EFECTO DE LA INCLUSIÓN DE DIFERENTES FUENTES DE LÍPIDOS SOBRE PARÁMETROS PRODUCTIVOS Y COMPOSICIÓN PROXIMAL DEL FILETE DE TILAPIA NILÓTICA -Oreochromis niloticus- CULTIVADA EN JAULAS FLOTANTES / EFFECT OF THE INCLUSION OF DIFFERENT LIPID SOURCES ON GROWTH PERFORMANCE AND PROXIMATE COMPOSITION OF NILE TILAPIA FILLET -Oreochromis niloticus- REARED IN FLOATING CAGES

RESUMEN

Para evaluar el efecto de la inclusión de diferentes fuentes de lípidos sobre el comportamiento productivo y la composición proximal del filete de tilapia nilótica Oreo-chromis niloticus, se formularon cuatro dietas con aceite de pescado (AP), aceite de palma (APL), semilla de chía (SC) o semilla de lino (SL). El experimento fue realizado durante 45 días en la represa de Betania (Huila, Colombia), en 20 jaulas flotantes, cada una con 504 peces con peso promedio de 557±16,87 g, distribuidos bajo un diseño experimental completamente al azar. Adicionalmente se llevó a cabo un estudio de presupuestos parciales, con el fin de verificar el margen bruto de ingreso parcial (MBIP) obtenido con las diferentes dietas. Se observaron diferencias significativas (P < 0,05) en el factor de conversión alimenticia (FCA) entre AP (1,19) y SL (1,54) y en la tasa de eficiencia proteica (TEP) para AP (3,64) al comparar con las demás dietas. Por su parte, la dieta que contenía SC generó el menor MBIP, seguido de SL, APL y AP. En la composición proximal de los filetes, únicamente se observaron diferencias significativas (P < 0,05) en el contenido de proteína cruda entre AP (18,23%) al compararlo con SL (19,17%). En conclusión, es posible utilizar AP, APL, SC o SL como fuentes de lípidos en las dietas, sin afectar la sobrevivencia, biomasa final, ganancia diaria de peso, consumo aparente de alimento, tasa específica de crecimiento e índice viscerosomático.

ABSTRACT

In order to evaluate the effect of inclusion of different lipid sources on growth performance and proximate composition of Nile tilapia Oreochromis niloticus fillet, four diets were manufactured with: fish oil (FO), palm oil (PO), chia seeds (CS) or flaxseeds (FS). The experiment was conducted for 45 days at Betania reservoir (Huila), in 20 floating completely randomized experimental design. In Addition, an economical partial budget analysis was run to establish the partial gross marginal income (PGMI) obtained with the different diets. Significant differences (P < 0,05) were observed in feed conversion ratio (FCR) between FO (1,19) and FS (1,54) and protein efficiency ratio (PER) among FO (3,64) and the other diets. The CS diet generated the lower IGMP followed by FS, PO and FO. In fillet proximal composition there were significant differences (P < 0,05) only in crude protein content, between FO (18,23%) compared with FS (19,17%). In conclusion it is possible to use FO, PO, CS or FS as lipids sources in the diet without affecting survival, final biomass, daily live weight gain, apparent food intake, specific growth rate and viscerosomatic index. cages, each one with 504 fish with mean live weight of 557 ± 16,87 g, distributed in a completely randomized experimental design. In Addition, an economical partial budget analysis was run to establish the partial gross marginal income (PGMI) obtained with the different diets. Significant differences (P < 0,05) were observed in feed conversion ratio (FCR) between FO (1,19) and FS (1,54) and protein efficiency ratio (PER) among FO (3,64) and the other diets. The CS diet generated the lower IGMP followed by FS, PO and FO. In fillet proximal composition there were significant differences (P < 0,05) only in crude protein content, between FO (18,23%) compared with FS (19,17%). In conclusion it is possible to use FO, PO, CS or FS as lipids sources in the diet without affecting survival, final biomass, daily live weight gain, apparent food intake, specific growth rate and viscerosomatic index.