that the gas production from soluble fractions (a) was affected by the treatment. Gas production from the potentially degraded fraction (b) did not different between control and treatment (P&gt;0.05). The potential extent of gas production (a+b) decreased significantly (P&lt;0.05) at 50% combination leaves. The gas production rate (c) did not affected (P&lt;0.05) by combination leaves. Inclusion of 50% of combination leaves in the diet could reduce rumen gas production, the soluble fraction (a) and the potentially degraded fraction (b).

In vitro gas production kinetics as influenced by combination of Acacia magium, Swietenia mahagoni and Artocarpus heterophyllus as tannin source