Verdaulichkeit, wachstum und körperzusammensetzung von karpfen (Cyprinus carpio L.) nach verfütterung verschiedener stärkearten

Abstract

Maize starch (treatment I), pregelatinized maize starch (II), wheat starch (III), pregelatinized wheat starch (IV), potato starch (V) or manioc meal (VI) were mixed in portions of 41% (I-V) or 46.7% (VI) to a basal diet. Each experimental diet was fed to 33 carp (Cyprinus carpio L.) (three aquaria with 11 carp each) in a daily amount of 1.8-2.0% of live weight. The experiment lasted 118 days and the carp had a mean live weight of 146 g at the beginning. The diets I-IV had a similar, high energy digestibility of about 90%, whereas the diet with potato starch and the diet with manioc meal significantly lowered the digestibility of the energy to 85% or 87%. The growth and the feed expenditure were not influenced by the different starches. The carp had a mean final weight of 520 g. All carcasses had, on average, a content of ash, protein, fat and energy of 2.8%, 15.7%, 9.4% and 7.4 kJ per g fresh matter. However, potato starch and manioc meal distinctly reduced the energy retention in comparison to maize and wheat starch (diet I or III) because the contents of dry matter, fat and energy of the carcasses of these carp were significantly lowered.