血浆蛋白粉不同时间饲喂对肉鸡免疫功能的影响

Effects of spray-dried porcine plasma on broilers production

选用1日龄AA肉鸡240只，随机分为4个处理，每个处理6个重复，每个重复10只鸡。处理一为基础日粮组，处理二、三、四分别添加2.5％血浆蛋白粉（SDPP）替代基础日粮中部分蛋白饲喂7、14、21d后，换喂相同日粮直到49d试验结束。前期饲喂21d后，从每个处理中选择接近平均体质量健康鸡8只腹腔注射大肠杆菌O2攻毒。结果表明：（1）前期1-14d连续添加SDPP生产成绩最好，显著高于处理-（P〈0.05）。后期和全期以1-21d添加的生产性能略好，与1-14d差异不显著。（2）添加SDPP提高了肉鸡Ea、Et、脾脏指数、胸腺指数和法氏囊指数，极显著（P〈0.01）提高淋巴细胞转化率。（3）SDPP明显降低肉鸡死亡率。结果表明，在1-14d添加SDPP，可促进肉鸡生长，增强免疫功能，前期获得最佳ADG的时间是饲喂1-14d。该饲喂时间肉鸡抗菌能力最强。

The experiment was conducted to investigate the effect of SDPP supplied during different stages on growth performance and immune function of broilers. 240 1-day-old Arbor Acres broilers were randomly allotted into 4 treatments with 6 replicates of 10 broilers each （5 females and 5 males）. Treatments consisted of the group fed basal diet and groups fed diets containing 2.5% SDPP from 1-7 d, the second weekend and the third weekend, respec-tively. Then all of the four treatments were replaced by the same basal diet. On the 22ed,eight chickens with proximal average body weight （M：F=1：1） selected from every treatment were enforced peritoneal injection with Escherichia, coli O2, respectively. The results showed that： （1）the group fed the diet with SDPP lasted 14 d had the best performance and was significantly better than the control（P〈0.05） ,the group fed the diet with SDPP from 1 to 21 d had a better performance during later stage and holo-stage, but had no significant difference compared with the group fed the diet with SDPP lasted 14d; （2） SDPP increased Ea,Et and immune organs index,and the lymphocyte proliferation response was significantly increased（P〈0.01）;（3） SDPP obviously decreased mortality of the broilers. It is concluded that fed the diet with SDPP from 1 to 14 d has an auxoaction on performance and immune function of broiler. The optimal last time of feeding SDPP during the early stage is 14 d to get the best ADG and antibiotic ability.