Effects of Dietary Iodine and Selenium on the Activities of Blood Lymphocytes in Laying Hens

  • Song, Zhigang (State Key Laboratory for Animal Nutrition, College of Animal Science and Technology, China Agricultural University) ;
  • Guo, Yuming (State Key Laboratory for Animal Nutrition, College of Animal Science and Technology, China Agricultural University) ;
  • Yuan, Jianmin (State Key Laboratory for Animal Nutrition, College of Animal Science and Technology, China Agricultural University)
  • 투고 : 2005.02.15
  • 심사 : 2005.12.07
  • 발행 : 2006.05.01


The effect of dietary iodine and selenium supplementation, alone or in combination, on peripheral blood lymphocyte function was determined in laying hens. Eight-hundred-and-sixty-four New-Loman laying hens were randomly allotted into 12 dietary treatments with different inclusion levels of iodine (0, 0.1 and 0.2 mg/kg), selenium (0, 0.05, 0.1 and 0.2 mg/kg) or their combinations for 24 weeks. The lipopolysaccharide (LPS) stimulation index, concanavalin A (ConA) stimulation index, peroxide enzyme activity and phagocytosis to neutral red particles were tested. There were significant differences in LPS stimulation index, ConA stimulation index, peroxide enzyme activity and phagocytosis to neutral red particles in different iodine or selenium supplementation levels (p<0.05). The highest iodine and selenium supplementation both resulted in highest LPS-/ConA-stimulation indices (p<0.05). However, when iodine was lower than 0.2 mg/kg, the additional effect of different levels of selenium did not always result in significant differences in these indices. The results indicated that iodine and selenium may affect immunity in laying hens and, when the iodine level in the laying hen is lower than 0.2 mg/kg, a selenium allowance higher than 0.1 mg/kg may be necessary to improve immunity.


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