热应激对实验性大肠杆菌病肉鸡生产性能的影响

Effects of heat stress on production efficiency in broiler chickens with experimental colibacillosis

对37℃持续热应激对实验性大肠杆菌病肉鸡生产性能的影响进行了研究，结果表明，热应激和大肠杆菌感染均可显著降低（P〈0．01）肉鸡的采食量。热应激4～7d感染肉鸡的采食量平均下降了26．01%（P〈0．01）。热应激显著降低肉鸡的增重（P〈0．01），大肠杆菌感染使肉鸡体重显著下降（P〈0．01）。热应激7d，感染肉鸡体重下降了348．58％。说明热应激显著降低感染肉鸡的采食量，严重影响感染肉鸡的生产性能。

The experiment was designed to investigate effects of 37℃ constant heat stress on production efficiency in broiler chickens with experimental colibacillosis and to give the theoretics basis for breeding broiler chickens with colibacillsis under high temperature. The results showed that： the heat stress and colibacillosis in broiler chickens all decreased significantly （P 〈 0.01） in feed intake. The feed intake of broiler chickens with colibacillsis decreased by 26.01% （P 〈 0.01 ） from 4 to 7 day under heat stress. The heat stress decreased significantly （P〈 0.01 ） in body weight gain of broiler chickers. The body weight of broiler chickens with colibacillosis decreased significantly （P 〈 0.01 ）. The body weight in broiler chickens with colibacillosis decreased by 348.58 % in 7 days under heat stress. The conclusion： The heat stress decreased significantly in feed intake of broiler chickens with colibacillosis and severely affected its production efficiency.