Digestibilidad aparente de materia seca, proteína y energía de harina de vísceras de pollo, quinua y harina de pescado en tilapia nilótica, Oreochromis niloticus

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).