Molecular weight of condensed tannins of some tropical feed-leaves and their effect on in vitro gas and methane production
A. Petlum A , P. Paengkoum A E , J. B. Liang B , K. Vasupen C and S. Paengkoum DA School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, University Avenue, Nakhon Ratchasima, 30000, Thailand.
B Laboratory of Sustainable Animal Production and Biodiversity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.
C Department of Agricultural Technology and Environment, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Suranarai Road, Nakhon Ratchasima, 30000, Thailand.
D Program in Agriculture, Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University, Suranarai Road, Nakhon Ratchasima, 30000, Thailand.
E Corresponding author. Email: pramote@sut.ac.th
Animal Production Science 59(12) 2154-2160 https://doi.org/10.1071/AN17749
Submitted: 10 November 2017 Accepted: 30 April 2019 Published: 11 October 2019
Abstract
The concentration and molecular weights (MW) of condensed tannins (CT) of three locally available tropical plant species leaves which have potential to be used as ruminant feed, and their effects on in vitro gas, including methane, production were investigated. Leaves of three plant species, namely, leucaena (Leucaena leucocephala), cassava (Manihot esculenta, Cranzt), and Siamese neem (Azadirachta indica A.Juss. var. Siamensis Valeton) were used in the present study. CT contents ranged from 1.2% in the leucaena to 5.0% in Siamese neem. The weight-average molecular weights (Mw) of the purified CTs, determined using gel-permeation chromatography, were 3222, 3409 and 3612 Da for leucaena, cassava and Siamese neem respectively. The above values were within the range reported for CTs of various tropical plant species. We know of no published data on MW of CTs from leaves of cassava and Siamese neem and, thus, this research, for the first time, reported the MWs of the above two plant materials. Subsequently, two CT extracts with differing MWs, such as CTs extracted from leaves of Siamese neem and leaves of leucaena, were selected as the representative of high and low MWs of CT respectively, and used for investigation of the effect of the MW of CT on in vitro gas production and fermentation parameters. Supplementation of CTs of a higher MW extracted from leaves of Siamese neem (at 2–6 mg/100 mg DM) significantly inhibited in vitro total gas and methane production, while supplementation of CTs with a lower MW extracted from leaves of leucaena had no effect, except for total gas production at the highest level (6 mg/100 mg DM) of supplementation. Similarly, CT from Siamese neem leaves had a stronger inhibitory effect (P < 0.001) on in vitro volatile fatty acid, acetic acid and butyric acid production. The above results indicated that concentrations and the MW of CT varied among the plant species; in addition, the efficacy of CTs to inhibit ruminal CH4 emission are influenced by their MW.
Additional keywords: biological property, phenols, plant secondary metabolites, ruminant.
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