الفهرس 
مركزات أوراق الكرنب كمصدر جديد للبروتين فى أعلاف البلطى النيلىOnly 14 pages are availabe for public view
 |  | from | 54 |  |  |
| | | from | 54 | | |
Abstract
Two feeding trials were conducted to evaluate the effects of partial replacement of soybean meal protein and fish meal protein by cabbage leaves concentrate meal (CLCM) protein in diets of Nile tilapia (Oreochromis niloticus). The first experiment was lasted for 12 weeks whereas the second was lasted for 13 weeks. In the first experiment, 7 diets were formulated whereas diet 1 (control) and protein of soybean meal was replaced by protein of CLCM at 5% (diet 2), 10% (diet3), 15% (diet 4), 20% (diet 5), 25% (diet 6) and 30% (diet 7). Each diet was fed to duplicate aquaria (10 fish each) with an average weight of 1.51g. Nile tilapia fed the first four diets obtained the highest body weights and specific growth rates and the lowest values were obtained by fish fed diets 6 and 7. No significant differences in FCR and PER of fish fed the experimental diets. No significant differences in condition factors and survival rates of fish fed the dietary treatments. Fish fed diets 1, 4 and 5 obtained the best apparent net protein utilization. No significant differences in body composition data on wet weight basis for fish fed the experimental diets. Also, no significant differences in plasma total protein, plasma albumin, plasma globulin and plasma glucose. Economically the best profit index was obtained by fish fed diet 4 where 15% of soybean meal protein was replaced by CLCM protein. In experiment two, 7 diets were prepared. The protein of fish meal was replaced by CLCM protein at 0, 2.5, 5, 7.5, 10, 12.5 and 15% (diets 1, 2, 3, 4, 5, 6 and 7 respectively). Each diet was fed to duplicate randomly assigned aquaria for 13 weeks. Each aquarium was stocked with 10 fish with average weight of 1.60 g. The results were as follows: Nile tilapia fed diets 1, 2, 3, 4 and 5 obtained the best growth performance (body weight and SGR). No significant differences in FCR, PER and ANPU for fish fed the experimental diets. No significant differences in body condition factors and survival rates for fish fed the experimental diets. No significant differences in carcass ash and crude protein but significant differences were recorded in moisture and crude lipids of fish fed the experimental diets. No significant differences in HSI, GI and plasma albumin whereas significant differences in plasma total protein, plasma globulin and plasma glucose in fish fed the experimental diets. The best profit index (1.65) was obtained by fish fed diet 5 where 10% of fish meal protein was replaced by CLCM protein.