<b>Apparent digestibility and supplementation of phytase in vegetable feedstuff for Nile tilapia</b> - DOI: 10.4025/actascianimsci.v26i3.1795

Abstract

Vegetable feedstuff used in commercial fish diets contains antinutrients, such as phytate, molecule able to complex minerals, amino acids, starch and, which can also acts in a negative way on the digestive enzymatic reactions. Thus, this study aimed to evaluate the effect of phytase enzyme (0; 1,000; 2,000 UF/kg) on the apparent digestibility of five energetic feedstuff (corn, extruded corn, wheat middling, rice meal and sorghum) and five protein feedstuff (soybean meal, extruded soybean meal, sunflower meal, cottonseed meal and gluten meal) using an albumin-gelatin diet and 0.10% of chromic oxide (Cr2O₃), as indicator. Apparent digestibility coefficient (ADC) of dry matter, crude protein and gross energy were determinated. One hundred Nile tilapia juveniles, 100.0g average weight, were stocked in 10 cages for feeding and feces collect. Phytase acts in different way on vegetable feedstuffs. The digestible values of dry matter, crude protein and gross energy depend on the biological values of feedstuffs, concentration and nature of phytate and enzyme level supplementation.