الفهرس 
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Abstract
The main objectives of this work were The present study was conducted at the EI-Serw Experimental Research
Station, Animal Production Research Institute, Agricultural Research Center
and Animal Production Department, Faculty of Agricultural, Mansoura
University.The present study was conducted at the EI-Serw Experimental Research
Station, Animal Production Research Institute, Agricultural Research Center
and Animal Production Department, Faculty of Agricultural, Mansoura
University.to investigate the effects of partial replacement of ration crude protein (0, 15, 30, 45 and 60 %) by urea (0, 0.8, 1.6, 2.4 and 3.2%, respectively) in rations supplemented with or without bentonite clay by Rahmani sheep on digestion coefficients and nutritive values of tested rations. Some rumen parameters and blood constituents were also studied. Twenty seven Rahmani rams, selected from ElSerw Station Herds, with an average of 36 months of age and weighing an average of 55.40 kg were used. Animals were randomly divided into 9 equal groups (3 rams each) according to their live body weight. Each digestibility trial lasted for 42 days, of which 35 days considered as preliminary period for adapting the animals to the tested rations, then followed by 7 days as collection period and finally one day for blood and rumen fluid sampling. Generally, it could be concluded that, ureaprotein could be economically replace 60% of total crude protein requirements of Rahmani rams (with addition 3% bentonite) without adverse effect of digestion coefficients, nutritive values and rumen parameters as well as blood constituents or animal health. However, the results obtained herein open the field for further research work using long term feeding trial with growing or dairy animals.