Effect of high digestible protein to digestible energy ratio on lysine utilisation by Atlantic salmon, Salmo salar L., parr

This study investigated the efficiency of lysine utilisation for liveweight gain (LG), protein gain (PG) and lysinegain (LysG) in Atlantic salmon (Salmo salar L.) parr fed a diet with a high digestible protein (DP) to digestibleenergy (DE) ratio. Twelve diets containing 10.15 to 20.79 g dietary dige...

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Bibliographic Details
Published in:Aquaculture
Main Authors: Carter, CG, Hauler, RC
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier Science Bv 2011
Subjects:
Agricultural and Veterinary Sciences
Fisheries Sciences
Aquaculture
Atlantic salmon
Salmo salar
Online Access:https://doi.org/10.1016/j.aquaculture.2010.11.045
http://ecite.utas.edu.au/71705
Description
Summary:This study investigated the efficiency of lysine utilisation for liveweight gain (LG), protein gain (PG) and lysinegain (LysG) in Atlantic salmon (Salmo salar L.) parr fed a diet with a high digestible protein (DP) to digestibleenergy (DE) ratio. Twelve diets containing 10.15 to 20.79 g dietary digestible lysine (DDLys) kg−1 at aconstant 25.0 g DPMJ DE−1 (25.0 DP DE−1) were fed at a fixed ration for 50 days. With increasing DDLys therewas a significant (Pb0.001) linear increase in LG. Whole-body crude protein and lysine content increasedwith increasing wet weight (W), with weight exponents b (Wb) of 1.58 and 2.47, respectively. There weresignificant linear relationships between digestible lysine intake (DLysI) and LG, PG and LysG. The relationshipbetween DLysI and LysG predicted a maintenance lysine requirement of 7.7 mg kg−0.75 d−1 and an efficiencyof 77% for lysine utilisation for lysine gain above maintenance lysine intake. To further examine the effect ofthe DP DE ratio on lysine utilisation comparison was made to a similar study that used a lower DP DE ratio of19.8 DP DE−1. Comparison between linear relationships for LG, PG and LysG from the two experimentsshowed that there were no significant differences between the efficiency of lysine utilisation (slopes) for LG,PG or LysG, nor were there significant differences between the elevations for PG and LysG. This studydemonstrated that at two fixed but different protein and energy intakes the dietary DP DE ratio did notinfluence the efficiency of lysine utilisation for lysine gain over a range of dietary lysine and digestible lysineintakes.

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