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Feeding regime does not influence lysine utilisation by Atlantic salmon, Salmo salar L., parr

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Hauler, RC and Carter, CG and Edwards, SJ (2007) Feeding regime does not influence lysine utilisation by Atlantic salmon, Salmo salar L., parr. Aquaculture, 273 (4). pp. 545-555. ISSN 0044-8486

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Abstract

This study investigated whether the efficiency of lysine utilisation for liveweight gain, protein gain and lysine gain was affected by feeding regime in Atlantic salmon (Salmo salar L.) parr. Twelve diets containing from 10.15 to 20.79 g dietary digestible lysine kg− 1 were hand-fed either to satiation or to a controlled fixed ration. The controlled ration was set to equal the feed intake of the basal (lowest) lysine diet so that any growth above that of the group fed the basal diet at the controlled ration was due entirely to the additional dietary lysine. For both feeding regimes, with increasing dietary lysine there were significant linear increases in liveweight gain (P < 0.001) and in protein (P < 0.001) and lysine (P < 0.01) concentration of liveweight gain. Increasing dietary lysine resulted in a significant (P < 0.001) linear increase in feed intake at satiation. Efficiency of lysine utilisation for liveweight gain above maintenance lysine intake was significantly (P < 0.005) higher at satiation than for the controlled ration: 47.7 compared to 34.9 mg liveweight gain per mg digestible lysine intake, respectively. However, feeding regime had no significant effect on the efficiency of lysine utilisation for protein or lysine gain. This study demonstrated that feed intake does not influence the efficiency of lysine utilisation for protein or lysine gain in Atlantic salmon parr. The change in weight-specific lysine composition suggests a robust physiological mechanism maintaining the efficiency of lysine utilisation for lysine gain in Atlantic salmon parr.

Item Type: Article
Keywords: Amino acid requirements; Atlantic salmon; Factorial growth model; Lysine requirements; Lysine utilisation
Journal or Publication Title: Aquaculture
Publisher: Elsevier BV
Page Range: pp. 545-555
ISSN: 0044-8486
Identification Number - DOI: 10.1016/j.aquaculture.2007.10.045
Additional Information:

The definitive version is available at http://www.sciencedirect.com

Date Deposited: 07 Apr 2008 14:23
Last Modified: 18 Nov 2014 03:34
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