Johnson E L, Nicholoson J L, Doerr J A
Br Poult Sci. 1985 Apr;26(2):171-7. doi: 10.1080/00071668508416801.
Proprietary broiler diets, containing added copper (125 mg/kg) as sulphate, were fed to broilers in 4 trials (32 pens each) over a one year period without a change of litter. Mould counts in the litter of pens containing birds fed the standard diets decreased to 2 X 10(3) propagules per g in trial 4. Those in the pens with birds fed the diets containing supplemental copper decreased to 6 X 10(2) propagules per g. Litter bacterial counts (10(7) organisms/g) were not affected by dietary copper. Litter copper concentrations in pens where the birds were fed supplemented diets increased significantly to more than 600 mg/kg in trial 4. Dietary copper sulphate addition significantly increased broiler weight gains at 7 weeks in trials 3 and 4 (P less than 0.05) and the efficiency of food utilisation was significantly improved in trial 4. The copper content of the chicks' livers remained unchanged. It is suggested that broiler performance may be independent of dietary copper content. Litter copper concentrations and litter microbial alterations may be important factors.
在一年的时间里，将含有添加硫酸铜（125毫克/千克）的肉鸡专用日粮用于4次试验（每次试验32个鸡舍）的肉鸡喂养，垫料不更换。在试验4中，喂食标准日粮的鸡舍垫料霉菌数量降至每克2×10³个繁殖体。喂食含补充铜日粮的鸡舍垫料霉菌数量降至每克6×10²个繁殖体。垫料细菌数量（10⁷个微生物/克）不受日粮铜的影响。在试验4中，喂食补充日粮鸡舍的垫料铜浓度显著增加至600毫克/千克以上。在试验3和4中，添加日粮硫酸铜显著提高了7周龄时肉鸡的体重增加（P＜0.05），在试验4中食物利用效率显著提高。雏鸡肝脏的铜含量保持不变。有人认为，肉鸡的生产性能可能与日粮铜含量无关。垫料铜浓度和垫料微生物变化可能是重要因素。
