Effect of inclusion of condensed tannin with differing molecular weight in diet rich in sunflower oil on ruminal pH and kinetics of gas production in vitro

Condensed tannins (CTs) play a very important role in ruminant feeding. However, their chemical structure and molecular weight have effect on their biology property and efficacy to rumen manipulation. This study was aimed to investigate the effect of CTs with differing molecular weigh on in vitro gas production. Inclusion of high molecular weight CTs (HMWCT) at 2 and 4 mg/100 mg DM substrate had significantly decreased in vitro gas production rate constant (c) (P < 0.05) and total gas production (P < 0.001)

Effects of condensed tannins of some tropical plants on ruminal gas production in vitro

The objectives of this study was to investigate the effect of condensed tannins (CTs) in some tropical plants species on in vitro ruminal gas production. Three plant species, include leucaena (Leucaena leucocephala) (LN), cassava (Manihot esculenta, Cranzt) (CV), and Siam neem (Azadirachta indica A. Juss. var. siamensis Valeton) (SN) (CTs contained at 2.9, 1.2 and 5.0 % of DM, respectively) were selected to use in this study.Plant species had effect on in vitro gas kinetic parameters and gas productions (P<0.01). However, only high concentration of CTs in SN (5.0% of DM) showed the inhibitory effect on the insoluble fractions and methane production at 48 h of incubation. The results suggested that various plant species contained different concentration of CTs had different effect on in vitro gas and methane production, however, others factors affected on biological properties of CTs, such as molecular weight and structure should be further investigated