The current experiment was carried out to evaluate the effect of different dietary chromium supplementation sources, chromium oxide (Cr₂O₃), chromium methionine (Cr‐Met), or chromium yeast (Cr‐yeast), at different levels each (500 or 1,000 ppb) on growth performance, physiological traits, and carcass characteristics of broiler chicks. A total of 490 seven‐day‐old Arbor Acres chicks were randomly distributed into 7 experimental groups each in 10 replicates of 7 birds each. The groups were control, 500 ppb Cr₂O₃, 1,000 ppb Cr₂O₃, 500 ppb Cr‐Met, 1,000 ppb Cr‐Met, 500 ppb Cr‐yeast, and 1,000 ppb Cr‐yeast. The results showed significant superiority of the organic chromium sources (Cr‐Met or Cr‐yeast) concerning body weight and weight gain, the group supplemented with 1,000 ppb Cr‐yeast consumed the lowest feed (3,185 g) and had the best feed conversion ratio (1.60) compared to the control (1.73). The chromium treatments recorded significantly better protein and lipid profile, antioxidant status, and immunological parameters than the control group. Similarly, dietary chromium supplementation increased carcass yield and decreased intestinal pathogenic bacteria. In conclusion, supplementing broiler diets with organic chromium sources at 1,000 ppb promotes growth performance, physiological traits, and carcass characteristics; such chromium treatments enhanced the antioxidant status and immunity levels of broilers.

中文翻译：

---

日粮中不同来源和水平的铬补充剂对肉鸡生长性能的影响。

目前的实验旨在评估不同膳食铬补充来源、氧化铬 (Cr ₂ O ₃ )、蛋氨酸铬 (Cr-Met) 或铬酵母 (Cr-yeast) 的影响，每种来源的添加量各不相同（500 或1,000 ppb）对肉鸡生长性能、生理特性和胴体特性的影响。将总共​​ 490 只 7 日龄的 Arbor Acres 小鸡随机分配到 7 个实验组，每个实验组 10 个重复，每个重复 7 只。这些组是对照、500 ppb Cr ₂ O ₃、1,000 ppb Cr ₂ O ₃、500 ppb Cr-Met、1,000 ppb Cr-Met、500 ppb Cr-酵母和 1,000 ppb Cr-酵母。结果表明，有机铬来源（Cr-Met 或 Cr-酵母）在体重和增重方面具有显着优势，补充 1,000 ppb Cr-酵母的组消耗的饲料最少（3,185 克），饲料转化率最高(1.60) 与对照 (1.73) 相比。与对照组相比，铬处理记录了显着更好的蛋白质和脂质谱、抗氧化状态和免疫学参数。同样，日粮中补充铬可提高胴体产量并减少肠道致病菌。总之，在肉鸡日粮中添加 1,000 ppb 的有机铬来源可促进生长性能、生理特性和胴体特性；