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      Efecto de la restricción de alimento y posterior realimentación sobre algunas variables fisiológicas y metabólicas en yamú (Brycon amazonicus) Translated title: Effects of food restriction and refeeding on some physiological and metabolic variables of yamú (Brycon amazonicus)

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          RESUMEN Se evaluó el efecto de la restricción de alimento y posterior realimentación sobre algunas variables fisiológicas en yamú (Brycon amazonicus) utilizando 1115 juveniles (peso inicial 217,75 g ± 14,74 g) distribuidos en tres estanques y asignados a los siguientes tratamientos: 1) Control (C), alimentación todos los días; 2) Restricción moderada (RM), restricción por 2 días y realimentación por 3 y 3) Restricción severa (RS), restricción total durante 5 semanas y realimentación a partir de la semana 6 hasta la 12. Se realizaron colectas de sangre los días 1, 35, 42, 56, 70 y 84, de 7 animales por tratamiento para determinación del hematocrito, proteína, glucosa, lactato, triglicéridos, colesterol, cortisol, T3 e insulina. Adicionalmente, los animales se sacrificaron para retirar el hígado y determinar el glucógeno hepático. El modelo experimental fue mixto de efectos fijos, con 3 tratamientos y 6 muestreos, con anidamiento del muestreo en los tratamientos. Los datos se analizaron a través de análisis de varianza y en los casos en que hubo diferencias significativas se empleó la prueba de Tukey-Kramer. No hubo diferencias significativas (p > 0,05) para hematocrito, proteína, glucosa, cortisol y lactato entre los tratamientos en ninguna de las muestras tomadas. La insulina y T3 mostraron diferencias entre tratamientos en el día 35, pero no en el 84, igual a lo ocurrido con colesterol y glucógeno hepático. Los triglicéridos mostraron diferencias a lo largo del estudio, en el día 84 RS presentó menores niveles. Los resultados permiten concluir que pese a la restricción parcial de alimento, no se generaron efectos negativos sobre el metabolismo de Brycon amazonicus.

          Translated abstract

          ABSTRACT The effect of food restriction and refeeding on some physiological variables in yamú (Brycon amazonicus) was evaluated using 1115 juveniles (initial weight 217.75 g ± 14.74 g), distributed in three ponds. The groups were randomly assigned one of the following treatments: 1) Control (C), fed every day; 2) Moderate restriction (MR), restriction during 2 days and refeeding during 3; and 3) Severe restriction (SR), total restriction during 5 weeks and refeeding from week 6 to 12. Blood samples from 7 animals from each treatment were taken on days 1, 35, 42, 56, 70, and 84 to determine hematocrit, proteins, glucose, lactate, triglycerides, cholesterol, cortisol, T3, and insulin. The animals were sacrificed and their livers removed to calculate the hepatic glycogen. The experimental design used was a fixed effects mixed model of 3 treatments and 6 samples, with sampling nesting in the treatments. A variance analysis was performed to analyze the data; the Tukey-Kramer test a variance analysis was used in the cases with significant differences. No significant differences (p> 0.05) were found for hematocrit, protein, glucose, cortisol, and lactate. The insulin and T3 showed differences among treatments on day 35, but not on day 84, the same as cholesterol and hepatic glycogen. Triglycerides showed differences throughout the study, SR showed the lowest levels on day 84. The results allow us to conclude that, despite the partial feed restriction, there were no adverse effects on the metabolism of Brycon amazonicus.

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          Most cited references 30

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              Most fish are indeterminate growers with white muscle making up the majority of the acquired bulk. Within the muscle, the myofibrillar fraction accounts for almost two-thirds of the protein synthetic activity, implying that it is accretion of myofibrillar proteins that makes the single most important contribution to fish growth. Fish muscle growth itself is not linear and occurs through a combination of hyperplasia and hypertrophy in post-juvenile stages. Superimposed on periodicity of growth in length and mass can be other phases governed by lunar, reproductive or circannual cycles. Data on fish growth are discussed in the framework of site-specific muscle abundance, metabolic and functional zonation of muscle, proliferation and differentiation of satellite cells and the contribution of myofibrillar proteins. Hormonal control of muscle growth is described against the backdrop of plasma availability of myogens (insulin, IGF-I, growth hormone), distribution and dynamics of their respective receptors, and their interactions. Important contributions of the 'supply side' are discussed with hormones regulating amino acid resorption from the intestine, intestinal growth, liver processing and amino acid uptake by the muscle. Data are also interpreted from metabolic angles, to explain lipolytic and nitrogen-sparing effects of growth hormones, and lipogenic effects of insulin and high protein diets. Finally, special attention is devoted to the multifaceted roles of arginine in fish growth, as precursor, intermediate and hormone secretagogue.

                Author and article information

                Role: ND
                Role: ND
                Revista de la Facultad de Medicina Veterinaria y de Zootecnia
                Rev. Med. Vet. Zoot.
                Facultad de Medicina Veterinaria y de Zootecnia Universidad Nacional de Colombia (Bogotá, Distrito Capital, Colombia )
                August 2018
                : 65
                : 2
                : 154-171
                Bogotá orgnameUniversidad Nacional de Colombia orgdiv1Facultad de Medicina Veterinaria y de Zootecnia orgdiv2Departamento de Producción Animal Colombia

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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