Kim J W, Kim J H, Shin J E, Kil D Y
Department of Animal Science and Technology, Chung-Ang University, Anseong 456-756, Republic of Korea.
Department of Animal Science and Technology, Chung-Ang University, Anseong 456-756, Republic of Korea.
Poult Sci. 2016 Jul 1;95(7):1591-1597. doi: 10.3382/ps/pew049. Epub 2016 Mar 4.
This experiment was conducted to determine the relative bioavailability (RBV) of Cu in tribasic copper chloride (TBCC) to Cu in copper sulfate (monohydrate form; CuSO4·H2O) for layer diets based on egg yolk and feather Cu concentrations. A total of 252, 72-wk-old Hy-Line Brown laying hens were allotted to 1 of 7 treatments with 6 replicates consisting of 6 hens per replicate in a completely randomized design. Hens were fed corn-soybean meal-based basal diets supplemented with 0 (basal), 100, 200, or 300 mg/kg Cu from CuSO4 or TBCC for 4 wk. Results indicated that egg production, egg weight, and egg mass were not affected by dietary treatments. However, increasing inclusion levels of Cu in diets from CuSO4 decreased (P < 0.05) feed conversion ratio (FCR), whereas increasing inclusion levels of Cu in diets from TBCC did not affect FCR, indicating significant interaction (P < 0.05). Increasing inclusion levels of Cu from TBCC or CuSO4 increased (P < 0.05) Cu concentrations of egg yolk and feathers. Feather Cu concentrations were greater (P < 0.01) for hens fed diets containing CuSO4 than for hens fed diets containing TBCC. The values for the RBV of Cu in TBCC to Cu in CuSO4 based on log10 transformed egg yolk and feather Cu concentrations were 107.4% and 69.5%, respectively. These values for the RBV of Cu in TBCC did not differ from Cu in CuSO4 (100%). The RBV measured in egg yolk did not differ from the RBV measured in feather. In conclusion, the RBV of Cu in TBCC to Cu in CuSO4 can be determined using Cu concentrations of egg yolk and feathers although the values depend largely on target tissues of laying hens. For a practical application, however, the RBV value of Cu in TBCC to Cu in CuSO4 could be 88.5% when the RBV values determined using egg yolk and feather Cu concentrations were averaged.
本试验旨在根据蛋黄和羽毛中的铜浓度，测定蛋鸡日粮中碱式氯化铜（TBCC）中铜相对于硫酸铜（一水合物形式；CuSO4·H2O）中铜的相对生物利用率（RBV）。将252只72周龄的海兰褐蛋鸡随机分为7组，每组6个重复，每个重复6只鸡，采用完全随机设计。母鸡饲喂以玉米-豆粕为基础的基础日粮，分别添加0（基础日粮）、100、200或300mg/kg硫酸铜或碱式氯化铜中的铜，持续4周。结果表明，产蛋量、蛋重和蛋品质不受日粮处理的影响。然而，日粮中硫酸铜添加水平的增加降低了（P<0.05）饲料转化率（FCR），而日粮中碱式氯化铜添加水平的增加对FCR没有影响，表明存在显著的交互作用（P<0.05）。日粮中碱式氯化铜或硫酸铜添加水平的增加提高了（P<0.05）蛋黄和羽毛中的铜浓度。饲喂含硫酸铜日粮的母鸡羽毛铜浓度高于（P<0.01）饲喂含碱式氯化铜日粮的母鸡。基于log10转换后的蛋黄和羽毛铜浓度，碱式氯化铜中铜相对于硫酸铜中铜的RBV值分别为107.4%和69.5%。碱式氯化铜中铜的RBV值与硫酸铜中铜的RBV值（100%）没有差异。蛋黄中测得的RBV与羽毛中测得的RBV没有差异。总之，尽管碱式氯化铜中铜相对于硫酸铜中铜的RBV值很大程度上取决于蛋鸡的目标组织，但可以使用蛋黄和羽毛中的铜浓度来测定。然而，在实际应用中，当使用蛋黄和羽毛铜浓度测定的RBV值进行平均时，碱式氯化铜中铜相对于硫酸铜中铜的RBV值可能为88.5%。
