Protein level affects the relative lysine requirement of growing rainbow trout (Oncorhynchus mykiss) fry

The effect of two digestible protein levels (310 and 469g/kg DM) on the relative lysine (Lys; g Lys/kg DM or g Lys/100g protein) and the absolute Lys (g Lys intake/kg(0.75) per d) requirements was studied in rainbow trout fry using a dose-response trial. At each protein level, sixteen isoenergetic (...

Full description

Bibliographic Details
Published in:British Journal of Nutrition
Main Authors: Bodin, Noelie, Govaerts, Bernadette, Abboudi, Tarik, Detavernier, Christel, De Saeger, Sarah, Larondelle, Yvan, Rollin, Xavier
Format: Article in Journal/Newspaper
Language:English
Published: 2009
Subjects:
Agriculture and Food Sciences
MAINTENANCE THREONINE REQUIREMENT
AMINO-ACID-REQUIREMENTS
SALMON SALMO-SALAR
4-PARAMETER LOGISTIC MODEL
WHOLE-BODY THREONINE
DIETARY-PROTEIN
WEANLING SWINE
ATLANTIC SALMON
SEMIPURIFIED DIET
L. FRY
Atlantic salmon
Salmo salar
Online Access:https://biblio.ugent.be/publication/807860
http://hdl.handle.net/1854/LU-807860
https://doi.org/10.1017/S0007114508158986
https://biblio.ugent.be/publication/807860/file/1056532
Description
Summary:The effect of two digestible protein levels (310 and 469g/kg DM) on the relative lysine (Lys; g Lys/kg DM or g Lys/100g protein) and the absolute Lys (g Lys intake/kg(0.75) per d) requirements was studied in rainbow trout fry using a dose-response trial. At each protein level, sixteen isoenergetic (22-23 MJ digestible energy/kg DM) diets were tested, involving a full range (2-70 g/kg DM) of sixteen Lys levels. Each diet was given to one group of sixty rainbow trout fry (mean initial body weight 0.78g) reared at 15 degrees C for 31 feeding d. The Lys requirements were estimated based on the relationships between weight, protein, and Lys gains (g/kg(0.75) per d) and Lys concentration (g/kg DM or g/100 g protein) or Lys intake (g/kg(0.75) per d), using the broken-line model (BLM) and the non-linear four-parameter saturation kinetics model (SKM-4). Both the model and the response criterion chosen markedly impacted the relative Lys requirement. The relative Lys requirement for Lys gain of rainbow trout estimated with the BLM (and SKM-4 at 90% of the maximum response) increased from 16.8 (19.6) g/kg DM at a low protein level to 23.4 (24.5) g/kg DM at a high protein level. However, the dietary protein content affected neither the absolute Lys requirement nor the relative Lys requirement expressed as g Lys/100g protein nor the Lys requirement for maintenance (21 mg Lys/kg(0.75) per d).

Similar Items