Tannin-rich forage as a methane mitigation strategy for cattle and the implications for rumen microbiota
Gisele M. Fagundes A E , Gabriela Benetel B , Mateus M. Carriero B , Ricardo L. M. Sousa B , James P. Muir C , Robert O. Macedo D and Ives C. S. Bueno BA Universidade Federal de Roraima – UFRR, BR 174, km 12, 69300-000 Boa Vista, Roraima, Brazil.
B Universidade de São Paulo – USP, Av. Duque de Caxias Norte, 225, 13635-900 Pirassununga, São Paulo, Brazil.
C Texas A&M AgriLife Research, 1229 North U.S. Highway 281, Stephenville, TX 76401, USA.
D Universidade Federal Rural do Rio de Janeiro – UFRRJ, Br 465, Km 07, 23890-000 Seropédica, Rio de Janeiro, Brazil.
E Corresponding author. Email: gisele.fagundes@ufrr.br
Animal Production Science 61(1) 26-37 https://doi.org/10.1071/AN19448
Submitted: 5 August 2019 Accepted: 5 August 2020 Published: 14 September 2020
Abstract
Context: Methane from ruminant livestock systems contributes to the greenhouse effect on the environment, which justifies the adoption of novel feed strategies that mitigate enteric emissions.
Aims: We investigated the effects of the condensed tannin (CT)-rich legumes Flemingia macrophylla, Leucaena leucocephala, Stylosanthes guianensis, Gliricidia sepium, Cratylia argentea, Cajanus cajan, Desmodium ovalifolium, Macrotyloma axillare, Desmodium paniculatum and Lespedeza procumbens on in vitro methane emissions and rumen microbiota for beef cattle.
Methods: Four rumen-cannulated Nellore cattle grazing a tropical grass pasture were used as inoculum donors.
Key results: Real-time quantitative polymerase chain reaction analysis revealed that the abundance of Ruminococcus flavefaciens, methanogenic archaea and protozoa populations were reduced (P £ 0.05), whereas total ruminal bacteria were enhanced in the presence of CT. Our study also revealed a positive (P £ 0.05) relationship between CT and Fibrobacter succinogenes abundance. Reactive CT from L. leucocephala, D. paniculatum and L. procumbens resulted in decreased (P £ 0.05) isoacid content and methane production.
Conclusions: L. leucocephala, D. paniculatum and L. procumbens have the potential to suppress rumen methanogenesis. However, in vitro fermentation of L. leucocephala resulted in greater (P £ 0.05) degradability percentages than the other two species.
Implications: CT in legume species will have potential as part of an overall nutritional strategy to manipulate rumen microbiota and mitigate enteric methanogenesis in livestock production systems.
Additional keywords: browse, legumes, methanogenesis, phenolic compounds, ruminants, sustainability.
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