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Phosphorous and protein digestibility in phytase-supplemented rations in tilapia, Oreochromis sp.

Author(s): Wilson E. Rueda-Uribe | Wálter Vásquez-Torres | Mariana C. Gutiérrez-Espinosa

Journal: Orinoquia
ISSN 0121-3709

Volume: 16;
Issue: 1;
Start page: 21;
Date: 2012;
Original page

Keywords: Nutrition | apparent digestibility coefficient | phytic acid | fish

AbstractThe present study was aimed at evaluating the effect of phytase supplement on the digestibility of phosphorous and protein in corn gluten (CG), hard wheat flour (HWF) and whole soya (WS) in red tilapia (Oreochromis sp.) diets. The chromium III oxide indirect labelling method was used for calculating the coefficients; fish faeces were collected using the modified Guelph system. Juvenile red tilapia weighing 100 g were selected. The rations consisted of reference diet (RD) (69.5%), 0.5% inert marker (chromium III oxide), the ingredient to be evaluated (30%) and phytase in 0.0, 500 and 1,000 units of phytase (PU)/kg diet for each of them. The apparent digestibility coefficients (ADC) for the proteins obtained were 94.7%,84.5% and 90.3% without including phytase, 95.1%, 84.1% and 89.3% with 500 PU and 97.6%, 90.8% and 92.9% with 1,000 PU for CG, HWF and WS respectively. Regarding phosphorous ADC, the results for CG varied from 30.7% to 69.8%,46.6% to 51.1% for HWF and 44.0% to 54.7% for WS. WS and HWF protein and phosphorous ADC were not significantly affected by added phytase level (p>0.05); however, protein and phosphorous ADC tended to be greater when 1,000 PU were added. CG protein ADC had significant differences between the diet including 0 PU of phytase and that containing 1,000 PU (p
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