EFFECT OF REPLACING FISH MEAL AND SOYBEAN MEAL BY SWEET LUPIN SUPPLEMENTED WITH METHIONINE IN DIETS ON THE PRODUVTIVE PERFORMANCE OF BLUE TILAPIA FISH (Oreochromis aureus) | ||||
| Journal of Animal and Poultry Production | ||||
| Article 6, Volume 28, Issue 10, October 2003, Page 7197-7207 PDF (3.29 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2003.245286 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| M. F. Osman, | ||||
| Department of Animal Production, Branch of Fish Production, Faculty of Agriculture, Ain Shams University | ||||
| Abstract | ||||
| In an experiment carried out in the fish wet lab of the Faculty of Agriculture, Ain Shams University. 360 fish fingerlings (Oreochromis aureus) with an average initial weight of 3g! fish were used. The fish were randomly distributed in 18 twenty liter fiberglass tanks (20 fish each). The tanks were a part of closed system provided with biological and mechanical filters to keep constant water quality in all tanks. Water temperature was kept constant at 27" C throughout the experimental period (8 weeks) by an electrical thermo regulated heaters (4kW). Six experimental diets were formulated to contain 31% crude protein and 4150 cal gross energy! kg, where diet 1 (control) contains fish meal and soy bean meal as a main sources of protein in the diet. In the second diet, soybean meal protein was replaced by sweet lupin protein to test the effect of replacing soybean meal by sweet lupin. and diets 3. 4. 5 and 6 were designed to include only plant protein sources (soybean meal and sweet lupin) supplemented with 0, 0.3, 0.6 or 0.9 % DL-methionine, respectively. Each diet was fed daily to 3 tanks at a rate of 7% of fish body weight daily. During the experimental period. fish were weighed every 7 days to. adjust feed amount. A sample of fish fingerlings at the beginning of the experiment and the all fish at the end were chemically analyzed to determine the differences in body composition. The results showed that fish groups fed diets containing both animal and plant proteins (diet 1 and 2) had the highest significant weight gain (P<0.05). When animal protein was replaced by plant protein without methionine supplementation (group 3) fish final weight decreased to less than 50% of the control group. With adding DL-methionine the growth performance parameter values (weight gain, SGR. feedl gain. PER, PPV and the energy utilization) started to increase. Final body protein was not significantly (P>0.05) affected by the type of protein used in diets. Body fat content was decreased when sweet lupin was incorporated in diets. Ash did not indicate any changes when protein source in the diets was changed. It seems that soybean meal can be replaced by sweet lupin without adverse effects on fish productive performance and supplementation of sweet lupin with DL methionine improved growth rate and feed utilization of blue tilapia fingerlings (Oreochromis aureus). | ||||
| Keywords | ||||
| Fish meal; soybean meal. sweet lupin; Oreochromis aureus fingerlings; DL-Methionine | ||||
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