30H-12 |
The effect of storage on egg quality from hens fed soybean soapstock |
V. PARDIO1, L. Landín, A. Flores, M. Guzmán, K. Waliszewski, A. Bringas, and F. Pérez-Gil. (1) Facultad de Medicina Veterinaria y Zootecnia, Univ. Veracruzana, Avenida Circunvalación esq. Yáñez s-n, Veracruz, 91710, Mexico The poultry egg faces economic loss due to moisture depletion and a decline in interior egg quality during extended storage. Variations in feed quality can adversely affect egg quality parameters leading to more egg breakage and problems during egg storage. The aim of the study was to determine the effect of increasing proportions of soybean soapstock in laying hen diets in egg quality parameters during storage as variations in feed can adversely affect egg quality. A 192 laying hens 20 weeks of age, were allotted to three dietary treatments replicated four times randomly with 16 birds for replicate. The diets were sorghum-meal based, isocaloric, and isonitrogenous with 100% of soybean soapstock (T4), added to reach 1.5% linoleic acid, the control diet with pigment (T5) and control diet without pigment (T6) had 100% soybean oil. Feed and water were provided ad libitum. After 6 weeks, approximately 200 fresh eggs were collected, measured within 2 h of being laid and stored at 4°C and 28°C for periods of 7, 14, 21, and 30 days. Four eggs from each temperature were randomly selected biweekly for determination of egg weight, shell thickness, Haugh unit score, albumen pH and shape index. Data were analyzed by ANOVA (P<0.05) and significant differences among treatment means by Tukey’s test using Minitab v.13.0 statistical program. Results indicated that (T4), (T5) and (T6) egg weights, shell thickness, egg shape index, stored at 4°C and 28°C were not statistically different during storage. Shell thickness increased significantly during the four weeks. Haugh unit score and albumen pH values of treatments stored at 4°C and 28°C were not statistically different. Nevertheless, Haugh unit score decreased and albumen pH increased significantly during the storage. Soybean soapstock can be recommended as a substitute of oil since no adverse effects on egg quality parameters were detected.
Session 30H, Quality Assurance
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