ABSTRACT:One hundred and twenty Golden Montazah laying hens (Egyptian local developed strain) aged 24 weeks were divided in two groups each group contains four treatments with two different supplemental sources of zinc, inorganic zinc as zinc sulphate (ZnSo4 7H2O) and organic zinc as zinc methionine to get concentration levels 0.0, 50, 100 and 150 mg supplemental zinc/kg diet to investigate the effect of different dietary levels and sources of zinc and their interaction on the zinc concentration of egg, the productive performance, some egg quality and some blood parameters of laying hens were also estimated. The experimental period lasted for 12 weeks in three subsequent interval periods (four weeks each). Results indicated that increasing zinc levels from 0.0 up to 150 mg/kg either as inorganic or organic significantly increased egg zinc concentration without any adverse effect on egg production. The highest concentration of egg zinc was observed for layers fed diet supplemented with 150 mg zinc/ kg diet as an organic Zn (Zn methionine). Supplementing laying hens' diet with zinc as zinc methionine significantly increased egg production. In that, 100mg supplemental zinc as Zn methionine gave the best feed conversion and egg mass. Also, organic zinc supplementation significantly increased plasma zinc, total protein, albumen, and globulin and improved A/G ratio. Albumen index and Haugh unit significantly affected by increasing zinc levels.In conclusion supplemented laying hens diet with 150 mg zinc as zinc methionine / kg diet gave zinc enriched egg which could supply 19.45 % of daily requirements of zinc for children from 1-8 years and additionally gave advancement in productive performance for laying hens.

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One hundred and five Mandara laying hens, 24 wks of age, were divided into seven experimental treatments to study the effect of dietary levels of fish oil (FO), linseed oil (LO) and their combination as a source of omega 3 on egg yolk omega three polyunsaturated fatty acids concentration on cholesterol and total lipids, and the productive performance and egg quality of laying hens. The experimental treatments were divided into seven treatments with three replicates each. The first treatment group was the control group, the second treatment was given 1% FO, the third treatment was given 2% FO, the fourth treatment was given2% LO, the fifth treatment was given 3% LO, the sixth treatment was given 1% FO + 1% LO and the seventh treatment was given1.5% FO + 1.5% LO. The obtained data revealed the following results: Addition of FO, LO, and LO + FO to the diets did not cause significant effects (P > 0.05) on feed intake, feed conversion and egg production traits (egg number, egg weight and egg mass). Adding FO, LO, and their combination insignificantly increased yolk percentage. Saturated fatty acids significantly decreased FO and LO increased compared to the control. Diets containing FO, LO, and their combinations resulted in a significant increase of n-3 polyunsaturated fatty acids and polyunsaturated fatty acid concentrations in eggs compared to the control group. Adding 2% FO, 1% FO + 1% LO and 1.5% FO + 1.5% LO to laying diets decreased (P<0.05) egg yolk total cholesterol and egg yolk total lipids comparing to control group. The lowest values of egg yolk total cholesterol and egg yolk total lipids were recorded by 1.5% FO + 1.5% LO compared to other treatments. Using 1% FO only or 1% FO + 1% LO in laying hen diets improved the economical efficiency comparable to the control group. The best feed cost/kg egg was recorded by the group fed diet 1% FO + 1% LO.

n experiment was conducted for a period of 9 wks. to investigate the effect of adding some antioxidants to diet contain fatty acids on growth performance, some physiological and hematological parameters as well as evaluating the carcass characteristics of Silver Montazah male chicks. For this purpose 315 five-weeks old Silver Montazah (SM) males were used up to 14 wks. of age. All chicks were randomly divided into seven equal groups (45 chicks, each) with three replicates (15 chicks each). Chicks were wing banded and individually weighed, with nearly similar average initial live body weight of all groups. The 1 st group was fed the basal diet that contained Linoleic acid (n-6) and Linolenic acid (n-3) at the ratio of 4:1, respectively and served as control. The 2 nd and 3 rd groups were fed the basal control diet supplemented with 125 and 250g Butylated Hydroxy Toluene/Ton diet, respectively. The 4 th and 5 th groups were fed the basal control diet supplemented with 100 and 200g vit. E /Ton diet, respectively. The 6 th and 7 th groups were fed the basal control diet supplemented with 5 and 10kg citric acid /Ton diet, respectively. Results indicated that dietary antioxidants supplementation especially citric acid at the two studied levels and vit. E (200 g/Ton) significantly (P≤0.01) increased live body weight at 9 and 14 wks. of age, body weight gain during the periods of 5-9 and 5-14 wks. of age, and improved feed conversion ratio during the periods of 5-9 and 5-14 wks of age compared to the control group. Moreover, significant increases were obtained for red blood cells (RBC's) and plasma total protein and globulin concentrations for groups fed diet supplemented with antioxidants compared with the control group. Conversely, significant lower heterophils/ lymphocytes ratio and plasma concentration of total lipid, cholesterol and triglycerides were associated with supplemental antioxidants. Relative weights of liver and spleen of SM males were increased with antioxidants supplementation. In conclusion, for attaining the goal of economic improvement of meat production from local strain of chicken (SM) in Egypt. Dietary supplemental of antioxidants to feed containing fatty acids is practical application especially by 5 and 10kg citric acid and 200g vit. E /Ton diet to SM male chicks, could promoted the growth performance and had beneficial effects on some physiological and hematological parameters, as well as adjusted the carcass characteristics and immune status.