An experiment was carried out to investigate the effect of feeds acidified with different organic acids on apparent nutrient digestibility, faecal moisture, digesta pH and digesta viscosity of broilers. The organic acids were acetic, butyric, citric and formic acids. One hundred and fifty (150) day old Arbor-acre chicks were used. There were five treatments (T). T1 which served as control consumed feed without the organic acids, while treatments (T2, T3, T4 and T5) were offered feed treated with 0.25% acetic, butyric, citric and formic acids respectively for seven weeks. Each treatment was replicated three times with 10 birds per replicate. The experiment was arranged in completely randomized design (CRD). Feed and water were offered ad libitum. Results showed that faecal moisture and digesta pH were reduced (P<0.05) by the organic acids. Digestibility of protein, ether extract and crude fibre were improved. Feeding of acetic and butyric acids resulted to significant reduction of digesta viscosity in the duodenum. Nitrogen free extract digestibility was reduced (P<0.05) by the acids. There was no effect (P>0.05) of the acids on energy utilization. In conclusion, the organic acids could be used in diets for broilers for better gut performance.
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