Digestibility of dry matter, protein, starch and lipid by cod, Gadus morhua: comparison of sampling methods

Atlantic cod were fed 11 different extruded diets spanned by a multiple simplex design. The dietary ranges of protein, fat and starch were 36–66%, 8–28% and 8–18%, respectively. All diets contained 0.1% yttrium oxide as an inert marker. After several months of feeding, faeces were sampled, either by...

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Bibliographic Details
Published in:Aquaculture 2003-07, Vol.225 (1), p.225-232
Main Authors: Hemre, G.-I, Karlsen, Ø, Mangor-Jensen, A, Rosenlund, G
Format: Article
Language:English
Subjects:
Animal aquaculture
Animal productions
Aquaculture
Biological and medical sciences
Carbohydrates
Cod
Comparative analysis
Diet
Digestibility
Digestive system
Fish
Fundamental and applied biological sciences. Psychology
Gadus morhua
Lipids
Macronutrients
Marine
Pisciculture
Proteins
Sampling methods
Vertebrate aquaculture
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Summary:Atlantic cod were fed 11 different extruded diets spanned by a multiple simplex design. The dietary ranges of protein, fat and starch were 36–66%, 8–28% and 8–18%, respectively. All diets contained 0.1% yttrium oxide as an inert marker. After several months of feeding, faeces were sampled, either by stripping or by dissecting the last part of the intestine, which in turn was frozen and faecal matter removed while still partly frozen. No significant differences were found in average digestibility results of dry matter, protein, starch or lipid when comparing the two methods of sampling. All groups showed high digestibility of dry matter, protein and lipid, with minor variations, and only extreme feed compositions resulted in changed digestibility of dry matter and protein. A larger variation was found in apparent starch digestibility, from 60% to 90%, however, independent of dietary level when this was below 17% of dry matter, in agreement with findings for this nutrient as concerns other carnivorous fish. No difference was detected for any of the compared digestibility coefficients when evaluating the four centre points of the multiple simplex design. In conclusion, no difference between methods gives the opportunity to freely choose sampling method, and either stripping or dissection of faecal matter can be used to determine apparent digestibility values in cod.
ISSN:0044-8486
1873-5622
DOI:10.1016/S0044-8486(03)00291-6