Desempenho produtivo, hematologia e crescimento muscular de tilapia do nilo alimentadas com isoleucina

Abstract

O objetivo desse estudo foi avaliar a exigência dietética de isoleucina para juvenis de tilápia do Nilo com base no desempenho produtivo, respostas hematológicas e bioquímicas e crescimento muscular. Trezentos juvenis de tilápia do Nilo (18,09 ± 0,11g) foram distribuídos em 20 tanques de fibra de vidro e alimentadas com cinco rações extrusadas isoproteicas (280 g kg-1 de proteína bruta) e isoenergéticas (3000 kcal kg-1) as dietas foram formuladas continham 7,00; 8,18; 9,35; 10,53 e 11,70 g kg-1 de isoleucina. Não foram observadas diferenças (P>0,05) no desempenho produtivo, parâmetros bioquímicos e hematológicos, composição centesimal, composição corporal dos aminoácidos e crescimento muscular. A retenção corporal de isoleucina reduziu linearmente com o aumento da quantidade de isoleucina na dieta. A proteína é o nutriente com o maior custo na dieta dos peixes, assim, os resultados deste estudo contribuem para a formulação de dietas mais eficientes e com menores custos para juvenis de tilápia do Nilo.

Dietary isoleucine improved flesh quality, muscle antioxidant capacity, and muscle growth associated with AKT/TOR/S6K1 and AKT/FOXO3a signaling in hybrid bagrid catfish (Pelteobagrus vachelli ♀ × Leiocassis longirostris♂)

“…Myo bers hyperplasia and hypertrophy could partly be re ected by the frequency of myo bers diameter [71]. The frequency of myo ber smaller than 20 μm indicated hyperplasia, that frequency of myo ber lager than 50 μm denoted hypertrophy [59,72]. In the current study, the percentage of myo ber with diameters smaller than 20 μm and larger than 50 μm signi cantly rose in sh fed dietary Ile.…”

“…In the current study, the percentage of myo ber with diameters smaller than 20 μm and larger than 50 μm signi cantly rose in sh fed dietary Ile. However, a study in Nile tilapia juveniles showed dietary Ile exhibited a non-effect in the frequency of myo ber diameter [59]. The discrepancies results may be due to the differences in sh species, feeding management, and age.…”

Dietary isoleucine improved flesh quality, muscle antioxidant capacity, and muscle growth associated with AKT/TOR/S6K1 and AKT/FOXO3a signaling in hybrid bagrid catfish (Pelteobagrus vachelli♀ × Leiocassis longirostris♂)

“…In the present study, fish fed 12.5 g/kg diet increased muscle crude protein and lipid contents, indicating that dietary Ile could improve the flesh nutritional quality. Previous studies have shown that dietary Ile could significantly increase muscle crude protein and fat contents in grass carp [ 9 ] and Nile tilapia ( Oreochromis niloticus ) [ 59 ]. Besides, flesh quality is also strongly regulated by physicochemical and texture characteristics, which are the most important aspects of attracting approach to consumers [ 60 ].…”

“…The Ile, one of BCAA, have been reported the importance of effecting fish growth performance [ 9 , 14 , 59 ]. Fish growth is mainly determined by muscle growth, which constitutes the major edible sources of the fillet [ 6 , 8 ].…”

“…Myofibers hyperplasia and hypertrophy could partly be reflected by the frequency of myofibers diameter [ 71 ]. The frequency of myofiber smaller than 20 μm indicated hyperplasia, that frequency of myofiber lager than 50 μm denoted hypertrophy [ 59 , 72 ]. In the current study, the percentage of myofiber with diameters smaller than 20 μm and larger than 50 μm significantly rose in fish fed dietary Ile.…”