Pengaruh Pemberian Berbagai Dosis Pebiotik Inulin Yang Diekstrak Dari Ubi Jalar Terhadap Konsumsi dan Efisiensi Pakan Ikan Nila (Oreochromis niloticus, Linnaeus 1758) = Effect of various doses of prebiotic inulin extracted from sweet potato on feed consumption and efficiency of tilapia (Oreochromis niloticus, Linnaeus 1758)

Background. High feed prices cause high production costs, so additional materials are needed that can improve the quality and efficiency of the feed given, one of which is the use of inulin prebiotics extracted from sweet potatoes. Objective. To determine the best dose of inulin extracted from sweet potatoes on the consumption and efficiency of tilapia feed. Method. The study used a completely randomized design (CRD) consisting of 5 treatments and 3 replications of inulin doses extracted from sweet potatoes in feed, namely 0, 1.5, 2.5, 3.5 and 4.5 mL/kg combined with a mixture of microorganisms (Bacillus sp., Rhizopus sp., and Saccharomyches sp). Tilapia with a length of 2.33±0.20 cm and a weight of 1.01±0.06 g, were kept in an aquarium for 50 days. Feeding was carried out 3 times a day in the morning, afternoon and evening as much as 7% of the biomass weight. Results. Analysis of variance showed that the treatment of inulin doses extracted from sweet potatoes did not have a significant effect (p>0.05) on feed consumption, but had a significant effect (p<0.05) on tilapia feed efficiency. Feed consumption values ranged from 157.63 ± 17.59 - 174.36 ± 13.16. The highest feed efficiency was found at an inulin dose of 3.5 mL/kg with a value of 154.82 ± 12.47 followed by an inulin dose of 2.5 mL/kg with a value of 147.25 ± 11.92, then an inulin dose of 4.5 mL/kg with a value of 113.84 ± 36.89 and the lowest dose of inulin 1.5 mL/kg with a value of 99.10 ± 38.26 followed by an inulin dose of 0 mL/kg with a value of 64.98 ± 3.34. Conclusion. Prebiotic inulin extracted from sweet potato did not affect fish feed consumption, but increased fish feed efficiency at the best dose of 2.5 mL/kg.

Keywords: Tilapia; prebiotic; inulin; sweet potato; feed consumption; feed efficiency.