Effect of diet composition and lysine supply on growth and body composition in juvenile turbot (Psetta maxima).

Kroeckel, S., Dietz, C., Schulz, Carsten and Susenbeth, A. (2013) Effect of diet composition and lysine supply on growth and body composition in juvenile turbot (Psetta maxima). Archives of Animal Nutrition, 67 (4). pp. 330-345. DOI 10.1080/1745039x.2013.823305.

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Supplementary data:

Abstract

A 10-week feeding trial was conducted to study the effect of feeding level and dietary lysine concentration on growth, protein and lysine retention, and body composition in juvenile turbot. Maintenance requirement for lysine and the efficiency of lysine utilisation were determined as well. Two experimental diets were formulated based on fishmeal or wheat gluten as main protein sources, containing 6.4 g (Diet A, control) and 4.5 g lysine per 100 g CP (Diet B), respectively. Diets were fed once daily at six feeding levels (per day 0.3%, 0.6%, 0.9%, 1.2%, and 1.5% of body weight [BW] and ad libitum) to a total of 432 fish of 48 g initial BW. No differences in the growth parameters were observed between diets at the same feeding level, except a lower feed to gain ratio (p<0.05) at the highest feeding level at Diet B. Whole-body composition was not affected by diet, whereas muscle protein concentration was significantly lower for fish fed Diet B. Amino acid concentration in whole-body protein was affected by dietary treatment and fish fed Diet B showed lower concentrations of all essential amino acids. In fish muscle protein, lysine, methionine, leucine, isoleucine, and valine concentrations were significantly lower in Diet B. Efficiency of lysine utilisation for growth (k(lys)) was determined by linear regression analysis and amounted for 0.69 for Diet B. The maintenance lysine requirement defined at zero lysine retention was 6.5 mg.kg(-0.8).d(-1). Lysine intakes at zero protein retention were 13.0 mg and 12.9 mg.kg(-0.8).d(-1) for Diet A and B, respectively. Growth and nutrient retention were similar for both diets and, therefore, a lysine deficiency in Diet B did not occur. In conclusion, a proportion of 330 g wheat gluten per kg feed did not influence growth performance and maintenance requirement for lysine in juvenile turbot. However, the effect of diet composition on the amino acid profile of body protein might be relevant for the derivation of the amino acid requirement from protein retention.

Document Type: Article
Additional Information: Times Cited: 0 Kroeckel, Saskia Dietz, Carsten Schulz, Carsten Susenbeth, Andreas
Keywords: amino acids, lysine, maintenance, Psetta maxima, requirements, utilisation, wheat gluten
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1080/1745039x.2013.823305
ISSN: 1745-039X
Projects: Future Ocean
Date Deposited: 08 Jul 2014 09:29
Last Modified: 23 Jul 2019 09:01
URI: http://oceanrep.geomar.de/id/eprint/25040

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