Growth performance and immune response of two commercial broiler strains fed diets containing Lactobacillus cultures and oxytetracycline under heat stress conditions
Growth performance and immune response of two commercial broiler strains fed diets containing Lactobacillus cultures and oxytetracycline under heat stress conditions
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DOI：
10.1080/713654979
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发表时间：
2000-12-01
影响因子：
2
通讯作者：
Ho, YW
中科院分区：
文献类型：
--
作者：
Zulkifli, I;Abdullah, N;Ho, YW
1.从第（d）21天至第42.2天，将给予50 mg/kg土霉素（OTC）或1 g/kg乳杆菌培养物（LC）的膳食补充剂的Hubbard x Hubbard（HH）和Shaver x Shaver（SS）雏鸡暴露于36 +/-1 ℃，每天3小时。在热处理之前，OTC和LC鸡的体重（d 21）和增重（d 1至d 21）均大于饲喂对照饲料的鸡。鸡LC有最好的食物效率其次是OTC和控制鸟类在第1天至第21天。HH鸡的体重（d1和d21）和增重（d1 ~ d21）均高于SS鸡.热暴露3周后，与OTC和对照鸡相比，接受LC饮食的鸡具有更大的体重和体重增加，更高的食物摄入量和更低的食物效率.第21天抗纽卡斯尔疫苗抗体的产生不受菌株或饲料的影响。在第42天，虽然日粮对SS肉鸡的这一变量的影响可以忽略不计，但饲喂LC的HH鸡的抗体产量高于对照日粮。菌株和饲料对死亡率均无显著影响。
1. Hubbard x Hubbard (HH) and Shaver x Shaver (SS) chicks given a dietary supplement of either 50 mg/kg oxytetracycline (OTC) or 1 g/kg Lactobacillus culture (LC) were exposed to 36 +/- 1 degrees C for 3 h daily from day (d) 21 to 42.2. Prior to heat treatment, body weight (d 21) and weight gain (d 1 to d 21) of OTC and LC birds were greater than those fed the control diet. Chicks given LC had the best food efficiency followed by OTC and control birds during d 1 to d 21. Body weight (d 1 and d 21) and weight gain (d 1 to d 21) were greater for HH than SS chicks.3. After 3 weeks of heat exposure, birds receiving the LC diet had greater body weight and weight gain, higher food intake and lower food efficiency than OTC and control chicks.4. Antibody production against Newcastle disease vaccine on d 21 was not affected by strain or diet. On d 42, while diet had negligible effect on this variable among the SS broilers, HH birds fed LC had higher antibody production than those on the control diet.5. Neither strain nor diet had a significant effect on mortality.