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Articles by Ashraf M.A.S. Goda
Total Records ( 2 ) for Ashraf M.A.S. Goda
  M.A. Kabir Chowdhury , Ashraf M.A.S. Goda , Ehab R. El-Haroun , Mohamed A. Wafa and Shady A. Salah El-Din
  A growth trial was conducted to investigate the effect of different dietary protein and feeding times on growth performance and feed utilization of freshwater prawn Macrobrachium rosenbergii Post-Larvae (PL). The experiment was conducted in outdoor concrete pens (6 m-3) for 84 days. Post-larvae with an average weight of 20.8±0.17 mg were stocking at 30 PL m-3 in each pens. Two isocaloric (~15.0 MJ DE kg-1) test diets were formulated to contain two different dietary protein 35 and 40%. The daily feeding level was divided into equal two amounts and fed twice a day at three different feeding times (9:00; 12:00 h); (9:00; 15:00 h) and (9:00; 18:00 h). The highest survival rate, weight gain and specific growth rate (p≤0.05) were observed for PL fed diet with 35% CP. The same trend was observed for PL fed with feeding time 9:00, 15:00 h. The PL fed diet containing 35% protein showed the highest (p≤0.05) protein efficiency ratio, protein productive value, fat retention, energy retention and the better feed conversion ratio. Meanwhile, the PL fed at feeding time 9:00, 18:00 h recorded the better feed conversion ratio. No significant difference was showed for the effect of dietary protein on whole body moisture and protein contents. The highest whole body contents of crude fat and gross energy were observed for prawn fed the diet with 35% CP. However, PL fed at 9:00, 15:00 h had the highest whole body protein and lower fat contents (p≤0.05). Irrespective of dietary proteins or feeding times, M. rosenbergii male recorded the better growth performance and feed utilization than female in all scenarios. The obtained findings revealed that M. rosenbergii PL fed the diet containing 35% CP at feeding time 9:00; 15:00 h is recommended to obtain optimum growth performance and feed utilization.
  Ashraf M.A.S. Goda
  Two feeding trails were conducted with Nile tilapia Oreochromis niloticus fingerlings to determine the effect of dietary phytase level with partial or complete replacement of fish meal (FM) by soybean meal (SBM) on growth, feed utilization, nutrients digestibility as well as dietary phosphorus discharge. A total of 960 Nile tilapia fingerlings with an average body weight of 18.8±0.3 g were divided in the twenty-experimental treatments (duplicate for each treatment). The experiment was conducted for 13 week. Five basal diets were formulated to be isonitrogenous 30% crude protein and isocaloric 19.5 MJ kg-1 diet gross energy. The control diet (diet 1) was prepared with FM as the main protein source. Diets 2-5 each SBM were substituted, for an isonitrogenous amount of FM control diet, to provide 25% (diet 2), 50% (diet 3), 75% (diet 4) or 100% (diet 5) of the FM crude protein. Another three groups of similar previous five basal diets were formulated and supplemented with 1000, 1500, 2000 FTU kg-1 diet, respectively of phytase enzyme. The present results suggest that a 25% substitution of dietary FM with SBM in Nile tilapia fingerlings diets has enhance growth performance and feed efficiency. With increasing dietary SBM levels; comparably lower growth indices were obtained compared to 100%-FM control diet. Irrespective of dietary SBM levels, supplementation of microbial phytase at 1000 FTU kg-1 level has demonstrated to be efficient for increasing dietary phosphorus supply for Nile tilapia fingerlings, thereby reducing the phosphorus effluent from aquaculture facilities. This may have to be taken into consideration for ongoing feeding strategies for the control of waste discharge.
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