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.

Improving quality of cassava peel meal as raw material for tilapia feed

“…Anwar et al (2020) (2014) who reported that the digestibility of protein and fat in A. niger fermented copra meal-based feed were significantly higher than the unfermented one in milkfish rearing. Putra et al (2021) also obtained the same results, where the A. niger fermented rice bran-based feed had higher dry matter digestibility and energy value (P<0.05) in tilapia compared to the unfermented feed.…”

“…The temperature range in this study was 28.3-30.3 o C, pH 8.16-8.22, DO 5.2-5.8 and ammonia 0.0048-0.006 ppm. Based on Begum et al (2014), the value of water quality parameters in this study Putra et al (2022) is still within the range of water quality values for tilapia rearing.…”

“…According to Pallinggi et al (2014), the decrease in the crude fiber value of fermented materials is due to the digestion by microbes. Putra et al (2021) also stated that A. niger fermentation led to the breakdown of indigestible materials such as cellulose and hemicellulose into simple sugars. This result is in line with Shi et al (2015) who reported that A. niger is a beneficial microorganism that can reduce the fiber content of material through the production of fiberdegrading enzymes during the fermentation process.…”

“…Similar results were found by Putra et al (2018) on rearing tilapia using Moringa leaf-based feed. Putra et al (2021) also stated that there was no difference in the feed consumption between the A. niger unfermented and fermented rice bran-based feed by A. niger.…”

“…Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Volume 11, Number 3, Page 319-326 Putra et al (2022) Fermentation using microorganisms is an effective approach to reduce the content of crude fiber and anti-nutrients in fish feed raw materials (Sun et al, 2015). Most anti-nutritional substances do not directly cause death in fish but potentially affect physiological processes, by inhibiting growth and decreasing the immune system (Dawood and Khosio, 2020).…”