Amino Acid Profiles and Apparent Digestibility of Dry Matter and Crude Protein of Seaweeds and Other Selected Plant Ingredients for Javan Rabbitfish, Siganus javus Asda Laining(1*), Ramadhan(2), Rosni(3), SRH Mulyaningrum(1), Lideman(1), Tuti Asriani(3), Titin Kurniasih(1)
1)* Research Center for Fishery, National Research and Innovation Agency, Cibinong, Bogor, Indonesia
2) Research Institute for Coastal Aquaculture and Fisheries Extension (RICAFE), Ministry of Marine Affairs and Fisheries, Maros 90512, South Sulawesi, Indonesia
3) Research Center for Conservation of Marine and Inland Water Resources, National Research and Innovation Agency, Cibinong, Bogor, Indonesia
Abstract
A series of digestibility experiments were conducted to determine the apparent digestibility coefficients of dry matter (ADMD) and crude protein (ACPD) for three cultured seaweeds and other five plant-selected ingredients for Javan rabbitfish, Siganus javus. In each of the two subsequent experiments arranged into Completely Randomized Design, five diets consisting of a reference diet and other 4 diets were fed to white-spotted rabbitfish (130-150 g). Test feed ingredients were substituted with 30% of the portion of the reference diet. The inert marker used was 0.8% chromic oxide (Cr2O3). The fecal collection was carried out by sedimentation using a 200- l cylindro-conical tank fitted with a collecting chamber. Among the plant origins, soybean cake meal (SCM) contained the highest total amino acid, TAA 21.37%) followed by aquatic weed Ceratophyllum (20.75%) and the lowest was yellow corn (6.35%). Gracilaria had 11.30% of the TAA higher than the other two seaweeds. In experiment 1, the ACPD ranged from 74.9-95% and the ADMD ranged from 41.6-85.2% where Gracilaria had the significantly highest values for both digestibilities of 95.0% and 84.7%, respectively. In experiment 2, the ACPD ranged from 75.6-86.4% and the ADMD ranged from 71.1-85.2%. The significantly highest coefficient of both ACPD and ADMD occurred in Eucheuma seaweed. Except for the ADMD of soybean cake meal, the Javan rabbitfish well digested both for protein and dry matter of plant ingredients particularly the three seaweeds
