Effects of phytase with inorganic phosphorus supplement diet on nutrient availability of Japanese flounder (Paralichthys olivaceus)
2006
Sarker, P.K.(Kochi Univ., Nankoku (Japan). Faculty of Agriculture) | ; Fukada, H. | ; Hosokawa, H. | ; Masumoto, T.
The present study investigated the efficacy of phytase with graded level of dietary phosphorus (P) on improvement of nutrient availability in soybean meal containing diet for Japanese flounder. Experimental diets where P sources were omitted from the mineral mixture, and graded level of inorganic P (0, 200, 400, 600 and 800 mg/100 g diet) with phytase (300 FTU/100 g diet) were assigned in duplicate tanks and fed to juvenile Japanese flounder (average weight 9 g) for 40 days. Supplementation of phytase into the diet significantly improved protein and P absorbability compared to control diet. Growth parameters and P retentions were improved in fish fed diet phytase and P supplementations. Among the dietary treatments, P supplement level of 400 mg was the best P retention. The results indicated that phytase with 400 mg P supplemented diet significantly improved the weight gain and minerals availability comparing to control. These findings lead to reduce the excess supplementation inorganic P addition in diet and finally the P discharge into the environment.
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