在热应激条件下，两种商用肉鸡品系饲喂含有乳酸菌培养物和土霉素的日粮后的生长性能和免疫反应。

Growth performance and immune response of two commercial broiler strains fed diets containing Lactobacillus cultures and oxytetracycline under heat stress conditions.

Zulkifli I, Abdulllah N, Azrin N M, Ho Y W

Department of Animal Science, Universiti Putra, Malaysia, Selangor.

Br Poult Sci. 2000 Dec;41(5):593-7. doi: 10.1080/713654979.

Abstract

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 tlhan 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 discase 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.

摘要

给哈伯德×哈伯德（HH）和沙弗×沙弗（SS）品系的雏鸡饲喂50毫克/千克土霉素（OTC）或1克/千克乳酸菌培养物（LC）的膳食补充剂，从第21天至第42天每天在36±1摄氏度环境下暴露3小时。2. 在热处理前，OTC和LC组雏鸡的体重（第21天）和体重增加量（第1天至第21天）高于饲喂对照日粮的雏鸡。在第1天至第21天期间，给予LC的雏鸡饲料效率最佳，其次是OTC组和对照组雏鸡。HH品系雏鸡的体重（第1天和第21天）和体重增加量（第1天至第21天）高于SS品系雏鸡。3. 热暴露3周后，接受LC日粮的雏鸡比OTC组和对照组雏鸡体重更大、体重增加量更多、采食量更高但饲料效率更低。4. 第21天针对新城疫疫苗的抗体产生不受品系或日粮的影响。在第42天，虽然日粮对SS品系肉鸡的这一变量影响可忽略不计，但饲喂LC的HH品系雏鸡比饲喂对照日粮的雏鸡抗体产生更高。5. 品系和日粮对死亡率均无显著影响。