Suplementação de vitamina A durante a maturaçao gonadal de fêmeas de astyanax altiparanae (characiformes: characidae)
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2019-06-26
Autores
Silva, Joseane
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Universidade Estadual Paulista (Unesp)
Resumo
Este estudo investigou a influência da suplementação de vitamina A sobre a maturação ovariana de fêmeas do lambari-do-rabo-amarelo, Astyanax altiparanae. 580 fêmeas adultas foram distribuídas em 10 tanques de 750 litros, compondo 5 tratamentos (duplicata). Foi formulada uma ração com baixo nível de vitamina A, as rações foram suplementadas com 0; 1.800; 3.600; 7.200 e 14.400 UI/kg de ração. Após 8 dias de ajuste às condições experimentais com dietas comerciais, os peixes receberam uma dieta sem suplementação de vitamina A durante 16 dias, para a depleção dessas reservas e em seguida os animais foram alimentados por 60 dias com os diferentes tratamentos. Indicadores de maturação gonadal como concentração plasmática de 17β-Estradiol (E2), índice gonadossomático (IGS), fecundidade e histologia ovariana foram analisados aos 30 e 60 dias. Além destes, indicadores metabólicos, como o índice hepatossomático (IHS), viscerossomático (IVS) e concentração plasmática de lipídios totais, triglicérides, colesterol total e frações também foram analisados nestes momentos. Os diferentes níveis de vitamina A alterou o padrão de deposição ovariana desta vitamina. A manutenção nas condições experimentais promoveu a maturação ovariana, avaliada pela histologia do ovário e IGS. As variáveis fisiológicas mostraram que a manutenção das fêmeas com uma dieta composta integralmente por ingredientes vegetais, reduziu a concentração plasmática de lipídio e colesterol total e o nível mais elevado de suplementação (14.400 UI/kg) reduziu ainda os níveis plasmáticos de LDL. Adicionalmente, uma concentração intermediária de suplementação (3.600 UI/kg), fornecida por 60 dias aumentou a concentração plasmática de E2, mas o mecanismo que modula esta alteração não foi estudado
This study investigated the influence of vitamin A supplementation during the ovarian maturation of female lambari-do-rabo-amarelo, Astyanax altiparanae. 580 adult females were distributed in 10 tanks of 750 liters, composed by 5 treatments (duplicate). A basal diet with low level of vitamin A. The diet was supplemented with 0; 1.800; 3,600; 7,200 and 14,400 IU / kg of diet. After 8 days of adjustment to the experimental conditions with commercial diets, the fish received a diet without vitamin A supplementation for 16 days, for the depletion of these reserves and the animals were fed for 60 days with different treatments. Indicators of gonadal maturation, such as 17β-Estradiol (E2) plasma level, gonadosomatic index (GSI), fecundity and ovarian histology were analyzed at 30 and 60 days. Additionally, metabolic indicators such as hepatosomatic index (HSI), viscerosomal index (VSI) and plasma concentration of total lipids, triglycerides, total cholesterol and fractions were also analyzed at these periods. Vitamin A supplementation levels altered the deposition levels of this vitamin in the ovaries. The maintenance in the experimental conditions promoted ovarian maturation, evaluated by ovary histology and GSI. The physiological variables evidenced that the maintenance of these females in the experiment, with a diet composed entirely of vegetable ingredients, reduced the plasma levels of total lipids and cholesterol, and the higher level of supplementation (14,400 IU / kg) reduce also LDL levels. In addition, an intermediate concentration of supplementation (3,600 IU / kg) administered for 60 days increased the plasma levels of E2, but the mechanism that modulates this alteration has not been studied. Key words: Estradiol, lambari, lipid profile, vitamin A.
This study investigated the influence of vitamin A supplementation during the ovarian maturation of female lambari-do-rabo-amarelo, Astyanax altiparanae. 580 adult females were distributed in 10 tanks of 750 liters, composed by 5 treatments (duplicate). A basal diet with low level of vitamin A. The diet was supplemented with 0; 1.800; 3,600; 7,200 and 14,400 IU / kg of diet. After 8 days of adjustment to the experimental conditions with commercial diets, the fish received a diet without vitamin A supplementation for 16 days, for the depletion of these reserves and the animals were fed for 60 days with different treatments. Indicators of gonadal maturation, such as 17β-Estradiol (E2) plasma level, gonadosomatic index (GSI), fecundity and ovarian histology were analyzed at 30 and 60 days. Additionally, metabolic indicators such as hepatosomatic index (HSI), viscerosomal index (VSI) and plasma concentration of total lipids, triglycerides, total cholesterol and fractions were also analyzed at these periods. Vitamin A supplementation levels altered the deposition levels of this vitamin in the ovaries. The maintenance in the experimental conditions promoted ovarian maturation, evaluated by ovary histology and GSI. The physiological variables evidenced that the maintenance of these females in the experiment, with a diet composed entirely of vegetable ingredients, reduced the plasma levels of total lipids and cholesterol, and the higher level of supplementation (14,400 IU / kg) reduce also LDL levels. In addition, an intermediate concentration of supplementation (3,600 IU / kg) administered for 60 days increased the plasma levels of E2, but the mechanism that modulates this alteration has not been studied. Key words: Estradiol, lambari, lipid profile, vitamin A.
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Perfil lipídico, Lambari, Estradiol, Vitamina A