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As the events during critical development periods may influence long-term or life-time structure and function of the body (Angelbeck and Du Bru 1983; Lucasand others 1990, 1996; Snoeck and others 1990; Desaiand others 1995, 1996), the impact of breeders nutrition on nutritional status of off springs has received considerable attention. Selenium (Se) and methionine (Met) are 2 essential substances for poultry nutrition. Se is an essential component of a variety of selenoproteins, the best known of which is glutathione peroxidase (GSH-Px). The GSH-Px family of enzymes is a crucial player in the integrated antioxidant system, neutralizing potential threats to the integrity of cellular macromolecules by eliminating hydrogen peroxide and detoxifying lipid hydro peroxides (BrigeliusFlohe1999). Se derived from the diet of the female bird is deposited in the egg and is distributed among the developing tissues during embryo genesis (Ga alandothers1995; Surai2000; Paton and others2002). Consequently, GSH-Px is expressed in the chicken embryo in a tissue and stage-specific manner(Wilson and others1992; Ga aland others1995; Surai1999). Supplementary Se in the diet of the hen was shown to increase the concentration of this element in the egg and in the tissues of the chick at hatch, and to elevate the expression of GSH-Px, while reducing the generation of lipid peroxides in the liver of the day-old chick(Surai2000; Paton and others2002). Pappas and others(2005) have shown that dietary supplementation of the female chicken with Se increased Se concentrations and GSH-Px activity in blood, liver, and breast of chicks for 2 to 4 wk post hatch. Surai(2000) also revealed that the effects of maternal Se supplementation remained significantly after10 d of hatching. Methionine is considered to be the 1st limiting factor in classical diets used for growing chickens that plays unique roles, both in protein structure and in metabolism (Baker 2006). Methionine, an essential dietary amino acid, is used to synthesize proteins and other amino acids. Cysteine and homocysteine are produced during Met metabolism. In most cells,

Effect of Maternal Selenium and Methionine on Poultry Products (Egg and Meat) Qualities and Oxidative Stability