Effect of Fermented Rice Bran used as Feed Ingredient on Apparent Digestibility Coefficient of Tilapia (Oreochromis niloticus) Feed

Abstract

This study aimed to investigate the effect of fermented rice bran used as a feed ingredient on the apparent digestibility coefficient (ADC) of tilapia feed. The fermentation process was conducted under aerobic conditions using 2% Aspergillus niger for 24 hours. Moreover, three different types of feed were prepared with 3 replicates and these include treatment A (reference feed), B (unfermented rice bran feed), and C (fermented rice bran feed). These treatments were provided for the tilapia for 30 days. Meanwhile, the tilapia used had an average weight of 5 g/fish and reared using a recirculation system with a density of 16 fish/aquarium. The results showed that the value of ADCenergy (78.11%) in treatment C was significantly highest (P<0.05) compared to other treatments, while the lowest was in treatment B with 72.24%. The values of ADCdry matter (67.56%) and feed efficiency (64.20%) in treatment C were also higher (P<0.05) compared to treatment B with 57.02% and 54.74% respectively. However, there was no significantly difference (p>0.05) in the value of ADCprotein, ADClipid, and SGR among the treatments. These results indicate the rice bran fermented using A. niger is potential to be used as a raw material ingredient for tilapia feed.