Departmental Bulletin Paper Effects of rare earth elements and exogenous multienzyme supplementation to plant protein enriched diet on growth performance, digestibility and economic efficiency of Nile tilapia, Oreochromis Niloticus

Eleraky, Wafaa  ,  Ibrahim, Doaa  ,  Mahmoud, Rania

64 ( 2 )  , pp.S73 - S78 , 2016-04 , Graduate School of Veterinary Medicine, Hokkaido University
This study aimed to improve the nutritional value and utilization of plant protein enriched diet for Nile tilapia, Oreochromios Niloticus. The effects of Rare Earth Element (REEs) and two supplemental exogenous multi-enzymes on growth performance, body composition, nutrients digestibility and economic efficiency of Nile tilapia fingerlings were examined over 12-week period. Nile tilapia fingerlings (n=400) averaging 22.61± 0.07g divided into four groups. The 1st group received control diet with no additives the 2nd received the control diet supplemented with 0.05% REEs, 3rd and 4th groups received the control diet supplemented with Roxazyme G2® at 100mg/kg and Avizyme 1500 at 1 gm/kg, each with 0.5 gm/kg phytase, respectively. All growth parameters and condition factor of Nile tilapia were improved by supplementing REEs, Roxazyme and Avizyme when compared with control group. The highest value of Tilapia protein content was observed by addition of these additives. On other hand, the nutrients digestibility were enhanced after addition of Avizyme, Roxazyme and REEs. Additionally, better digestibility for CF was recorded with Avizyme and Roxazyme groups followed by REEs group. Moreover, these additives had positive returns when compared with control group. So, it could be recommend that adding of REEs and exogenous multi-enzymes improve fish growth and profitability by improving the nutrients digestibility of such feed ingredients consequently increasing fish gain.

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