The effect of varying dietary digestible protein and digestible non-protein energy sources on growth, nutrient utilization efficiencies and body composition of carp (Cyprinus carpio ) evaluated with a two-factorial central composite study design.

Heinitz, M. C., Figueiredo Silva, C., Schulz, C. and Lemme, A. (2017) The effect of varying dietary digestible protein and digestible non-protein energy sources on growth, nutrient utilization efficiencies and body composition of carp (Cyprinus carpio ) evaluated with a two-factorial central composite study design. Aquaculture Nutrition, 24 . DOI 10.1111/anu.12601.

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Abstract

To determine optimized dietary nutrient supply for common carp (Cyprinus carpio), nine isoenergetic diets were formulated according to a two-factorial central composite design on digestible basis. Digestible protein contents (DP) in diets ranged from 208.8 to 251.2 g/kg, and digestible fat-to-digestible carbohydrate energy ratios (DEF/DEC) varied from 0.79 to 1.21. Carp were fed four times a day at a daily feeding rate of 2.5 g/kg body weight for 56 days. Optima of responses were determined by applying the standard least squares method according to response surface methodology. All diets resulted in excellent performance with feed conversion ratios lower than 1 and digestible protein efficiency ratios (PERdig) higher than 4.6. For most parameters, calculated extreme values were minimum points, except for FCR, retention efficiencies of digestible arginine (RetArgdig) and of digestible methionine (RetMetdig), being maximum points, and retention efficiencies of digestible isoleucine, digestible sulphuric amino acids and digestible lysine, being saddle points. Highest growth and feed utilization efficiency were graphically determined for a diet containing 208.8 g/kg DP/1.21 DEF/DEC. Body lipid was optically increased for 251.2 g/kg DP/0.79 DEF/DEC in comparison with 208.8 g/kg DP/1.21 DEF/DEC.

Document Type: Article
Keywords: carp central composite design digestible protein energy non‐protein energy sources response surface methodology
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1111/anu.12601
ISSN: 1353-5773
Projects: Future Ocean
Date Deposited: 21 Dec 2017 12:24
Last Modified: 25 Apr 2019 10:00
URI: http://oceanrep.geomar.de/id/eprint/41092

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