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Evaluation of Optimum Dietary Threonine Requirement by Plasma Free Threonine and Ammonia Concentrations in Surgically Modified Rainbow Trout, Oncorhynchus mykiss

  • Yun, Hyeonho (Department of Marine Bio-Materials and Aquaculture/Feeds and Foods Nutrition Research Center, Pukyong National University) ;
  • Park, Gunjun (Woosung Feed Co., Ltd.) ;
  • Ok, Imho (Aqua leader, Co., Ltd.) ;
  • Katya, Kumar (Department of Marine Bio-Materials and Aquaculture/Feeds and Foods Nutrition Research Center, Pukyong National University) ;
  • Heung, Silas (Department of Animal Science, University of California) ;
  • Bai, Sungchul C. (Department of Marine Bio-Materials and Aquaculture/Feeds and Foods Nutrition Research Center, Pukyong National University)
  • Received : 2014.07.03
  • Accepted : 2014.11.17
  • Published : 2015.04.01

Abstract

This study was carried out to evaluate the dietary threonine requirement by measuring the plasma free threonine and ammonia concentrations in rainbow trout, Oncorhynchus mykiss after dorsal aorta cannulation. A total of 70 fish (average initial weight $506{\pm}8.2g$) were randomly distributed into each of the 14 net cages (5 fish/cage). After 48 hours (h) of feed deprivation, each group was intubated at 1% body weight with one of the seven L-amino acid based diets containing graded levels of threonine (0.42%, 0.72%, 0.92%, 1.12%, 1.32%, 1.52%, or 1.82% of diet, dry matter basis). Blood samples were taken at 0, 5, and 24 h after intubation. Post-prandial plasma free threonine concentrations (PPthr) of fish 5 h after intubation with diets containing 1.32% or more threonine were significantly higher than those of fish intubated with diets containing 1.12% or less threonine (p<0.05). Post-absorptive free threonine concentrations (PAthr) after 24 h of intubation of the fish with diets containing 0.92% or more threonine were significantly higher than those of fish intubated with diets containing 0.72% or less threonine. Post-prandial plasma ammonia concentrations (PPA, 5 h after intubation) were not significantly different among fish intubated with diets containing 1.12% or less threonine, except the PPA of fish intubated with diet containing 0.42% threonine. Broken-line model analyses of PPthr, PAthr, and PPA indicated that the dietary threonine requirement of rainbow trout should be between 0.95% (2.71) and 1.07% (3.06) of diet (% of dietary protein on a dry matter basis).

Keywords

Rainbow Trout;Threonine;Plasma;Dorsal Aorta Cannulation

Acknowledgement

Supported by : National Fisheries Research and Development Institute

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