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Nutritive value and in-vitro digestibility of peels and pomaces of different citrus species
(Hellenic Veterinary Medical Soc, 2023) Olowu, O. O.; Firincioglu, S. Yaman
The chemical composition and in-vitro digestibility of bitter orange (Citrus aurantium), Grapefruit (Citrus paradisi), mandarin (Citrus reticulata), lemon (Citrus limon) and orange (Citrus sinensis) peels and pomaces were assessed for their ability as alternative feed. Chemical composition assessment was done through chemical analysis, and ANKOM Daisy II incubator was used to determine the in-vitro digestibility. There was no statistical significance between citrus byproducts in terms of chemical composition (p>0.05). The citrus by-products had high amounts of total phenolic content (p <= 0.01). The in-vitro digestibility of the peels was significantly higher than the pomaces (p<0.001). The five citrus species in this study showed high metabolizable energy and are viable as non -for-age energy sources in ruminant feed. Lemon byproducts had higher protein compared to others but not sufficient as a single protein source while bitter orange pomace had higher total phenolic content and digestibility. The abundance of citrus agro-industrial byproducts, their chemical composition and their digestibility makes it a good consideration for ruminant feed modification.