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ORINOQUIA

On-line version ISSN 0121-3709

Abstract

GUTIERREZ-ESPINOSA, Mariana C.; YOSSA-PERDOMO, Martha I.  and  VASQUEZ-TORRES, Walter. Apparent digestibility of dry matter, protein and energy regarding fish meal, poultry by-product meal and quinua for Nile tilapia, Oreochromis niloticus. Orinoquia [online]. 2011, vol.15, n.2, pp.169-179. ISSN 0121-3709.

The purpose of this study was to determine protein (ADCp) and energy (ADCe) apparent digestibility coefficients (ADC) for fish meal (FM), poultry by-product meal (PBM) and quinoa flour (Chenopodium quinoa) (QF) used in feeding Nile tilapia (Oreochromis niloticus). The indirect method with a chromium oxide marker was used to estimate the aforementioned ADC; faeces were collected by the modified Guelph system. Tilapias having an average 130 g weight were fed on an experimental diet consisting of reference diet (RD) (89.5 %, 79.5 % or 69.5 %), 0.5 % inert marker (chromium dioxide) and the ingredient to be evaluated to assess 10 %, 20 % or 30 % inclusion level. The fish were fed every hour for 12 hours per day and their faeces were collected 10 hours after the fish had been fed; the samples were dried at 60ºC and stored at -17°C until analysed. Chromium oxide level was determined by the acid digestion method. The ADCp for the three inclusion levels (10 % 20 % and 30 %) were respectively: 88.1 %, 89.4 % and 90.9 % for FM, 96.8 %, 94.9 % and 94.1 % for PBM and 67.7 %, 73.5 % and 77.5 % for QF. There were no significant differences (p<0.05) concerning ADCp inclusion levels regarding the three materials being investigated. As for ADCe, the results ranged from 53.0 % to 88.5 % for FM, 52.6 % to 59.7 % for PBM and 29.0 % to 66.1 % for QF. Including 30 % FM had the highest ADCe (p> 0.05); there were no significant differences between PBM inclusion levels and QF was significantly lower (10 % inclusion level).

Keywords : Apparent digestibility coefficient; nutrition; alternative matter; proximate analysis.

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