الفهرس 
1. INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This study was conducted at the Experimental Station and Nutrition Laboratory, Animal Production Department, Faculty of Agriculture, Minoufiya University (Shebin El-Kom) in order to investigate the effect of some factors affecting nitrogen metabolism in sheep (protein source, protein level, energy source and energy level) on nutrient digestibility, nutritive values, nitrogen balance, ruminal microbial activity, plasma parameters, hormones measurements and plsma amino acids metabolism in three metabolism experiments as follow. This experiment was conducted to study the effect of protein source and level on nitrogen metabolism using eight Rahmani rams (average live body weight of 30 Kg) in two 4X4 Latin square design and fed eour ration i.e., ration (1) soybean meal (SBM) 10% CP, ration (2) SBM 14% CP, ration (3) ctton seed meal (CSM) 10% CP and ration (4) CSM 14% CP.