The experiment was conducted to study the effects of different sources and levels of vitamin C on growth performance and digestive function of Jian carp (Cyprinus carpio var. Jian). Six hundred Jian carp with initial average body weight of (12.63±0.04) g were randomly allocated to 4 groups (with 3 replicates per group and 50 fish per replicate). The Jian carp were fed with practice diets supplemented with different levels (75 or 150 mg/kg diet) of ethylcellulose-coated ascorbic acid (EC-AA) or L-ascorbyl polyphosphate (LAPP) for 8 weeks. When supplemented with 75 mg/kg vitamin C in diets, specific growth rate （SGR）, feed intake （FI）, protein production value (PPV) and lipid production value (LPV) of carp in LAPP group were all significantly higher than those in EC-AA group (P<0.05). Meanwhile, compared with the EC-AA diet, the LAPP diet could significantly improve the growth and development of hepatopancreas and intestine, and enhance the activities of tryspin, chymotrypsin and lipase in intestine, folds height in different intestine segments, activities of alkaline phosphatase (AKP) and glutamyl transpeptidase (γ-GT) in different intestine segments, and activities of Na+,K+-ATPase in proximal and distal intestine segments and creatine kinase (CK) in whole intestine (P<0.05). Whereas, when supplemented with 150 mg/kg vitamin C in diets, the SGR, FI, PPV and LPV were not significantly different between LAPP group and EC-AA group (P>0.05). However, compared with the EC-AA diet, the LAPP diet could significantly enhance the activities of tryspin and chymotrypsin in intestine, folds height in mid and distal intestine segments, activities of AKP in distal intestine, Na+,K+-ATPase in proximal intestine and γ-GT in different intestine segments (P<0.05). In conclusion, the effect of LAPP is better than EC-AA for Jian carp, and the LAPP supplementation of 75 mg/kg vitamin C can more significantly improve the growth performance and digestion function of Jian carp.［Chinese Journal of Animal Nutrition, 2011, 23（8）：1332 -1341］
LIU Yang,CHI Lei,FENG Lin,ZHOU Xiaoqiu
. Different Sources and Levels of Vitamin C in Jian Carp (Cyprinus carpio var. Jian): A Comparison of Their Effects on
Growth Performance and Digestion Function[J]. Chinese Journal of Animal Nutrition, 2011
, 23(08)
: 1332
-1341
.
DOI: 10.3969/j.issn.1006-267x.2011.08.012
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