Effect of dietary phytic acid and semi‐purified lignin on energy storage indices, growth performance, nutrient and energy partitioning of rainbow trout, Oncorhynchus mykiss

• Published in: Aquaculture nutrition Vol. 21; no. 6; pp. 843 - 852
• Main Authors: Chowdhury, M.A.K, Martie, T, Bureau, D.P
• Format: Journal Article
• Language: English
• Published: Oxford Blackwell Science 01.12.2015; Blackwell Publishing Ltd; Hindawi Limited
• Subjects: Amino acids; animal organs; antinutritional factors; Body condition; Carcasses; cysteine; Deposition; Diet; Energy; Energy storage; essential amino acids; Fish; Freshwater fishes; Growth; growth performance; histidine; Interactions; Lignin; Lipids; Lysine; meat carcasses; Methionine; Mineral nutrients; nitrogen; nutrient partitioning; nutrient retention efficiency; Nutrients; Oncorhynchus mykiss; phytic acid; protein deposition; Proteins; rainbow trout; Retention; Salmon; Threonine; Trout; tryptophan
• ISSN: 1353-5773; 1365-2095
• DOI: 10.1111/anu.12208

The effect of dietary phytic acid (PA) and semi‐purified lignin, and their interactions on growth performance, energy storage indices, nutrient deposition and partitioning in rainbow trout were studied in a 12‐week growth trial. Six isoproteic and isoenergetic diets were formulated differing only in their PA and lignin concentrations. In these diets, five essential amino acids: histidine, lysine, methionine (+ cysteine), threonine and tryptophan were formulated to be marginally adequate to the dietary requirement. Fish were pair‐fed with the amount of feed adjusted on a weekly basis. Among the performance indicators, dietary PA levels affected only the Fulton's body condition index (FCI) and whole carcass nitrogen retention efficiency (NRE; P < 0.05). On the contrary, lignin did not affect the whole carcass protein deposition (PD) and NRE but the lipid deposition (LD; P < 0.05), lipid retention efficiency (LRE; P < 0.01) and PD‐LD ratio (P < 0.05). Neither lignin nor phytic acid affected any parameters in dressed carcass and in viscera of rainbow trout except the visceral LD, which was affected only by the PA‐lignin interactions (P < 0.05).