Desenvolvimento de um sistema de recirculação para estudos sobre digestibilidade em condições de alto desempenho para camarões marinhos: avaliação de ingredientes protéicos alternativos à farinha de peixe em diferentes níveis de inclus / Development of a recirculated system for digestibility studies in high performance conditions for marine shrimp: evaluation of alternative protein sources to fish meal in different dietary inclusion levels for Litopenaeus vannamei juveniles

AUTOR(ES)

Rodrigo Antonio Ponce de Leon Ferreira de Carvalho

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

02/06/2011

RESUMO

This thesis focused on the validation of an aquaculture recirculation system (RAS) for shrimp digestibility studies and the determination of the digestibility coefficients of protein sources at different inclusion levels for shrimp feeds. The recirculation system for digestibility studies proved to be adequate for its purpose and shrimp growth rates was equal to or higher than those experienced in the farms. The recirculated system comprised the Project of a tank for shrimp digestibility studies with marine shrimp which permitted the output of high quality faecal samples in quantity, reliability in the shorter time as possible. Among the systems evaluated the Guelph-L was the most efficient as it combined a high solids removal efficiency with an reasonable water velocity profile and the shortest distance for the feces and feed particles from the tank bottom to the collection tube. The digestibility trials were conducted with six protein sources: fish meal (FPX), soy protein concentrate (CPS), poultry by product meal (FVI), corn gluten meal (GLM), meat and bone meal (FCO) and hydrolyzed feather meal (PEN) at the inclusion rates of 10, 20 and 30% showed that the apparent digestibility of the protein sources was significantly affected by their inclusion levels in the test diets and this effect was more intense for the protein sources corn gluten meal and poultry by product meal, that displayed the greatest amino acids imbalance. The ingredients that presented the highest coefficients for the apparent dry matter, protein and energy digestibility and amino acids availability was fish meal and soy protein concentrate and the lowest cost for the digestible protein and energy was meat and bone meal, soy protein concentrate and hydrolyzed feather meal. The growth rates, survival and economical feed conversion ratio was significantly affected by the ingredient type, contrary to the inclusion level, and presented the following growth rate in g week-1 order: FPX >CPS >PEN >FVI >FCO >GLM. The diet apparent digestibility coefficients described weekly growth rate better than ingredient apparent digestibility coefficients, despite the weak correlation.

ASSUNTO(S)

litopenaeus vannamei amino acids availability desempenho. digestibilidade digestibility disponibilidade de aminoácidos feed ingredients fish meal replacement ingredientes para ração litopenaeus vannamei performance. recirculated system sistema de recirculação substituição da farinha de peixe

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