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The main objectives of this study was to evaluate the efficiency of crossing between two lines of rabbits under selection programs on the productive performance of cross rabbits. Three genetic groups of rabbits were used in the investigation. Alexandria line (A) as a synthetic paternal line, V line (V) as a synthetic maternal line and crossing between A line males and V line females (AV). The studied traits used to evaluate productive performance in these three genetic groups were individual body weight at weaning and at marketing age (BW4 & BW9), daily weight gain (DWG), daily feed intake (DFI), feed conversion ratio (FCR), viability rate (VR) and economic efficiency (EE). A total number of 493, 1602 and 1123 from V, A and AV rabbits, respectively were used in the investigation. The results showed that AV cross rabbits were heavier than pure line rabbits (AA and VV) for BW at two ages studied and DWG during fattening period. On other words, AV genetic group attained the marketing body weight earlier than other two groups. Also, the value of FCR improved in AV growing rabbits compared with those obtained for AA & VV rabbits. Moreover, the VR during fattening period in AV rabbits was the highest, while the lowest one was recorded in V line rabbits. It is clear apparent from these results that, AV group recorded higher values for EE than the other genetic groups. In conclusion, mating between males of the paternal line A and females of the maternal line V gave a cross that saved time and costs in order to reach marketing.

This study aimed to evaluate the effect of different forms of Zinc oxide as bulk and nano particles supplemented diet on hematological profile, antioxidant status, liver and kidney functions of Alexandria chickens. A total of 150 females and 25 males of Alexandria chickens at an age of 32 weeks were randomly divided into five groups in each group 30 female and 5 male for 12 weeks. The first group served as control group. Birds of the 2 nd and 3 rd groups were fed basal diet containing 40 and 80 mg zinc oxide (Bulk shape, ZnO) per kg diet and the 4 th and 5 th groups were fed basal diet containing 40 and 80 mg zinc oxide (Nano shape, ZnO-NPs) per kg diet, respectively. The results indicated that Hb and MCHC were significantly increased with the dose of 40 mg/kg ZnO. Data obtained revealed that there is a significant effect of zinc oxide forms on antioxidant status. While, 80 mg/kg ZnO-NPs caused a significant increase on catalase (CAT), superoxide dismutase (SOD) and total antioxidant capacity (TAC), but malondialdehyde (MDA) concentration was the lowest with the dose of 80 mg/kg ZnO-NPs. Total protein and albumin were affected by zinc oxide forms, sex and the interaction between them, but globulin was not significantly affected. Also, zinc oxide forms supplementation had no significant effect on liver and kidney functions. Generally, it can be considered that zinc oxide nanoparticles (ZnO-NPs) at a dose of 80 mg/kg addition to Alexandria chickens' diet can enhance physiological and antioxidant statuses.

The aim of the present study is to evaluate the effect of Clinoptilolite (Zeolite) addition to the broiler diets with or without phytase enzyme on blood constituents and carcass traits. Total number 594 one-day-old broiler chicks (Ross 308) were randomly divided into nine equal experimental groups with 3 replicates of 22 birds in each for 35 day of age. Birds of the 2 nd and 3 rd groups were fed diets contained 0.05% and 0.075% phytase (5000 FTU/g), the 4 th group was fed diet contained 1% Zeolite, the 5 th and 6 th groups were fed diet containing 1% Zeolite with 0.050% and 0.075% phytase (5000 FTU/g), respectively, the 7 th group was fed diet containing 2% Zeolite, the 8 th and 9 th groups were fed diet containing 2% Zeolite with 0.05% and 0.075% phytase (5000 FTU/g), respectively. While, the first group presented as basal diet without Zeolite and/or phytase supplementation. Body weight and feed conversion at 35 days of age were significantly improved by Zeolite addition and broiler chickens treated with 0.05% phytase diet had the best body weight. Blood hematology was not affected by Zeolite or phytase treatments, while serum total protein concentration was significantly increased compared with those of the control group. Also, Zeolite addition had a significant decreasing effect on broiler chicken's cholesterol and triglyceride concentrations, as well as phytase supplementation had a significant decreasing effect on broiler chicken's cholesterol, triglyceride and low density lipoprotein values. At the end of the experiment, it can be seen that carcass and dressing percentages significantly improved with Zeolite treatments. Generally, it can be considered that natural Zeolite addition to the broiler diets supplemented with or without phytase enzyme enhanced physiological status included serum protein and lipid profile.