In-vitro screening of Kalahari browse species for rumen methane mitigation

Show simple item record Theart, Jacobus Johannes Francois Hassen, Abubeker Van Niekerk, Willem A. Gemeda, B.S. (Belete Shenkute) 2015-12-03T06:20:41Z 2015-12-03T06:20:41Z 2015-11
dc.description.abstract The nutritional value of browse foliage from the Thorny Kalahari Dune Bush veld of South Africa is not characterized. Most of this browse species is rich in tannin, but still palatable, and is consumed by ruminants during the dry season, as well as having a role to play in mitigating enteric methane emission from ruminants. In this study, the rumen methane mitigation potential of 19 browse species foliage collected from the Thorny Kalahari Dune Bush veld, was analyzed in terms of chemical composition, in vitro fermentation, digestibility and methane production. In vitro gas and methane production and organic matter digestibility (IVOMD) were determined by using rumen fluid collected, strained and anaerobically prepared. A semi-automated system was used to measure gas production (GP) from each browse species by incubating 400 mg samples in a shaking incubator at 39 °C with or without inclusion of 400 mg of polyethylene glycol (PEG). Data for all the parameters collected were statistically analyzed using the SAS (9.0) general linear model (GLM) procedure, and differences between foliage species were determined using Duncan’s multiple-range test. Acacia luederitzii and Monechma incanum showed the best potential for decreasing methane production by up to 90 % after 48 h of incubation. The secondary components (mainly tannins) of the browse species appeared to have a significant effect on volatile fatty acids (VFA), methane and gas production as judged by the comparison of samples incubated with or without PEG inclusion. The substantial amount of crude protein (CP) content coupled with their anti-methanogenic effect during fermentation would make these browses a potential mitigation option for small scale farmers and pastoralists in sub-Sahara Africa. However, it is also very important that systematic and strategic supplementation in a mixed diet should be looked at as the way forward in terms of best utilization. en_ZA
dc.description.librarian am2015 en_ZA
dc.description.sponsorship The European Community’s Framework Programme (FP7/2007-2013) under the grant agreement No. 266018 ANIMALCHANGE and the South African Department of Science and Technology. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Theart, JJF, Hassen, A, Van Niekerk, WA & Gemeda, BS 2015, 'In-vitro screening of Kalahari browse species for rumen methane mitigation', Scientia Agricola, vol. 72, pp. 478-483. en_ZA
dc.identifier.issn 0103-9016 (print)
dc.identifier.issn 1678-992X (online)
dc.identifier.other 10.1590/0103-9016-2014-0321
dc.language.iso en en_ZA
dc.publisher Escola Superior de Agricultura en_ZA
dc.rights Escola Superior de Agricultura. This work is licensed under a Creative Common attribution-type BY-NC. en_ZA
dc.subject In vitro fermentation en_ZA
dc.subject Browse foliage en_ZA
dc.subject Digestibility en_ZA
dc.subject Tannin en_ZA
dc.subject In vitro gas and methane production and organic matter digestibility (IVOMD) en_ZA
dc.subject Gas production (GP) en_ZA
dc.subject Polyethylene glycol (PEG) en_ZA
dc.subject General linear model (GLM) en_ZA
dc.subject Volatile fatty acids (VFA) en_ZA
dc.subject Crude protein (CP) en_ZA
dc.title In-vitro screening of Kalahari browse species for rumen methane mitigation en_ZA
dc.type Article en_ZA

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