Agriculture & Food Security (Sep 2018)
Nutritive values of seven high priority indigenous fodder tree species in pastoral and agro-pastoral areas in Eastern Ethiopia
Abstract
Abstract Background Indigenous tree and shrub species are critical feed resources for the pastoralist and agro-pastoralist areas in Ethiopia. Nutritional and mineral composition of seven high priority leguminous indigenous tree species, (Acacia nilotica, Acacia tortilis and Tamarindus indica) and non-leguminous species (Berchemia discolour, Cordia sinensis, Dobera glabra and Ziziphus spina-christi) were characterized to inform decisions on the species utilization and domestication. Method Data on a total of 17 nutritional factors were generated on leaf samples from 10 to 12 trees per species following standard lab procedures. Descriptive statistics, one-way analysis of variance among species and types, and Spearman correlations between the nutritional factors were conducted. Results Result showed that there were significant differences among the species for all chemical compositions and mineral contents except for iron. The leguminous species had significantly higher mean dry matter, organic matter, lignin and in vitro digestible organic matter in dry matter, whereas the non-leguminous species had significantly higher mean total ash, neutral detergent fibre, acid detergent fibre and hemi-cellulose. Similarly, the leguminous species had significantly higher mean iron, whereas the non-leguminous species had significantly higher mean macro-minerals, Mn and Zn. Across all the species and samples analysed, the majority (69%) of the paired comparisons revealed significant associations among the chemical compositions and digestibility, whereas nearly 54% of the comparisons were significant among the mineral contents. Conclusions We conclude that the tree species investigated are important sources of protein, energy and minerals, and utilization and domestication should target both the leguminous and non-leguminous types.
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