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

Acacia mangium, Swietenia mahagoni, and Artocarpus heterophyllus
commonly used in ruminant feeding practices and which contains CT with potential
to reduce CH4 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>0.05). The potential extent of gas production (a+b)
decreased significantly (P<0.05) at 50% combination leaves. The gas production rate
(c) did not affected (P<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).