Mineral composition and variation in metabolizable energy of browse forages estimated using in vitro gas production and regression equations
Abstract
Metabolizable energy (ME) contents of Poupartia sirrea, Prosopis africana. Pterocarpus erinceus, Sterculia setigera, Tamarindus indica, Vitex cuneata, Vitex doniana, Ziziphus abyssinica, Ziziphus mauritiana, Ziziphus spinacristi were predicted by the in vitro gas production technique using different regression equations obtained from previous experiments. The forage samples were also analyzed to determine their chemical and some micro minerals (Na, K, Ca, P and Mg) and micro minerals (Mn, Fe, Zn, Ni, Co and Se) composition. There were significant (P<0.05) difference between forages in terms of ME content. There were also significant difference (P<0.05) between ME contents of each forage predicted using different equations. The regression equation for prediction of ME had significant effect (p>0.05) on ME of forages. This resulted in different rank orders of forages based on ME. Therefore ME contents of forages predicted by gas production method using different regression equations obtained from previous experiments cannot be considered absolute. The results of the micro minerals showed significant difference among browse forages except for sodium (Na). The results for calcium (Ca), phosphorus (p), magnesium (Mg) and potassium (K) ranged from 0.54 to 1.25, 11.20 to 44.25.0.18 to 0.56 and 1.20 to 12.00 mg g-1 DM, respectively. The results also showed significant differences for Fe, Zn and Mn with values ranging from 1.62 to 6.22, 1.064 to 6.528 and 0.172 to 3.828 mg g-1 DM respectively. In conclusion the results of the macro and micro minerals are well within range and as such can sustain the mineral requirement of the various species of livestock. The use of gas production method cannot be considered absolute since ME values is affected by many factors.
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References
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