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Partial and total substitution of fish meal by poultry by-product meal in diets for monosex Nile tilapia (Oreochromis niloticus) [electronic resource].

By:

Abdel-Warith, A. A

Contributor(s):

Al-Azab, A. A

Language: English Summary language: Arabic Description: p.1381-1393Other title:

الإحلال الجزئى والكلى لمسحوق السمك بمسحوق مخلفات مجازر الدواجن فى علائق أسماك البلطى النيلى وحيد الجنس [Added title page title]

Uniform titles:

Annals of agricultural science, Moshtohor, 2007 v.45 (4) [electronic resource].

Subject(s):

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In: Annals of agricultural science, Moshtohor 2007.v.45(4)Summary: This study was conducted to evaluate the suitability of poultry by-product meal (PBM) as a partial or total substitution of the fish meal component of practical diets (PBM) for Nile tiIapia fingerlings (mean initial fish weight 23.64g ±0.53 SE). PBM are waste materials of the local poultry industries, which could be used as an animal protein source in diets for some fish species. Six tested diets formulations based on a herring fish meal (HFM) as the reference protein sourcewere usedin this study. The experimental diets were designed to contain PBM at 20, 40, 60, 80 and 100% replacementof tota1 protein content as fish meal in the control diet (100% fish meal). All diets were isonitrogenous and isocaloric in gross terms. Theresultsshowed that therewere significantdifferences (P<0.05)betweenthe finalaveragebody weight of fish at the end of a 12 weeks feeding trial The mean final bodyweight of fish fed control diet, 20 and40% PBM was 83.81, 76.71 and 73.65g, respectively, while that of fish fed 60, 80 and 100% PBM was 66.27, 63.55 and 58.63g, respectively. The poorest response was observed for fish fed 80 and 100%PBM diets. Similar trends were also observed in specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER) and feed intake (Fl). Hepatosomatic index, (HSI) did not reflexany significant differences for all fish fed the experimentaldiets. Economic analysis showedthe possibility of using PBM as an alternative protein source in Nile tilapia feed. Diets contained the levels of 60, 80 and 100% of PBM provided the best economicefficiency of fish weight gaincompared with other tested diets. The results of the present study indicated that the local poultry by-product meal (PBM) can replace at 40% of fish meal in the diets for monosex Nile tilapia without compromising growth and feed conversion. Key words: Monosex Nile tilapia, poultry by-product meal, fish meal, economic analysis.

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This study was conducted to evaluate the suitability of poultry by-product meal (PBM) as a partial or total substitution of the fish meal component of practical diets (PBM) for Nile tiIapia fingerlings (mean initial fish weight 23.64g ±0.53 SE). PBM are waste materials of the local poultry industries, which could be used as an animal protein source in diets for some fish species. Six tested diets formulations based on a herring fish meal (HFM) as the reference protein sourcewere usedin this study. The experimental diets were designed to contain PBM at 20, 40, 60, 80 and 100% replacementof tota1 protein content as fish meal in the control diet (100% fish meal). All diets were isonitrogenous and isocaloric in gross terms. Theresultsshowed that therewere significantdifferences (P<0.05)betweenthe finalaveragebody weight of fish at the end of a 12 weeks feeding trial The mean final bodyweight of fish fed control diet, 20 and40% PBM was 83.81, 76.71 and 73.65g, respectively, while that of fish fed 60, 80 and 100% PBM was 66.27, 63.55 and 58.63g, respectively. The poorest response was observed for fish fed 80 and 100%PBM diets. Similar trends were also observed in specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER) and feed intake (Fl). Hepatosomatic index, (HSI) did not reflexany significant differences for all fish fed the experimentaldiets. Economic analysis showedthe possibility of using PBM as an alternative protein source in Nile tilapia feed. Diets contained the levels of 60, 80 and 100% of PBM provided the best economicefficiency of fish weight gaincompared with other tested diets. The results of the present study indicated that the local poultry by-product meal (PBM) can replace at 40% of fish meal in the diets for monosex Nile tilapia without compromising growth and feed conversion. Key words: Monosex Nile tilapia, poultry by-product meal, fish meal, economic analysis.

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