Another factor limiting the wider feed use of many cropresidues is the ubiquitous occurrence of a diverse rangeof natural compounds which act to reduce nutrient utilizationand low food intake which are referred to asantinutritional factors (Osagie, 1998; Sarwar, 2012).Fermentation brings about numerous biochemical andnutritional changes in the raw materials, including thebreakdown of certain constituents, the reduction ofantinutritional factors and the synthesis of B vitamins(Egounlety and Aworh, 2000). Analysis of fermented corncobs showed a significant reduction (p<0.05) in thesaponin, oxalate, and phytate, while cyanide and tannindid not show significant changes. Saponins are steroid ortriterpinoid glycosides which are characterized by theirbitter or stringent foaming properties and their hydrolyticeffects on red blood cells. But the effectiveness of saponinsand other antinutrients depend on the amount present inthe feed and effect of pretreatment process on these feeds
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