One hundred and eighty (180), 28 weeks old Gimmizah laying hens were used in the experiment. Hens were distributed at random into 6 treatment groups and divided into 3 replicates of 10 layers each in a completely randomized design. The experiment was performed at a private farm in, Tanta, Gharbia a Governorate, Egypt. The objective of this investigation was to study the effect of some feed additives as oxidized palm oil and different levels of probiotic supplementation on the performance of Gimmizah laying hens, Egg quality traits, some blood parameters, blood lipid profile and economic efficiency under our local environmental conditions. hens was fed dietary treatments as: T1, basal diet (positive control, without supplementation), T2 (negative control, 2% oxidized palm oil) and other diets (T3 at T6) were supplemented with two types of probiotics as 0.5% and 1% of saccharomyces cervices and Aspergillus awamori.
Results showed that; Hen-day egg production percentage, egg weight, egg number and egg mass were improved by probiotics supplementation at the level of 1% Aspergillus awamori with 2% oxidized palm oil. Also, Feed conversion was significantly (P ≤0.05) improved, while feed intake increased for groups received probiotics with oxidized palm oil at all levels used compared to negative control. While, pronounced effects on egg sell (weight, percentage and thickness) were significantly noted. Albumen and yolk qualities and Hough units were improved by adding received probiotics of yeast and Aspergillus awamori with 2% oxidized palm oil at the level 1% laying hen diets. Plasma total lipid and cholesterol were significantly (P < 0.05) decreased by adding dietary yeast and Aspergillus with oxidized palm oil to laying diets. Oxidized palm oil and probiotic supplementation to basal layer diet increased economic efficiency and relative economic efficiency; best values were obtained with 1% Aspergillus awamori with 2% oxidized palm oil. In general, based on obtained experimental results reported herein, from the nutritional and economical point of view, it may be concluded that there are some beneficial effects of oxidized palm oil and probiotics as yeast and Aspergillus awamori supplementation, especially at the level of 1% of Gimmizah hens under the experimental condition.