本试验旨在研究饲粮中添加甘露寡糖（MOS）对坝上长尾鸡种鸡繁殖性能和雏鸡母源抗体的影响。选取2 400只273日龄的坝上长尾鸡种鸡，随机分为4个组（试验1~4组），分别在基础饲粮中添加0、0.5、1.0和2.0 g/kg的甘露寡糖，每个组设3个重复，每个重复200只鸡，采用人工授精技术，试验期为35 d。试验第31天开始收集种蛋，连续5 d，计算产蛋率、料蛋比、种蛋合格率、入孵种蛋受精率、受精蛋孵化率及死胚率；出雏后检测死亡鸡胚蛋壳内膜大肠杆菌和沙门氏菌的数量，测定1日龄雏鸡血清中新城疫和法氏囊抗体效价。结果表明：与试验1组相比，试验4组的产蛋率、种蛋合格率、种蛋受精率和受精蛋孵化率均极显著提高（P<0.01），料蛋比和死胚率极显著降低（P<0.01），破蛋率显著降低（P<0.05），死亡胚胎大肠杆菌数量显著降低（P<0.05），1日龄雏鸡新城疫和法氏囊抗体效价有升高的趋势（P>0.05）。结果提示，饲粮添加MOS能够提高坝上长尾鸡种鸡的繁殖性能和入孵种蛋孵化率以及雏鸡新城疫和法氏囊母源抗体效价，减少鸡胚的大肠杆菌感染，且以饲粮中添加量为2.0 g/kg效果最佳。

This study was conducted to explore the effects of dietary mannose oligosaccharides (MOS) on the reproductive performance of Bashang long-tail breeding hens and maternal antibodies of their chicks. A total of 2 400 Bashang long-tailed breeding hens of 273-day-old were selected and randomly divided into 4 groups (test groups 1 to 4), and supplemented with 0, 0.5, 1.0 and 2.0 g/kg MOS in the basal diet, respectively. Each test group had 3 replicates and 200 chickens in each replicate. The artificial insemination technology was used and the test period was 35 days. The breeding eggs were collected on the 31^th day of the experiment for 5 days, and the laying rate, feed to egg ratio, qualified breeding egg rate, fertility rate of hatching breeding eggs, hatching rate of fertilized eggs and dead embryo rate were calculated; the number of Escherichia coli and Salmonella in the inner membrane of dead chicken embryo eggshell were detected after hatching; and the serum antibody titers of Newcastle disease and bursa of Fabricius of chicks at 1-day-old were measured. The results showed that, compared with the test group 1, the laying rate, qualified breeding egg rate, fertility rate of breeding eggs and hatching rate of fertilized egg were extremely significantly increased (P<0.01), the feed to egg ratio and the dead embryo rate were extremely significantly decreased (P<0.01), the broken egg rate was significantly decreased (P<0.05), the Escherichia coli number in the dead embryos was significantly decreased (P<0.05), and the antibody titers of Newcastle disease and bursa of Fabricius of 1-day-old chicks were also showed an upward trend (P>0.05) in the test group 4. These results indicate that the dietary MOS can enhance reproductive performance of Bashang long-tail breeding hens, improve the hatchability of hatched breeding eggs, increase the antibody titers of Newcastle disease and bursa of Fabriciusc, and reduce the Escherichia coli infection in the chicken embryo. The best effect is obtained by supplementing 2.0 g/kg MOS in the diet.