Phytase and sodium diformate supplementation in a plant‐based diet improves protein and mineral utilization in rainbow trout (Oncorhynchus mykiss). (4th September 2015)

• Record Type: Journal Article
• Authors: Morales, G.A.; Denstadli, V.; Collins, S.A.; Mydland, L.T.; Moyano, F.J.; Øverland, M.
• Is Part Of: Aquaculture nutrition. Volume 22:Number 6(2016:Dec.)
• Page Start: 1301
• Page End: 1311
• Publication Date: 2015-09-04
• Subjects: digestibility -- nutrient waste output -- organic acid salt -- phytase -- phytate -- rainbow trout; Aquaculture -- Periodicals; Aquatic animals -- Feeding and feeds -- Periodicals; Fishes -- Feeding and feeds -- Periodicals; 639.3
• DOI: 10.1111/anu.12340
• Languages: English
• ISSNs: 1353-5773

Abstract

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.