Liu Z, Wu X, Zhang T, Cui H, Guo J, Guo Q, Gao X, Yang F
J Anim Sci. 2016 Mar;94(3):1095-104. doi: 10.2527/jas.2015-9960.
A 75-d experiment was conducted to evaluate the influence of dietary Cu concentrations on growth performance, serum lipid profiles, antioxidant defenses, and fur quality in growing-furring male blue foxes. Seventy-five male blue foxes (5.78 ± 0.09 kg BW) were selected and randomly allocated to 1 of the following 5 dietary treatments: 1) control (basal diet without supplemental Cu; 7.78 mg Cu/kg), 2) 12.22 mg/kg supplemental Cu (Cu20), 3) 32.22 mg/kg supplemental Cu, 4) 72.22 mg/kg supplemental Cu (Cu80), and 5) 152.22 mg/kg supplemental Cu (Cu160). A dry feed that consisted of animal meals, soybean meal, extruded corn, and soybean oil was used as the basal diet and Cu was supplemented as reagent grade CuSO∙5HO. The results showed that Cu supplementation increased the ADG ( < 0.05) and fat digestibility ( < 0.01) and tended to improve G:F ( = 0.09). The ADFI, however, was not affected by dietary Cu ( > 0.10). Additionally, Cu supplementation linearly increased the concentration of fecal Cu, liver Cu, serum total protein, and albumin ( < 0.01). Foxes in the Cu160 group had higher serum Cu concentration than those in the control and Cu20 groups ( < 0.05). The concentration of serum cholesterol decreased with dietary Cu supplementation ( < 0.05). Serum high-density lipoprotein, on the contrary, tended to increase with Cu supplementation ( = 0.09). Copper supplementation increased the activity of glutathione peroxidase ( < 0.05) and tended to increase the activity of serum ceruloplasmin ( = 0.07). For fur quality, skin length in the Cu80 group was greater than that in the control and Cu20 groups. In addition, hair color tended to deepen with the increasing of dietary Cu concentrations ( = 0.08). In conclusion, this study demonstrates that Cu supplementation can promote growth and increase fat digestibility and fur length. Additionally, dietary Cu supplementation can enhance antioxidant capacity and reduce serum cholesterol in growing-furring blue foxes.
进行了一项为期75天的试验，以评估日粮铜浓度对育成期雄性蓝狐生长性能、血清脂质谱、抗氧化防御能力和毛皮质量的影响。选用75只雄性蓝狐（体重5.78±0.09千克），随机分为以下5种日粮处理组中的1组：1）对照组（不添加铜的基础日粮；7.78毫克铜/千克），2）添加12.22毫克/千克铜（Cu20），3）添加32.22毫克/千克铜，4）添加72.22毫克/千克铜（Cu80），5）添加152.22毫克/千克铜（Cu160）。以由动物蛋白、豆粕、膨化玉米和大豆油组成的干饲料作为基础日粮，铜以试剂级硫酸铜∙5H₂O的形式添加。结果表明，添加铜提高了平均日增重（P<0.05）和脂肪消化率（P<0.01），并倾向于改善料重比（P=0.09）。然而，采食量不受日粮铜的影响（P>0.10）。此外，添加铜使粪便铜、肝脏铜、血清总蛋白和白蛋白浓度呈线性增加（P<0.01）。Cu160组蓝狐的血清铜浓度高于对照组和Cu20组（P<0.05）。日粮添加铜使血清胆固醇浓度降低（P<0.05）。相反，血清高密度脂蛋白随铜添加量增加有升高趋势（P=0.09）。添加铜提高了谷胱甘肽过氧化物酶的活性（P<0.05），并使血清铜蓝蛋白活性有增加趋势（P=0.07）。对于毛皮质量，Cu80组的皮长大于对照组和Cu20组。此外，毛色随日粮铜浓度升高有加深趋势（P=0.08）。总之，本研究表明，添加铜可促进生长，提高脂肪消化率和毛皮长度。此外，日粮添加铜可增强育成期蓝狐的抗氧化能力并降低血清胆固醇。
