| Grant number: | 18/19293-1 |
| Support Opportunities: | Scholarships in Brazil - Master |
| Start date: | April 01, 2019 |
| End date: | February 29, 2020 |
| Field of knowledge: | Agronomical Sciences - Fishery Resources and Fishery Engineering - Aquaculture |
| Principal Investigator: | Luiz Edivaldo Pezzato |
| Grantee: | Edgar Junio Damasceno Rodrigues |
| Host Institution: | Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil |
Abstract Phytase enzyme is employed in the feeds of monogastric animals in order to reduce anti nutritional factors of vegetable-based feed stuffs, such as phytate. However, during the thermal processing of extruded diets used in fish farms, the enzyme is exposed to high temperatures that may reduce its activity. Therefore, this study aims to evaluate the functionality of a new soybean oil-based polymer, produced according to Green's chemistry principles, as a potential thermo protector for the phytase enzyme during feed extrusion. One hundred and ninety-two juveniles of Nile tilapia (140g average weight) allocated in twelve 250L feeding tanks, using a completely randomized design in a factorial arrangement 2x3 with six treatments and six replications. The factorial arrangement consists in two types of feed processing: pelletization and extrusion versus three methods of Phytase inclusion: in an enzyme-polymer complex through adsorption, pellet coating and no phytase. The same amount of both polymer and enzyme will be included in all the experimental diets (43.1g and 1500 phytase units/kg), following the different ways of supplementation and processing described in the factorial arrangement. The juveniles will be fed four times a day until apparent satiation and its feces will be collected daily, once a day. In order to evaluate the efficiency of the polymer, phytase activity in the processed diets as well as the apparent digestibility coefficient of the nutrients in the diets will be evaluated. The data will be processed through an analysis of variance followed by Tukey's post-test, at 5% of probability. (AU) | |
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