45H-5 |
Effect of soybean soapstock on the color of hen egg yolk |
V. PARDIO1, L. Landín1, A. Flores1, K. Waliszewski2, and A. Bringas1. (1) Facultad de Medicina Veterinaria y Zootecnia, Universidad Veracruzana, Avenida Circunvalación esq. Yáñez s-n, Veracruz, 91710, Mexico, (2) Unidad de Investigacion y Desarrollo en Alimentos, Instituto Tecnologico de Veracruz, M.A. de Quevedo 2779, Veracruz, 91700, Mexico In Mexico, consumers prefer bright yellow-egg yolks and as corn is used for human consumption, sorghum and yellow pigments are used in layer diets. Soapstock, a byproduct of vegetable oil refining process, is rich in pigments and could be considered as a source of egg yolk pigmentation. The aim of the study was to determine the effect of soybean soapstock on the color of egg yolk since variations in feed can adversely affect egg parameters. A 192 laying hens 20 weeks of age, were allotted to six dietary treatments replicated four times randomly with 8 birds for replicate. The diets were sorghum-meal based, isocaloric, and isonitrogenous. Feed and water were provided ad libitum. In the first experiment, diet T1 had 25%, diet T2 50%, diet T3 75% and diet T4 100% of soybean soapstock, added in the amount to reach 1.5% linoleic acid and complemented with soybean oil, the control diet with pigment (T5) and control diet without pigment (T6) had 100% soybean oil. In the second experiment Pixtafil was added to diets to equal T5-pigmentation. Four eggs from each replicate were randomly selected daily and color was analyzed with a Minolta Chroma-Meter. Data were analyzed by ANOVA (P<0.05) and significant differences among treatment means by Tukey’s test using Minitab 13.0 statistical program. Results indicated that L*, Hue, and Delta E values among treatments were not statistically different after the first experiment, nevertheless diet T1, T2, T3, T4, and T6 Chroma values were significantly lower than T5. Pixtafil was added to diets to equal T5-pigmentation. Results indicated that L*, Hue, Chroma, and Delta E values between T4 and T5 treatments were not statistically different. Soybean soapstock can be recommended as a partial substitute of pigments since no adverse effects on egg color parameters were detected.
Session 45H, International: General
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