Abstract: To assess the effects of fermented citrus residue（FCR）with respect to growth performance，apparent nutrient digestibility，serum biochemical indexes，as well as antioxidant capacity and immune function in weaned piglets，80‘Landrace×Yorkshire’crossbred weaned piglets with consistent health status and initial body weight of（8. 20±0. 50）kg were selected and randomly divided into 4 groups（each treatment group consisted of 4 replicates with 5 weaned piglets per replicate）. Pigs in the control group were offered a basal diet，while those in the experimental groups were given the basal diet added with 2%，5% and 8% of FCR，recorded as FCR⁃1 group，FCR⁃2 group，and FCR⁃3 group respectively，and the experimental period lasted for 30 days. The results showed that compared with the control group，the final body weights of piglets in the three experimental groups were significantly increased by 7.87%，9.59%，and 10.18% respectively.Average daily gain in the FCR⁃2 and FCR⁃3 groups were both significantly increased by 15.79%. Among them，the FCR⁃2 group had the lowest feed⁃to⁃weight and diarrhea rate，which were decreased by 16.44% and 22.28% respectively. The apparent digestibility of dry matter，crude protein and crude fat in the FCR⁃2 and FCR⁃3 groups was significantly higher than that in the control group.The apparent digestibility of crude fiber and calcium in the FCR⁃2 group was 16. 01% and 9. 88% higher than that in the control group respectively，and the apparent phosphorus digestibility of all experimental groups was markedly enhanced.In comparison with the control group，there was no significant difference in the serum contents of albumin，globulin，albumin/globulin ratio and total protein in the experimental groups，but the blood urea nitrogen content of FCR⁃2 group was significantly decreased by 16.75%.The level of serum total antioxidant capacity，catalase acivity，superoxide dismutase activity and glutathione peroxidase activity were significantly increased across all experimental groups.The catalase activity in the FCR⁃2 and FCR⁃3 groups was increased by 16.53% and 12.16%，respectively，while the malondialdehyde content of FCR⁃1，FCR⁃2 and FCR⁃3 groups was significantly decreased by 5.12%，15.83% and 13.03%，respectively.Additionally，the contents of IgA，IL⁃10 and C3 were significantly elevated in the FCR⁃2 and FCR⁃3 groups；the FCR⁃2 group had the highest IgM content，which was significantly superior to that of the other groups.The TNF⁃α content in the FCR⁃2 and FCR⁃3 groups was 17.64% and 20.69% lower than that in the control group，respectively，and the IL⁃6 content in each experimental group was 10.84%，12.76% and 13.86% lower than that in the control group，respectively.In conclusion，the addition of 5% FCR in the basal diet of weaned piglets can significantly improve their growth performance and nutrient utilization efficiency，while also can optimize serum biochemical status，as well as enhance the body’s antioxidant capacity and immune function，which provides experimental support for the rational application of fermented citrus residue in the diet of weaned piglets.

Key words: Weaned piglet, Fermented citrus residue, Growth performance, Apparent nutrient digestibility, Serum biochemical indexes, Antioxidant capacity, Immune function

摘要： 为探讨发酵沃柑渣（FCR）对断奶仔猪生长性能、养分表观消化率、血清生化指标、机体抗氧化以及免疫机能的作用效果，选取80头健康状况一致、初始体质量（8.20±0.50）kg的“长白×大白”二元断奶仔猪，随机分为4组（每组4个重复，每重复5头），对照组饲喂基础饲粮，试验组分别添加2%、5%、8% FCR，记为FCR-1组、FCR-2组、FCR-3组，试验期30 d。结果表明，与对照组相比，3个试验组仔猪末体质量分别显著提高7.87%、9.59%、10.18%，FCR-2、FCR-3组平均日增质量均显著提高15.79%，其中FCR-2组料重比、腹泻率最低，分别降低16.44%、22.28%；FCR-2、FCR-3组干物质、粗蛋白、粗脂肪表观消化率显著优于对照组，FCR-2组粗纤维、钙表观消化率较对照组分别提升了16.01%、9.88%，各试验组磷表观消化率均显著升高；与对照组相比，试验组血清白蛋白、球蛋白、白球比、总蛋白含量无显著差异，但FCR-2组尿素氮含量显著降低16.75%；各试验组血清总抗氧化能力、过氧化氢酶活性、超氧化物歧化酶活性、谷胱甘肽过氧化物酶活性显著升高，FCR-2、FCR-3组过氧化氢酶活性分别提高16.53%、12.16%，FCR-1、FCR-2、FCR-3组丙二醛含量分别显著降低5.12%、15.83%、13.03%；FCR-2、FCR-3组IgA、IL-10、C3含量显著提高，FCR-2组IgM含量最高且显著优于其他组，FCR-2、FCR-3组TNF-α含量分别低于对照组17.64%、20.69%，各试验组IL-6含量分别低于对照组10.84%、12.76%、13.86%。综上，在断奶仔猪基础饲粮中添加5% FCR可显著改善其生长性能、提高养分利用效率，同时优化血清生化状态、增强机体抗氧化能力与免疫功能，为发酵沃柑渣在断奶仔猪饲粮中的合理应用提供了试验支撑。

关键词: 断奶仔猪, 发酵沃柑渣, 生长性能, 养分表观消化率, 血清生化指标, 抗氧化能力, 免疫机能