本试验旨在研究不同来源和水平维生素C对建鲤生长性能和消化功能的影响。选用平均体重为（12.63±0.04） g的健康建鲤600尾，随机分为4组（每组设3个重复，每个重复50尾），分别饲喂添加不同来源[乙基纤维素包被维生素C（EC-AA）和维生素C磷酸酯钙盐（LAPP）]和剂量(75和150 mg/kg)的维生素C的实用饲料，试验期为8周。结果表明，饲料维生素C水平为75 mg/kg时，LAPP组建鲤在特定生长率（SGR）、摄食量（FI）、蛋白质沉积率(PPV)和脂肪沉积率(LPV)上均显著高于EC-AA组（P<0.05）。同时，LAPP饲料较EC-AA饲料显著促进建鲤肝胰脏和肠道生长发育，并显著提高肠道胰蛋白酶、糜蛋白酶和脂肪酶活性，各肠段皱襞高度，各肠段碱性磷酸酶（AKP）和γ-谷氨酰转肽酶（γ-GT）活性，前、后肠Na+,K+-ATP酶以及全肠肌酸激酶（CK）活性（P<0.05）。饲料维生素C水平为150 mg/kg时，LAPP组和ECAA组建鲤在SGR、FI、PPV和LPV上差异不显著（P>0.05）,但LAPP饲料较EC-AA饲料能显著提高建鲤肠道胰蛋白酶和糜蛋白酶活性，中、后肠皱襞高度，后肠AKP、前肠Na+,K+-ATP酶和各肠段γ-GT活性（P<0.05）。由此得出，在本试验条件下，LAPP的使用效果优于EC-AA，75 mg/kg剂量下能更显著地提高建鲤生长性能和消化功能。
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］
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