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    Comparison of the effects of dietary supplementation of flavonoids on laying hen performance, egg quality and egg nutrient profile
    (Taylor & Francis Inc, 2017) Yenice, Güler; Kaynar, Özgür; Hayırlı, Armağan; Kaya, Adem
    1. The aim of this experiment was to compare the effects of dietary supplementation of hesperidin, naringin and quercetin on laying hen performance, egg quality and egg yolk lipid and protein profiles.2. A total of 96 Lohmann White laying hens weighing an average of 1500g at 28weeks of age were randomly assigned to a basal diet and the basal diet supplemented (0.5g/kg) with either hesperidin, naringin or quercetin. Each treatment was replicated in 6 cages in an 8-week experimental period. Data were analysed using one-way analysis of variance.3. None of the dietary flavonoids affected laying performance and eggshell quality. Hesperidin and quercetin supplementations decreased albumen and yolk indexes.4. As compared to the control group, egg yolk cholesterol content decreased and egg yolk protein content increased in response to dietary hesperidin and quercetin supplementation. The mean egg yolk cholesterol (mg/g) and protein (g/100g) contents were 10.08/14.28, 16.12/14.08, 14.75/15.04 and 15.15/14.85 for the control group and groups supplemented with naringin, hesperidin and quercetin, respectively.5. Egg yolk lipid and protein profiles were variable.6. In conclusion, dietary supplementation of hesperidin or quercetin could be used in the diets during the early laying period to reduce egg yolk cholesterol and increase egg yolk protein, which may be attractive to consumers.
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    Dietary bromelain supplementation for improving laying performance, egg quality and antioxidant status
    (Eugen Ulmer GMBH CO, 2019) Yenice, Güler; İskender, Hatice; Dokumacıoğlu, Eda; Kaynar, Özgür; Kaya, Adem; Sezmiş, Gürkan
    Ziel der Studie war es, die Auswirkung einer Nahrungsergänzung durch Bromelain auf die Legeleistung, die Eiqualität, Serumparameter und den antioxidativen Status zu untersuchen. Insgesamt 96 Hennen der Linie Lohmann White Leghorn (Alter 28 Wochen) wurden während eines 8-wöchigen Versuchszeitraums mit Futtermitteln gefüttert, die unterschiedliche Mengen an Bromelain (0, 0,15, 0,30 und 0,45 g/kg) enthielten. Jeder Versuch wurde mit 6 Wiederholungen durchgeführt. Die Daten wurden nach dem GLM-Verfahren analysiert, einschließlich orthogonaler (Kontrolle vs. Bromelain) und polynomaler (Dosis-Wirkungs-Verhältnis) Kontrastanalysen. Eine Nahrungsergänzung mit Bromelain hatte keinen Einfluss auf die Legeleistung und die Eiqualitätsparameter. Bromelain-Supplementierung erhöhte die Proteinkonzentration im Eigelb (P < 0,0001) und im Serum (P < 0,04), und verminderte den Triacylglycerolanteil im Eigelb (P < 0,0001) und die Cholesterinkonzentration im Serum (P < 0,0003), hatte aber keinen Einfluss auf den Cholesterinanteil im Eigelb. Im Serum der Hennen, die mit Bromelain-ergänztem Futter gefüttert wurden, wurden mehr antioxidative Enzyme (265 vs. 210 U/g Protein für Superoxiddismutase; 16,31 vs. 7,95 U/g Hb für Glutathionperoxidase und 4.70 vs. 2,33 U/g Hb für Glutathion-STransferase; P < 0,0001) und weniger Malondialdehyd (114 vs. 86 nmol/ml, P < 0,05) nachgewiesen als bei Hennen, die das Kontrollfuttermittel erhielten. Es kann geschlussfolgert werden, dass zur Verbesserung der antioxidativen Kapazität eine Nahrungsergänzung mit Bromelain bis zu 0,45 g/kg im Legehennenfutter möglich ist.
  • Küçük Resim
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    The effects of dietary flavonoid supplementation on the antioxidant status of laying hens
    (FACTA-FUNDACIO ARNCO CIENCIA TECNOLOGIA AVICOLAS, 2016) İskender, Hatice; Yenice, Güler; Dokumacıoğlu, Eda; Kaynar, Oezguer; Hayırlı, Armağan; Kaya, Adem
    Ninety-six 28-week-old Lohmann White laying hens were utilized to test the antioxidant effects of flavonoids (hesperidin, naringin, and quercetin at 0.5 g/kg diet) during an 8-wk experimental period. At the end of the experiment blood samples were collected to determine total protein, cholesterol, and malondialdehyde (MDA) serum levels as well as activities of glutathione reductase (GR), glutathione peroxidase (GSH-Px), glutathione-S-transferase (GST), and superoxide dismutase (SOD) and level of glutathione (GSH) in erythrocyte lysates. Data were analyzed using one-way ANOVA. Naringin supplementation did not alter serum cholesterol concentration, whereas hesperidin and quercetin supplementations decreased serum cholesterol concentration. Naringin and quercetin supplementations did not affect serum protein concentration. All flavonoids decreased MDA concentration as well as increased GSH-Px, GR, GST, and SOD activities and GSH level, being quercetion superior to hesperidin and naringin. In conclusion, flavonoids, especially quercetin, exert antioxidant activity, which may help improve wellbeing when laying hens are exposed to stressors.