Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effects of Olaquindox and Cyadox on Immunity of Piglets Orally Inoculated with Escherichia coli

  • Ding, Mingxing (National Reference Laboratory for the Test of Veterinary Drug Residues and MOA Key Laboratory of Food Safety Evaluation, Huazhong Agricultural University) ;
  • Yuan, Zonghui (National Reference Laboratory for the Test of Veterinary Drug Residues and MOA Key Laboratory of Food Safety Evaluation, Huazhong Agricultural University) ;
  • Wang, Yulian (National Reference Laboratory for the Test of Veterinary Drug Residues and MOA Key Laboratory of Food Safety Evaluation, Huazhong Agricultural University) ;
  • Zhu, Huiling (National Reference Laboratory for the Test of Veterinary Drug Residues and MOA Key Laboratory of Food Safety Evaluation, Huazhong Agricultural University) ;
  • Fan, Shengxian (National Reference Laboratory for the Test of Veterinary Drug Residues and MOA Key Laboratory of Food Safety Evaluation, Huazhong Agricultural University)
  • Received : 2004.11.04
  • Accepted : 2005.03.11
  • Published : 2005.09.01
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Abstract

A 2${\times}$3 factorial arrangement of treatments was used to determine the effects of olaquindox and cyadox on immune response of Landrace${\times}$Large-White geld piglets that had been orally given 10$^{10}$ CFU of Escherichia coli (E. coli, O$_{139}$:K$_{88}$). Factors included (1) E. coli inoculation or control, and (2) no antimicrobials, 100 mg/kg olaquindox and 100 mg/kg cyadox in the basal diet respectively. E. coli inoculums were orally administered 7 days after the diets were supplemented with olaquindox and cyadox. The effects of the two antimicrobials were assessed in terms of: (1) average daily gain (ADG), (2) systemic immune response (the number of white blood cells and lymphocytes, leukocyte bactericidal capacity, lymphocyte proliferation response to PHA, immunoglobulin concentrations, and total serous hemolytic complement activity), and (3) intestinal mucosal immunity including the number of intraepithelial lymphocytes (IELs) and immunoglobulin A secreting cells (ASCs) in the intestinal lamina propria. E. coli inoculation reduced ADG (p<0.05) during the period of d 0 to d 14 after the challenge while the antimicrobial supplementations improved ADG (p<0.01) during the experiment. ADG in cyadox-supplemented pigs was higher (p<0.05) than that in olaquindox-supplemented pigs. The antimicrobials decreased IEL and ASC counts in the jejunum and ileum (p<0.01) while E. coli inoculation caused them to increase (p<0.01). Jejunal ASCs in the cyadox-supplemented pigs were lower (p<0.05) than those in the olaquindox-supplemented. E. coli elicited increase (p<0.05) in white blood cell counts, leukocyte bactericidal capacity, lymphocyte proliferation rate, serous IgA concentrations, and serous hemolytic complement activity. The antimicrobials decreased the measured systemic immune parameters, but not significantly (p>0.05). The data suggest that olaquindox and cyadox suppress E. coli-induced immune activation, especially intestinal mucosal immune activation, which may be involved in the observed growth promotion.

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References

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