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The objective of this study was to evaluate the impact of supplementation levels (0, 8, 16 and 24 mg octacosanol (octa) / kg diet) on productive and physiological performance of aged Silver Montazah strain. A total number of 120 laying hens and 24 cocks of Silver Montazah local strain at 60 weeks of age was utilized in a completely randomized design and randomly assigned into 4 treatment groups (30 hens + 6 cocks in each treatment). Each group was divided into three replicates (10 hens and 2 cocks in each replicates). The 1 st group was fed the basal diet and served as the control group .The 2 nd , 3 rd and 4 th groups were fed the basal diet supplemented with 8, 16, and 24 mg octacosanol /kg diet respectively. The obtained results revealed that egg production percentage, egg mass, feed conversion ratios, concentrations of cholesterol, triglycerides, and LDL cholesterol, ovary weights, number of small yellow follicles (SYFs) and large white follicles (LWFs) were significantly (P≤0.05) improved by supplemented at levels of 16 mg or 24 mg octa /kg diet as compared with the control group. In addition, albumen height and Haugh unit were significantly (P≤0.05) improved than the control group at level of 24 mg octa /kg diet. Yolk diameter, concentrations of total protein, progesterone, estradiol, FSH, and LH, sperm cell concentration as well as sperm motility, dead spermatozoa, sperm abnormality and acrosomal

EFFECT OF OCTACOSANOL SUPPLEMENTATION ON PRODUCTIVE AND PHYSIOLOGICAL PERFORMANCE OF AGED SILVER MONTAZAH STRAIN DURING SUMMER SEASON