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Production and evaluation of PRRS resistant pigs

PRRS 저항성 유전형 자돈의 생산 및 평가

  • Jeong, Chang-Gi (College of Veterinary Medicine, Chonbuk National University) ;
  • Khatun, Amina (College of Veterinary Medicine, Chonbuk National University) ;
  • Nazki, Salik (College of Veterinary Medicine, Chonbuk National University) ;
  • Lee, Sim-In (College of Veterinary Medicine, Chonbuk National University) ;
  • Kim, Tae-Hun (National Institute of Animal Science, Rural Development Administration) ;
  • Kim, Kwan-Suk (College of Agriculture, Life & Environment Sciences, Department of Animal Science, Chungbuk National University) ;
  • Park, Choi-Kyu (College of Veterinary Medicine, Kyoungpook National University) ;
  • Kim, Won-Il (College of Veterinary Medicine, Chonbuk National University)
  • Received : 2018.09.17
  • Accepted : 2018.12.31
  • Published : 2019.03.30

Abstract

Porcine reproductive and respiratory syndrome (PRRS) is economically the most important and challenging disease in swine industries worldwide and caused by PRRS virus (PRRSV). Previous studies reported that pigs with heterozygous genotypes in the guanylate-binding proteins (GBP1 and GBP5) exhibited increased resistance against PRRSV infection. The present study was conducted to produce higher numbers of the heterozygous pigs based on the PRRS resistant polymorphisms found in GBP1 (GBP1E2 and WUR) and GBP5, and evaluate the resistance of heterozygous pigs against challenge with a type 2 PRRSV (JA142) in comparison with homozygous pigs. In the challenge study, 12, 4 week-old PRRSV-negative piglets were selected based on the genotypes of the 3 polymorphisms (GBP1E2, WUR and GBP5). Among them, 8 piglets [homozygous (n=4) and heterozygous (n=4)] were challenged with JA142 and kept in the same room, and the remaining 4 piglets were kept separately as a negative control. In results, the sperms collected from the boars of GBP1E2-GG genotype produced approximately 28~41% higher numbers of heterozygous piglets as compared with those from the boars of GBP1E2-AG genotype. In the challenge study, we found that heterozygous piglets showed the significantly lower levels of viremia than homozygous piglets at 14, 21 and 28 dpc. Consistently, these heterozygous piglets also exhibited significantly higher ADWG than homozygous piglets. Therefore, in the current study, selection of boars based on SNP markers could increase the production of PRRS resistant piglets and the PRRS resistant pigs were found to be more resistant to PRRSV infection.

Keywords

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Fig. 1. Viremia and average daily weight gain (ADWG) after challenge with PRRSV.

Table 1. The information of primers and probes used for genotyping

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Table 2. The genotyping results on sperm samples from DH farm

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Table 3. Genotyping results of piglets produced with GBP1E2-AG sperms

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Table 4. Genotyping results of piglets produced with GBP1E2-GG sperms

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