Fatores antinutricionais da soja crua no crescimento e respostas hematológicas da tilápia do nilo

Abstract

RESUMOO objetivo do estudo foi avaliar o efeito dietético dos fatores antinutricionais da SC (soja crua) na hematologia e no desempenho produtivo da tilápia-do-nilo (Oreochromis niloticus). Foi realizada a substituição de 0,0; 15,0; 25,0 e 35,0% da proteína do farelo de soja (FS) pela proteína da SC. Neste estudo, foram avaliados o efeito da substituição do FS por SC no perfil hematológico e desempenho produtivo da tilápia após 90 dias experimentais. Foi avaliado a atividade ureática da SC, indicando a presença de fatores antinutricionais. Os parâmetros hematológicos (eritrograma e serie branca do sangue) foram avaliados. Também foram avaliados os parâmetros de desempenho produtivo. A SC afetou o ganho de peso, o consumo de ração e a retenção proteica. Além disso, foram encontrados aumento do número de neutrófilos e diminuição da concentração de albumina. A inclusão de SC na dieta da tilápia alterou o número de células brancas no sangue e prejudicou o desenvolvimento produtivo. No entanto, nenhum efeito sobre eritrograma foi observado neste estudo. Assim podemos concluir que, embora os fatores antinutricionais presentes na SC interferiram no desempenho produtivo, recomenda-se utilizar o nível de substituição da SC abaixo de 35%, por não afetar a saúde dos peixes. ABSTRACTThis study was conducted to evaluate the effect of antinutritional factors of RSB (raw soybean) on hematology and growth performance of Nile tilapia (Oreochromis niloticus). The replacement was made the levels of 0.0, 15.0, 25.0 and 35.0% of the protein in soybean meal (SBM) by the crude soy protein. In this study, the effect of replacing SBM by RSB on haematological profile and growth performance of Nile tilapia were evaluated after 90 days of feeding. Urea activity was evaluated of RSB which indicated the presence of antinutritional factors. The hematological parameters (erythrogram and white blood cell) were evaluated. The parameters of growth performance were also evaluated. RSB affected the weight gain, feed intake and protein retention. Additionally, an increase of neuthrophils count and a decrease of albumin concentration were observed. RSB inclusion in the Nile tilapia diet changed the white blood cell number and negatively affected growth development. However, no effect on erythrogram was observed in this study. We can conclude that although the antinutritional factors present in RSB interfered the growth performance, it is recommended to use the replacement level of RSB below 35%, as it does not affect fish health.

TILAPIA CULTIVATED IN A LOW-SALINITY BIOFLOC SYSTEM SUPPLEMENTED WITH <i>Chlorella vulgaris</i> AND DIFFERENTS MOLASSES APPLICATION RATES

“…In the present study, stress caused by molasses application rates of 50% (C/N 20:1) of total daily feed (BFT-50 and BFT-C50) caused significant changes in the hematocrit level and the erythrocyte counts of the fish, resulting in macrocytic anemia. The values found in the treatments with molasses application rates of 30% of total daily feed (C:N 12:1) (BFT-30 and BFT-C30) remained in the ideal range described by several authors (20 to 32% for hematocrit and 1.9 to 5.0 x 10 6 µL -1 for erythrocyte counts) (Ueda et al, 1997;Signor et al, 2010;Costa et al, 2014;Martins et al, 2017). However, the values for treatments molasses application rates of 50% of total daily feed (BFT-50 and BFT-C50) were below the recommended level (21-44% hematocrit level and 1.50 to 3.76 x 10 6 µL -1 erythrocyte count) (Tavares-Dias, 2015).…”

“…A good indicator of fish health may be hematological indices (Martins et al, 2017). In the present study, stress caused by molasses application rates of 50% (C/N 20:1) of total daily feed (BFT-50 and BFT-C50) caused significant changes in the hematocrit level and the erythrocyte counts of the fish, resulting in macrocytic anemia.…”

Population Dynamics, Fecundity and Fatty Acid Composition of Oithona nana (Cyclopoida, Copepoda), Fed on Different Diets

“…For instance, soybean, which is characterized by high protein percentage, appealing smell, low price [ 52 ], and low content of specific anti-nutrients, including oligosaccharides and allergic proteins [ 53 ]. However, the growth of O. nana in the present study with soybean had the lowest rate compared with other tested diets, which could be due to the high concentration of soybean meal, or nitrogen wastes and induced toxicity [ 54 ]. In the study of El-khodary et al [ 27 ] who found that Cyclops fed on soybean had high density (27 individuals mL −1 ) but this diet provided low nutritional value compared with those fed on microalgae.…”

Effects of processing full‐fat soya beans and fish trim for sustainable sablefishAnoplopoma fimbriafeeds

“…The 58% boiled FFSB treatment group also had the highest body lipid content. In a different study, replacing soya bean meal protein with raw soya beans in tilapia diets at levels of 15%, 25% and 35% affected the weight gain, feed intake and protein retention (Martins et al, 2017). HSI and whole‐body lipid content were lowest in the 35% group in addition to fish having a significantly higher plasma neutrophil count.…”