29B-17 |
Effect of soybean soapstock on the fatty acid composition of hen egg yolk |
V. PARDIO1, L. Landín1, L. Díaz1, P. Figueroa1, K. Waliszewski2, A. Bringas1, and F. Pérez-Gil3. (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, (3) Departamento de Nutrición Animal, Instituto Nacional de Investigaciones Biomédica y de la Nutrición Salvador Zubirán, Vasco de Quiroga 15, México D.F., 14000, Mexico Diets rich in linolenic acid have produced eggs with increased levels of n-3 fatty acids. Soapstock is a byproduct of vegetable oil refining process rich in polyunsaturated fatty acids that could be considered as a substitute of soybean or corn oil in layers diets. The aim of the study was to evaluate the effect of increasing proportions of soybean soapstock in laying hen diets on the fatty acid profile of the yolk, as variations in feed can adversely affect egg composition. A total of 192 White Leghorn laying hens, 20 wk of age, was housed in double-deck batteries, allotted to six dietary treatments with 8 birds for replicate. Diets were sorghum-meal ground based and were isocaloric and isonitrogenous. Feed and water were provided for ad libitum consumption. The diet T1 had 25%, diet T2 50%, diet T3 75% and diet T4 100% of soybean soapstock, added in the amount to reach the requirement of 1.5% linoleic acid and complemented with soybean oil, and the control diet (T5) had 100% soybean oil. The fatty acid composition, determined by GLC, was reported as a percentage. Data were analyzed by one-way ANOVA (P<0.05) and significant differences among treatment means were analyzed by Tukey’s test using Minitab 13.0 statistical program. Results indicated that the percentages of linoleic, gamma-linolenic and araquidonic acids were significantly higher in the egg yolks of hens fed with diet containing 100% of soybean soapstock. The control eggs had the significant higher n-6 fatty acids, meanwhile the T4 eggs had significant higher n-3 fatty acids. The study indicated that feeding hens up to 100% of soybean soapstock had no adverse effect on fatty acid profile of eggs. Given the important role of these fatty acids in health, soybean soapstock can be recommended as a substitute of oils in layers diets.
Session 29B, Food Chemistry: Lipids, antioxidants and emulsifiers
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