Abstract
With the objective of evaluating the soybean oil replacement by tilapia oil and poultry oil for Nile tilapia fingerlings, 240 reversed tilapia fingerlings with an individual weight of approximately 0.6 ± 0.11 grams that were stored in 30 aquariums of 50 liters (6T x 5R), in the quantity of 8 units / aquarium, where they were fed with 65% lipid rations containing soybean oil (SO), tilapia oil (TO), poultry oil (PO), and their SO+TO, SO+PO, TO+PO mixtures of equal parts as a lipidic source in practical diets during 50 days. The performance parameters, the carcass composition and the fatty acids content both on the fillet and the innards were verified. The performance, survival, weight gain, and the feeding conversion characteristics were not influenced by the diet. The carcass composition on both the fillet and the innards were not influenced by the source of lipids in the content of moisture and lipids. In general, the fatty acids profile reflected the diets one with the decrease of polyunsaturated fatty acids and the increase of saturated and monounsaturated fatty acids with the replacement. Therefore, tilapia oil, poultry oil, as well as their mixtures can totally or partially replace the soybean oil in diets for Nile tilapia fingerlings without injury to the performance.
Highlights
With the objective of evaluating the soybean oil replacement by tilapia oil and poultry oil for Nile tilapia fingerlings, 240 reversed tilapia fingerlings with an individual weight of approximately 0.6 ± 0.11 grams that were stored in 30 aquariums of 50 liters (6T x 5R), in the quantity of 8 units / aquarium, where they were fed with 65% lipid rations containing soybean oil (SO), tilapia oil (TO), poultry oil (PO), and their SO+TO, SO+PO, TO+PO mixtures of equal parts as a lipidic source in practical diets during 50 days
Nwanna & Bolarinwa (2000) detectaram que diferentes fontes lipídicas afetaram os teores de gordura corporal de juvenis de tilápia do Nilo, assim como Gunasekera et al (2002) revelaram que diferentes fontes lipídicas alteraram o teor de lipídios corporais de enguias (A. australis)
Entretanto, alguns outros autores, tais como Martino et al (2002), (Grisdale-Helland et al, 2002), Ng et al (2003) e Regost et al (2003) não revelaram diferenças significativas na composição corporal dos animais quando da substituição de diferentes fontes de lipídios
Summary
Experimentalmente, foram utilizados 240 alevinos, com peso individual aproximado de 0,6 g, estocados em 30 aquários (oito alevinos/aquário) de 50 litros, equipados com aquecimento e aeração. A temperatura foi medida duas vezes por dia, enquanto o pH, oxigênio e condutividade foram medidos a cada três dias. Os ingredientes componentes das rações foram moídos em moinho-faca com peneira 0,5 mm de diâmetro, e após a mistura foram umedecidas com água a 50 C, passando posteriormente pelo processo de peletização em moinho elétrico. Os pellets foram secados em estufa de ventilação forçada a 55°C por 24 horas, microtriturados e peneirados em diferentes malhas para adequação e uso conforme o tamanho da boca dos alevinos, cuja composição consta na Tabela 1. Rações com diferentes níveis de óleo de tilápia e óleo de vísceras de aves, em rações para alevinos
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