中文摘要：

选择500只健康、20周龄的海兰褐蛋鸡,预饲30 d后随机平均分为5组,每组4个重复,分别进行如下处理：生理盐水仅第1天注射一次组（A组,对照组）、可卡因—苯丙胺调节转录肽（CART）特异性双链RNA（dsRNA）仅第1天注射一次组（B组）、CART dsRNA每40 d注射一次组（C组）、CART dsRNA每20 d注射一次组（D组）、CART dsRNA每10 d注射一次组（E组）,120 d后对各处理组蛋鸡的产蛋性能、蛋品质、蛋组分和体重变化进行测定,研究CART对产蛋期蛋鸡的产蛋性能和蛋品质的影响.结果表明：各试验组之间以及与对照组之间在产蛋率上均存在差异（P〈0.05）;B组的日产蛋量与对照组的差异不显著,其他试验组与对照组的差异显著（P〈0.05）;各试验组的采食量均高于对照组（P〈0.05）;从蛋料比来看,B、C组与对照组的差异不显著,D组与E组的差异不显著,但均与对照组存在差异（P〈0.05）;各试验组蛋品质、蛋组分与对照组的差异不显著;试验结束后,各试验组蛋鸡的体重变化与对照组均存在差异（P〈0.05）.总之,CART dsRNA对海兰褐蛋鸡产蛋性能和体重变化的影响显著,对蛋品质和蛋组分的影响不显著.

英文摘要：

To investigate the effect of cocaine-and amphetamine-regulated transcript （ CART ） on production performance and egg quality of laying hen in laying period, 500 20-week-old healthy highland brown laying hens were randomized into 5 groups with 4 replications per group. Four treatments, which included no injection as the control （ group A） , and injections with CART specificity of double-stranded RNA （ dsRNA） on the 1st day （ group B） , every 40 d （ group C） , every 20 d （ group D） and every 10 d （ group E） , were applied after hens were fed for 30 d. Egg production performance, including egg quantity, quality, and composition, and body weight of hens were measured after 120-day treatment. Results showed that body weight and laying rate varied significantly a-mong treatment groups （P〈0.05）. All injected groups differed significantly from the control in average daily egg production （P〈0.05） , except that no difference existed between group B and the control. Feed intakes of all injected groups were significantly high-er than the control （ P〈0.05） , however, they were the same statistically among all injected groups. With regard to egg-feed ratio, all injected groups differed from the control （ P〈0.05） , however, no difference existed among groups A, B and C, and between groups D and E. In a word, CART dsRNA exerts significant impacts on laying performance and body weight of laying hens but not on egg quality and components.