الفهرس 
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Abstract
The experimental work of the present study was carried out at the Animal Production Unit, Experimental Research Center, Faculty of Agriculture Mansoura University and Laboratory of Animal Production Department. This study aimed to investigate the possibility of using bread wastes which produce from University Student Restaurants in big amounts daily and considered as wastes. To investigate the effect of partially or totally substitution of replacing mixture (RM) instead of concentrate feed mixture (CFM) in the diet of growing lambs. The RM consisted of bread wastes (BW) and soybean meal (SBM) at 5:1 (wt/wt) ratio. Twenty- eight Rahmani crossbred lambs (Romanov x Rahmani) including 12 males and 16 females were divided to four groups having nearly similar average of live weight, each of seven animals (3 males and 4 females). At the end of the experiment, four digestion trials were carried out using three males from each group. Chemical analysis of feed ingredients and • experimental diets, nutrients digestibility coefficients, feeding value of tested diets, rumen liquor parameters, growth performance, feeding cost and economical efficiency as well as blood constituents were studied. The experimental period lasted about 8 months. Four experimental diets were used taking in the consideration the concentrate: roughage ratio 60:40 as follows: Diet No.l (C): 40% clover hay (CH) and 60% CFM. Diet No.2 (T1): 40% CH+ 30% CFM+ 25% BW+ 5% SBM. Diet No.3 (T2): 40% CH+ 15% CFM+ 37.5% BW+ 7.5% SBM. Diet No.4 (T3): 40% CH+ 50% BW+ 10% SBM.