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幼建鲤体重(11 37±0 55)g,投喂不添加或添加维生素A的3组试验饲料,进行饲养实验70d,攻毒实验15d和免疫接种实验24d,研究维生素A缺乏对幼建鲤生长性能和免疫功能的影响,结果表明,维生素A缺乏组(0IU/kg)建鲤的成活率、摄食量、增重、净蛋白质沉积率、肥满度、肝胰脏指数、肝胰脏维生素A含量、肠道皱襞高度,头肾重量、脾脏重量和指数、后肾重量和指数、血液红细胞、白细胞数量和血清溶菌酶活力显著降低(P<0 05),且饲料系数显著增加(P<0 05),而对头肾体指数、用灭活嗜水气单胞菌免疫后第10和17天血清抗体水平影响不显著(P>0 05)。基于本实验研究结果,可知维生素A是维持幼建鲤正常生长和免疫机能必不可少的营养成分。当饲料中维生素A含量达到3969IU/kg时,一定程度上可满足幼建鲤正常生长和免疫机能的需要,进一步提高饲料维生素A含量(达23816IU/kg),对幼建鲤生长和饲料利用没有显著影响,但在一定程度可提高其免疫机能。
The body weight of young Jian carp was (11 37 ± 0 55) g, fed with three groups of test diets without adding or adding vitamin A, feeding experiment 70 days, challenge experiment 15 days and immunization experiment 24 days. Growth performance and immune function. The results showed that the survival rate, food intake, weight gain, net protein deposition rate, fatness, hepatopancreas index, liver and pancreas vitamins of Jian carp in vitamin A deficiency group (0 IU / kg) A content, intestinal fold height, head kidney weight, spleen weight and index, kidney weight and index, blood red blood cells, leukocytes and serum lysozyme activity were significantly decreased (P <0 05), and the feed coefficient was significantly increased (P < 0 05). However, there was no significant effect on head kidney index at the 10th and 17th day after immunization with A. hydrophila inactivated (P> 0.05). Based on the results of this experimental study, we know that vitamin A is an essential nutrient to maintain the normal growth and immune function of young Jian carp. When the content of vitamin A in feed reached 3969IU / kg, the content of vitamin A in feed could be increased to a certain extent (up to 23816IU / kg) and the growth and feed utilization of young Jian carp Significant effect, but to some extent, can enhance its immune function.