Effect of Chitosan on Growth and Dietary Digestibility of Carassius auratus gibelio
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Abstract
The trial was divided into one control group and three tested ones. Each group was in triaplicate. Gibel carp, Carassius auratus gibelio [initial mass of (78.31±2.15)g] with fifty for every pond were fed with control diet in control group and tested ones were control diet with chitosan of 0.25%,0.50% and 1.00% in three tested groups below indoor temperature respectively. Muscle components were determined with national standard Method. The digestibilities of the dietary general energy and nutriment were determined by the indirect way of external indicator Cr2O3 and the survive ratio,the specific growth rate (SGR),the feed coefficient,the protein efficiency,protein retention, RNA/DNA ratio in white muscle were measured in order to investigate influence of the chitosan on the digestibilities and the utilization of the dietary nutriments and general energy of gibel carp after 64 d feeding period. Results showed that the supplement with 0.50% or more chitosan could improve the SGR,protein digestibility,the RNA/DNA ratio in white muscle (P<0.05) and decrease the fat digestibility of gibel carp respectively (P<0.05). The supplement with 0.50% chitosan could improve the protein efficiency,protein retention and the digestibility of the dietary general energy (P<0.05) and decrease the feed coefficient of the fish respectively (P<0.05). The supplement with 0.25% and 0.50% chitosan could improve ash content in muscle (P<0.05). Therefore,the supplement with 0.50% chitosan in gibel carp diet could improve the growth and the digestibilities of the dietary nutriments and general energy and decrease the feed coefficient of gibel carp.
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