Orinoquia

Orinoquia, Volumen 22, Número 1, p. 48-56, 2018. ISSN electrónico 2011-2629. ISSN impreso 0121-3709.

Parámetros productivos y hematológicos de Piaractus brachypomus suplementados con ácido ascórbico y sometidos a estrés por hipoxia

Productive and hematological parameters of Piaractus brachypomus supplemented with ascorbic acid and subjected to hypoxia stress

Parámetros produtivos e hematológicos de Piaractus brachypomus suplementados com ácido ascórbico e submetidos ao estresse pela hipóxia

Adriana S. Corredor-Castillo, Miguel A. Landines-Parra

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Resumen (es)

Se evaluó el efecto de la suplementación con vitamina C sobre algunos parámetros productivos y hematológicos de cachama blanca sometida a estrés por hipoxia aguda. Fueron utilizados 72 juveniles (30±4,76g),los cuales fueron alimentados ad libitum durante 30 días con dieta de 32% de proteína y diferentes niveles de vitamina C: T1:0 mg/kg; T2:100 mg/kg; T3:200mg/kg; T4:400 mg/kg; T5:800 mg/kg; T6:1600 mg/kg. El día 30, los animales fueron sometidos a exposición aérea durante 60 segundos y devueltos al agua. Se tomaron muestras de sangre a los 5, 30, 60 y 360 minutos, para determinación de hematocrito, hemoglobina, recuento celular (rojas y blancas), conteo diferencial de leucocitos, volumen corpuscular medio (VCM), hemoglobina corpuscular media (HCM) y concentración de hemoglobina corpuscular media (CHCM). Los pesces fueron pesados para calcular ganacia de peso (GP), tasa de crecimiento específico (TCE), crecimiento relativo (CR) y supervivencia. Los datos fueron sometidos a análisis de varianza (ANAVA) y las medias comparadas por prueba de Tukey (5%). Hubo diferencias significativas para GP, TCE y CR, parámetros en los que el T2 fue el mejor. Asimismo, hubo diferencias significativas para los monocitos entre T1 y T4, T5 y T6 en el primer muestreo, mientras que para basófilos, linfocitos, neutrófilos y eosinófilos no se observaron diferencias entre tratamientos ni tiempos. La supervivencia fue del 100% en todos los tratamientos. Los resultados sugieren que la suplementación con vitamina C en la dieta podría favorecer el crecimiento de la especie, pero que niveles excesivos (1600 mg/kg) pueden tener efectos adversos. Por otro lado, aunque hubo diferencias significativas entre tratamientos en el número de leucocitos y el porcentaje de monocitos, los parametros hematológicos evaluados permanecieron constantes ante la condición de hipoxia aguda, independientemente del nivel de consumo de la vitamina.

Palabras clave (es)

ácido ascórbico; hipoxia; parámetros hematológicos; parámetros productivos; Piaractus brachypomus

Resumen (en)

This experiment evaluated the effect of the supplementation of vitamin C on some productive and hematological parameters of cachama blanca submitted to acute hypoxia. 72 juveniles (30 ± 4.76 g) were used. They were fed ad libitum during 30 days with a diet of 32% of protein and different levels of vitamin C as follows: T1:0 mg/kg; T2:100 mg/kg; T3:200mg/kg; T4:400 mg/kg; T5:800 mg/kg; T6:1600 mg/kg. On day 30 the animals were sujected to aerial exposition during 60 seconds and returned to the water. Blood samples were taken at 5, 30, 60 and 360 minutes, to determine hematocrit, hemoglobin, cell count (red and white), leukocytes differential count, mean corpuscular volume, (MCV), mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC). All animals were weighted to calculate weight growth (WG), specific growth rate (SGR), and relative growth (RG). Finally, survival rate was determined. The data were analyzed using variance analysis (ANOVA) and the means were compared using the Tukey’s test (5%). There were significant differences for WG, SGR, RG. T2 had the best parameters. The number of leukocytes was significatively higher in T5 in all sampling times. There were significative differences for monocytes among T1 and T4, and T5 and T6 in the first sampling, while for the basophils, lymphocytes, neutrophils and eosinophils there were not any differences among treatments or sampling times. Survival was 100% in all treatments. The results sugest that the supplementation with vitamine C in the diet could favour the growth of the species (WG, SGR, RG), but that excesive levels (1600 mg/kg) could have adverse effects on these parameter. On the other hand, although there were significative differences among treatments in the number of leukocytes and the percentage of monocytes, the hematological parameters evaluated, remained constant in relation to the condition of acute hypoxia, independently of the level of vitamin consumption.

Palabras clave (en)

ascorbic acid; hypoxia; hematological parameters; productive parameters; Piaractus brachypomus

Resumen (pt)

Foi avaliado o efeito da suplementação com vitamina C em alguns parâmetros produtivos e hematológicos da cachama branca submetida à hipóxia aguda. Foram utilizados 72 juvenis (30 ± 4,76 g), que foram alimentados ad libitum por 30 dias com uma dieta de 32% de proteína e diferentes níveis de vitamina C, constituindo os seguintes tratamentos: T1:0 mg/kg; T2:100 mg/kg; T3:200 mg/kg; T4:400 mg/kg; T5:800 mg/kg; T6:1600 mg/kg. No dia 30, os animais foram submetidos a exposição ao ar durante 60 segundos e devolvidos para a água. Amostras de sangue foram coletadas aos 5; 30; 60 e 360 minutos, para determinação do hematócrito, hemoglobina, contagem de células (vermelhas e brancas), contagem diferencial de leucócitos, volume corpuscular médio (VCM), hemoglobina corpuscular média (HCM) e concentração de hemoglobina corpuscular média (CHCM). Todos os animais foram pesados para calcular o ganho de peso (GP), taxa de crescimento específico (TCE) e crescimento relativo (CR). Finalmente foi determinada a sobrevivência. Os dados foram submetidos à análise de variância (ANOVA) e as médias comparadas pelo teste de Tukey (5%). Houve diferenças significativas para os parâmetros GP, TCE e CR em que T2 foi o melhor. O número de leucócitos foi significativamente maior no T5 em todos os tempos de amostragem. Houve também diferenças significativas para monócitos entre T1 e T4, T5 e T6 na primeira amostragem, enquanto para basófilos, linfócitos, neutrófilos e eosinófilos não foram observadas diferenças entre os tratamentos e os tempos. A sobrevivência foi de 100% em todos os tratamentos. Os resultados sugerem que a suplementação com vitamina C na dieta pode promover o crescimento da espécie (GP, TCE e CR), porém, níveis excessivos (1600 mg/kg) podem ter efeitos adversos sobre esse parâmetro. Por outro lado, embora houvesse diferenças significativas entre os tratamentos no número de leucócitos e na percentagem de monócitos, aparentemente tal suplementação não parece ter efeito sobre os parâmetros hematológicos avaliados, os quais em geral permaneceram constantes em condições de hipoxia aguda, independente do nível de vitamina consumida.

Palabras clave (pt)

ácido ascórbico; hipoxia; parâmetros hematológicos; parâmetros produtivos; Piaractus brachypomus

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