MINERAL PROFILE ANALYSIS OF OILSEEDS AND THEIR BY-PRODUCTS AS FEEDING SOURCES FOR ANIMAL NUTRITION
Keywords:
oilseeds, oilseed cakes, mineral content, macroelements, microelementsAbstract
The aim of this study was to determine dry matter (DM) and crude ash content, as well as minerals content of oilseeds and their by-products, cakes. Four samples of oilseeds (sunflower, soybean, flaxseed and rapessed) were analysed as seeds and cakes. Analyzed crops were grown in University Experimental Farm in Kolíňany. Cakes were obtained by using pressing unit FARMER 10. Dry matter and crude ash were determined by standard laboratory methods and procedures. Mineral nutrients profile analysis was performed by using the High Resolution Continuum Source Atomic Absorption Spectrometer contrAA 700 for calcium (Ca), magnesium (Mg), sodium (Na), potassium (K), zinc (Zn), copper (Cu), iron (Fe), manganese (Mn). To analyze phosphorus (P) content 6400 Spectrophotometer was used. Significant differences (P<0.05) in DM and crude ash content, as well as in mineral composition of analyzed seeds and cakes were found. The most represented macroelements were K (soybean seed and soybean cake over 20 g.kg-1 of DM) and P (rapeseed cake 12.23 g.kg-1 of DM and sunflower cake 11.42 g.kg-1 of DM). On the other hand, Na was present in the analyzed samples the least, mostly below 1 g.kg-1 of DM. From microelements, the highest values were observed for Fe (with the maximum for rapeseed cake 107.94 mg.kg-1 of DM and soybean cake 88.97 mg.kg-1 of DM) and Zn (with the maximum for sunflower cake 58.94 mg.kg-1 of DM and rapeseed cake 52.38 mg.kg-1 of DM). Rapeseed and rapeseed cake have significantly (P<0.05) proven to be the richest in Mn content (32.96 mg.kg-1 of DM and 54.07 mg.kg-1 of DM, respectively), but on the other hand they contained the least amount of Cu (6.82 mg.kg-1 of DM and 8.90 mg.kg-1 of DM, respectively).
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