Phytase and sodium diformate supplementation in a plant‐based diet improves protein and mineral utilization in rainbow trout (Oncorhynchus mykiss) |
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Authors: | G.A. Morales V. Denstadli S.A. Collins L.T. Mydland F.J. Moyano M. Øverland |
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Affiliation: | 1. Department of Animal Production, School of Agriculture, University of Buenos Aires, Buenos Aires, Argentina;2. Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, ?s, Norway;3. Department of Applied Biology, University of Almería, Almería, Spain |
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Abstract: | A basal isonitrogenous and isoenergetic plant‐based diet (Control) was supplemented with either 10 g kg?1 sodium diformate (NaDF), 4000 FTU kg?1 phytase (Phy) or a combination of both additives (NaDF + Phy). Three hundred juvenile rainbow trout with an average weight of 120 g were randomly distributed into 12 fibreglass tanks (300 L). After 65 days of trial, fish fed diets containing phytase, NaDF or the combination of both additives showed a higher growth rate (P < 0.05) compared to fish fed Control diet. NaDF increased feed intake (P = 0.032), while phytase inclusion resulted in a better feed conversion ratio (P < 0.0001) and a higher N retention efficiency (P = 0.02) compared with the Control. Apparent digestibility of P, Ca, Mg and Zn was improved by the use of phytase (P < 0.005) as well as P, Ca and Mg retention efficiency in fish (P < 0.0001). Using 4000 FTU kg?1 phytase in plant‐based diets resulted in a 13% and 50% reduction in N and P loadings, respectively. The use of NaDF in combination with phytase in a plant‐based diet for rainbow trout resulted in a higher weight gain than that when NaDF was used alone. |
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Keywords: | digestibility nutrient waste output organic acid salt phytase phytate rainbow trout |
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