Suplementación de dietas de gallinas de postura comercial con aceites de pescado de diferentes grados de refinación: Efectos productivos en las aves y en la calidad organoléptica de los huevos Translated title: Supplementation of commercial layer diets with different refined fish oils: Effects on layer performance and sensory egg quality

Abstract

Se evaluó el efecto sobre: porcentaje de postura (PP), consumo (CA), peso vivo (PV), peso del huevo (PH), masa de huevo (MH), conversión alimentaria (ECA), mortalidad (M), margen bruto (MB) y costo alimentario (Cali) del empleo de: harina de pescado: HP; oleina: O; aceite crudo de pescado: ACP y aceite de pescado refinado: ALKITOL-R-15®: ALK, en dietas de gallinas ponedoras comerciales. Además, se efectuó una evaluación sensorial de los huevos incluyendo: aroma, sabor, aceptabilidad y preferencia. Se utilizaron 216 gallinas Leghorn Shaver, durante 8 semanas, distribuidas en cuatro tratamientos: TI = 0% HP y aceites, T2 = 4% HP + 3% O; T3 = 4% HP + 6% ACP; T4 = 4% HP + 6% ALK. El índice de peróxidos (IP) fue de 1,5; 7,5 y 21,7 meq 0(2)/kg para O, ACP y ALK, respectivamente. La HP "prime" presentó un IP de 3,6. Las dietas mostraron porcentajes de EPA + DHA de 0,00 - 0,83 - 1,16 y 0,87, desde TI a T4, respectivamente. Los indicadores PP, CA, PV, PH, ECA y MH fueron semejantes entre T2, T3 y T4 (P > 0,05) siendo superiores, en general (P < 0,05) al TI. El T2 generó el mayor MB y el menor Cali. La evaluación sensorial de los huevos (duros y revueltos) no mostró diferencias significativas (P > 0,05) entre los tratamientos para ambas preparaciones. Se concluye que la incorporación de lípidos marinos no afecta el rendimiento productivo de las aves ni provoca efectos sensoriales adversos en los huevos y ofrecería ventajas económicas al productor

Translated abstract

The performance of 216 Leghorn layers and the sensory evaluation of their eggs were studied as a result of using different marine lipid sources (fish meal, oleine, crude fish oil and a refined fish oil, Alkitol-R-15®), in their diets. The birds were distributed randomly in 4 treatments: Tl= control, soy bean meal based diet; T2 = 4% fish meal plus 3% oleine; T3 = 4% fish meal plus 6% crude fish oil and T4 = 4% fish meal plus 6% of refined fish oil concentrate ALKITOL-R-15®. Food and water were supplied ad libitum. The evaluated variables controlled were: laying percentage (LP), food consumption (FC), live weight (LW), egg weight (EW), egg mass (EM), feed conversion efficiency (FCE), mortality (M), gross margin, feeding cost per egg produced , egg flavour and aromatic quality, egg acceptability and preference. Diets with marine oils had a higher (P < 0.05) EPA + DHA concentration than the Tl control. Main results showed that LP, LW, EW, EM, FCE and FC were similar between treatments (P > 0.05) that included marine oils irrespective of the level in which they were included. Also, all these treatments had higher performances (P < 0.05) than the control MS. The sensory evaluation indexes did not show any statistical differences (P > 0.05) between the treatments tested. The inclusion of lipids from marine resources did not affect the layer performance nor the sensory evaluation of eggs and it should produce economic benefits to the producer