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English :
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Partial replacement of fish meal with different animal by-product meals in diets of Nile Tilapia (Oreochromis Niloticus)
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Arabic :
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الاحلال الجزئى لمسحوق السمك بمساحيق المخلفات الحيوانية في علائق البلطى النيلى.
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| Abstract |
The feeding experiment was conducted to evaluate the nutritive value of nine experimental diets made from different sources and levels of four animal by-product meals. The animal by-product meals were: hatchery dried poultry waste, poultry by-product meal, fish viscera meal and feather' meal. The experimental diets were fed to Nile tilapia over experimental period of ten weeks (75 feeding days). The diets were formulated to contain 30%, protein, in which fish meal protein was substituted with animal by product meal at levels of 25% and 50%, of total fish meal protein. Apparent digestibility of protein ranged 87.6 - 91.9% among experimental diets. The highest coefficient was obtained using the control, poultry by-product meal 50% and fish viscera meal 50%, with values of 91.9, 91.8 and 90.8%, respectively. The results of this study showed that there are possibilities of partial substitution of fish meal protein with those of protein in poultry by-product meal, fish viscera meal, hatchery dried poultry waste and feather meals in feed mixtures for O. niloticus up to 50% of the fish meal protein, without adversely affecting the protein, digestibility of the diets.
The inclusion of these four sources of animal by-product meals up to 50% of fish meal protein had no significant effect on specific growth rates of Nile tilapia fingerlings. Best feed conversion ratios were obtained with the control diet (2.04) and diets containing both poultry by- product meal 50% (1.7) and fish viscera meal 50% (2.08) than those obtained with other diets (2.2 - 2.6). The results indicate that Nile tilapia can be fed practical diets containing up to 50% poultry by-product meal, fish viscera meal and feather meal protein as partial replacement of fish meal protein without reducing growth or protein efficiency ratio values, however, hatchery dried poultry waste should be included in practical diets up to 25%, since FCR and PER were significantly retarded at higher levels. The results for protein productive values were high for all animal by-product meal treatments as well as those of the control, except for that of the hatchery dried poultry waste 50%, diet, showing good nutritional quality of these animal by-product meals. Muscle lipid and ash contents of fish fed the animal by-product meal diets were comparable to those of fish fed the control diet, with little differences among treatments, while muscle protein content of fish fed the animal by-product meal diets were comparable or higher than those fed the control diet. The feed costs for producing one kilogram of Nile tilapia was significantly lowest for the poultry by-product meal diet 50% (2.17 L.E/kg), followed by that of the control diet (2.9 L.E/kg). However, feed production costs for other animal by-product meal diets_.(2.92- 3.36 L.E/kg) were similar to that of the control diet (P>0.05).
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| Publication year |
2003
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| Pages |
142p.
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
818
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| Organization Name |
Animal Production Research Institute (APRI)
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| Country |
Egypt
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| Department |
Agricultural By-products Utilization Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal feeding
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AGROVOC
TERMS |
Byproducts.
Digestibility.
Feather meal.
Fish meal.
Oreochromis niloticus.
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| Publication Type |
PhD Thesis
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