ArticleTropical animal health and production2026
In vitro digestibility and ruminal methane production of the predominant Namibian rangeland encroacher bush species collected in two different seasons.
Article in Tropical animal health and production, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study evaluated the in situ neutral detergent fibre (NDF) digestibility, in vitro organic matter digestibility (OMD) and methane production of the encroacher species Senegalia mellifera, Dichrostachys cinerea, Terminalia sericea and Rhigozum trichotomum. Leaves and twigs (≤ 20 mm) were harvested during late dry and early rainy seasons. The indigestible neutral detergent fibre (iNDF) and digestible neutral detergent fibre (dNDF) were determined by the in sacco nylon bag technique. The in vitro organic matter digestibility (OMD) of bush samples were based on the two-stage pepsin + cellulase solubility technique. Methane gas production was determined by in vitro method. The iNDF for D. cinerea and S. mellifera decreased (P < 0.0001) by 4% from late dry to early rainy season, while that of R. trichotomum increased by 13% and T. sericea increased by 3%. Digestible NDF decreased (P < 0.001) by 7% - 29% from late dry to early rainy season for all species, except S. mellifera. Species and species x season interaction affected (P < 0.0001) OMD. Except for S. mellifera, the in vitro OMD decreased (P < 0.001) from late dry to early rainy season. In vitro methane gas production of all species was higher (P = 0.0004) by 18% - 58% during the late dry season compared to the early rainy season (147.6 versus 92.0 mL/g DM). In conclusion, based on the low OMD and high iNDF, the studied species may require further intervention to improve their digestibility and feeding value.
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