Banca de DEFESA: ARTURO MELENDEZ AREVALO
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.DISCENTE : ARTURO MELENDEZ AREVALO
DATA : 07/06/2019
HORA: 09:00
LOCAL: EMBRAPA -CTAAA- PLANTA IV
TÍTULO:
EVALUATION OF PHYSICAL PARAMETERS OF PELLETS ELABORATED BY EXTRUSION FOR TILAPIA WITHOUT ADDING FISH MEAL
PALAVRAS-CHAVES:
Aquaculture, food, raw material, extrusion, pelleting
PÁGINAS: 104
GRANDE ÁREA: Ciências Agrárias
ÁREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Tecnologia de Alimentos
ESPECIALIDADE: Tecnologia de Produtos de Origem Vegetal
RESUMO:
The objective of the present study was to evaluate the effect of the extrusion process variables of two diets formulated with two levels of inclusion of soybean meal and meat and bone meal as the protein sources, in order to seek the best cost/benefit without impairing its value nutritional. A review of the literature on the importance of the quality of available raw materials, the advantages and disadvantages of the two commonly used manufactures in feed manufacturing (pelleting and extrusion) and the economic aspects related to the substitution of ingredients in the rations. Analyzes of results reported in the literature indicate that extruded feeds are of superior quality compared to those obtained using the pelletized process, and that extrusion is more economical and responsive to aquaculture needs than pelleting. Subsequently, the formulation of the diets was carried out based on the literature information and the physical-chemical evaluations of commercial diets for comparison purposes. Two experiments were carried out, each of 4 experiments of 250g of samples from the experimental diets named A and B containing as the source of proteins 25 and 10% of soybean meal, 40 and 55% of meat and bone meal, totaling 8 experiments in total. In the first processing, the two diets were processed at 28 and 40% final moisture levels, totalizing four trials (A28, B28, A40, B40). In the second experiment, four tests were performed with levels 20 and 25% of final moisture (A20, B20, A25, B25). For the extrusion process a single screw extruder Brabender, model 20DN was used. Barrel temperatures in the three zones were set at 50, 80, 100°C and the screw speed was 150 rpm. The resulting pellets were evaluated for the degree of expansion, density, water absorption, and solubility, pasting properties, X-ray diffraction, centesimal composition, minerals, and amino acid profile. It is concluded that the pellets may have a higher density, not only due to their formulation, but also due to their cooking degree in the process, this caused changes in pellet expansion, water absorption, pasting viscosity, and even in X-ray diffraction characteristics, showing different values of crystallinity. From the point of view of the amino acid quality, when the feeds are properly processed, it presents a higher percentage, and therefore with greater benefit in fish nutrition. The minerals present, the proportion of Ca and P, are considered adequate in the formulated feeds, being smaller in the commercial feeds. It is concluded that depending on the ingredients, their proportionality, it is possible to feed formulate with adequate amino acid balance, good micro, and macro mineral profile. When referring to the essential amino acids contents, which are determinants for the good development and fish quality, the parameters used in the extrusion are factors that should consider, because losses are reduced due to excessive heating during the cooking and pelletizing of the rations.
MEMBROS DA BANCA:
Presidente - 105.290.788-13 - JOSÉ LUIS RAMIREZ ASCHERI - UNICAMP
Interno - 3333721 - GESILENE MENDONCA DE OLIVEIRA
Interno - 170.726.462-72 - OTNIEL FREITAS SILVA - EMBRAPA
Externo ao Programa - 2376201 - LEONARDO ROCHA VIDAL RAMOS
Externo à Instituição - FELIX EMÍLIO PRADO CORNEJO - EMBRAPA
Externo à Instituição - FABIOLA HELENA DOS SANTOS FOGAÇA - EMBRAPA
Externo à Instituição - RENATA TORREZAN - EMBRAPA