The Importance of Maternal Antioxidants for Embryo Development in Birds

Abstract

Egg yolk is source of maternal effect in birds, and antioxidants are transferred to egg yolk from maternal plasma during yolk development. In fact, maternal antioxidant system affects antioxidant level of the egg yolk. Antioxidants, are not synthesized in the organism in birds, are taken into the body through feed. Therefore, maternal's consumed feed and feed components influence the yolk antioxidant level and antioxidant/pro-oxidant balance in the embryo tissue. Maternal antioxidants in yolk are lipidsoluble antioxidants (vit-A, vit-E and carotenoids) and phosvitin which is in the protein granules of yolk. Maternal antioxidants have the main role on embryo development and prevention of oxidative stress. Egg yolk contains high level of fat and polyunsaturated fatty acids (PUFA) to provide energy and normal development of the embryo. Lipid peroxidation (LPO) via this high level of fat and PUFA can lead to damage in embryo tissues. For that reason, embryo tissues need to contain effective antioxidants which protect to embryo against LPO. Natural antioxidant resources in embryo tissues are not sufficient to protect the embryo which is under risk due to the increase LPO and PUFA and use of oxygen in embryo tissues on the day 19th of embryo development. Maternal antioxidants are also important in reducing the harmful effects of free radicals on the efficiency of the immune system,because newly hatched chick's immune system is not functional. In addition, maternal antioxidants protect newly hatched chick against reactive oxygen species (ROS). The purpose of this review was to evaluate the importance of maternal antioxidants in egg yolk during embryo development.

Keywords

• Embryo development, Maternal effect, Yolk antioxidants

Kanatlılarda Maternal Antioksidanların Embriyo Gelişimi İçin Önemi

Abstract

Kanatlılarda maternal (dişi ebeveyn) etkilerin kaynağı yumurta sarısı olup, sarı gelişimi boyunca antioksidanlar yumurtlayan dişi ebeveynin plazmasından sarıya aktarılır. Bu nedenle, dişi ebeveynin antioksidan sistemi, yumurta sarısının antioksidan düzeyini etkiler. Kanatlılarda antioksidanlar organizmada sentezlenmediğinden yem aracılığı ile vücuda alınırlar. Nitekim, dişi ebeveynin tükettiği yem ve yem komponentleri, sarı antioksidan düzeyini ve embriyo dokularındaki antioksidan/pro-oksidan dengeyi etkilemektedir. Sarıdaki maternal kökenli antioksidanlar yağda çözünen (vit-A, vit-E ve karotenoidler) ile sarının protein granüllerinde oluşan fosvitindir. Maternal antioksidanlar, oksidatif stresin önlenmesi ve embriyo gelişimi üzerinde temel role sahiptirler. Yumurta sarısı, embriyonun normal gelişimini sağlamak ve enerji ihtiyacını karşılamak için yüksek düzeyde yağ ve doymamış yağ asitleri (PUFA) içerir. Sarıdaki yüksek yağ ve PUFA düzeyleri lipid peroksidasyona (LPO) yol açarak embriyo dokularına zarar verebilir. Dolayısıyla, embriyoyu LPO’dan korumak için, embriyo dokularında etkili antioksidanların bulunması gerekir. Embriyo gelişiminin 19. gününde embriyo dokularında PUFA, LPO ve oksijen kullanımı arttığından, dokularda doğal antioksidan depoları embriyoyu korumak için yeterli düzeyde olmayıp, bu dönem embriyo için risklidir. Çıkışta civcivin immun sistemi fonksiyonel olmadığından, maternal antioksidanlar immun sistem etkinliği üzerindeki serbest radikallerin zararlı etkilerini azaltma açısından da oldukça önemlidir. Ayrıca, maternal antioksidanlar çıkıştan sonra civcivi reaktif oksijen türlerine (ROS) karşı korur. Bu derlemenin amacı, kanatlılarda yumurta sarısındaki maternal antioksidanlar ile bunların embriyo gelişimi açısından önemini irdelemektir.

Keywords

• Embriyo gelişimi, Maternal etki, Sarıdaki antioksidanlar

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