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Articles by Ke-Ying Zhang
Total Records ( 2 ) for Ke-Ying Zhang
  Zhang Xiang-Qi , Ke-Ying Zhang , Xue-Mei Ding and Shi-Ping Bai
  The experiment was conducted to compare the effects of dietary Tribasic Copper Chloride (TBCC) and Copper Sulfate (CuSO4) on carcass characteristics, copper deposition and tissular nutrients oxidation in broilers. A 2x5 factorial (two copper sources: CuSO4 or TBCC; five added copper levels as 0, 50, 150, 250 or 350 mg/kg) completely randomized design was conducted in experiment. 1,890, 1 day old, Cobb 48 commercial male chicks were randomly allotted into 63 floor pens of 30 birds each and fed to 40-days-old. Two birds from each pen were sacrificed. Their carcass characteristics and the contents of crude fat, copper, VE or Malondialdehyde (MDA) in tissues were determined. Results indicated that: when added copper level was 150 mg/kg, half-evisceration yield and breast yield of broilers increased. The evisceration yield of broilers was raised by feeding TBCC and supplementation with 50 mg/kg copper from TBCC got the biggest evisceration yield; when added copper levels increased from 50-350 mg/kg, contents of copper or crude fat in liver or muscles and the level of VE in heart were increased significantly, while, the levels of VE or MDA in liver decreased; when added copper levels were less than or equal to 150 mg/kg, the copper levels in liver or muscles were similar between copper sources; while added copper levels were >150 mg/kg, the smaller quantities of copper in liver were gained by using TBCC comparing with feeding CuSO4. It implicated that TBCC was a safe dietary copper source.
  Hong Chen , Ke-Ying Zhang , Xue-Mei Ding , Zhi-Wen Xu , Dai-Wen Chen and Gang Tian
  Sixteen crossbred barrows (Duroc X Landrace X Yorkshire) weaned at 28 days with an initial body weight of 5.12-8.64 kg and no antibodies to PCV2 were used in a 5-week trial to evaluate the immune response after intranasal inoculation with type-2 porcine circovirus. The percentage of peripheral blood ANAE+ T cells, PCV2 antibody titer, immunoglobulins, and serum IFN-γ, IL-2, and sIL-2R levels were determined. The results show that the percentage of peripheral blood ANAE+ T cells was notably higher in inoculated pigs 5 days post-inoculation (dpi) and significantly lower 21 dpi than in the control group. The anti-PCV2 titer in the inoculated group was significantly higher than that in the control group 14 dpi. The immunoglobulin profile of the 2 groups also differed. The IFN-γ level in the inoculated group decreased significantly from 7 to 28 dpi, as compared with the control group. The results suggest that PCV2 challenge results in an immune system response.
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