ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2017, Vol. 48 ›› Issue (9): 1674-1682.doi: 10.11843/j.issn.0366-6964.2017.09.012

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Association Analysis between IL6 Gene Intron 3 Polymorphism and Piglet Diarrhea, Growth and Boar Reproduction Traits

ZHA An-dong1, XING Gui-ling1, GAO Xiao-wen1, ZHANG Long2, DI Sheng-wei1, WANG Xi-biao1, NIU Bu-yue1*   

  1. 1. College of Animal Science and Technology/College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China;
    2. College of Animal Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
  • Received:2017-05-11 Online:2017-09-23 Published:2017-09-23

Abstract:

In order to discover new molecular marker related to piglet diarrhea, growth and boar reproduction traits, the polymorphism of porcine IL6 gene was investigated and the association analysis was performed in different pig breeds. The DNA fragment of IL6 gene was amplified and sequenced. A SNP (g.1704674C>T), which could alter the recognition site of HpaⅡ, was detected in intron 3 of IL6. The SNP was genotyped by PCR-RFLP in 281 Min piglets, 182 Landrace piglets, 215 Duroc boars and 69 Yorkshire boars. Its association with piglet diarrhea, growth and boar reproduction traits was analyzed. The expression of IL6 was detected in PBMC stimulated with LPS by real-time PCR. The results showed that Min piglets with CC genotype had significantly higher diarrhea index than TT genotype piglets (P<0.05). The 14, 21, 28, 35-day body weight and ADG of Min piglets with CC genotype were significantly lower than that of TC genotype (P<0.05), and the 21-day body weight of Min piglets was also significantly lower than that of piglets with TT genotype (P<0.05). In Landrace piglets, birth weight of piglets with TT genotype was significantly higher than that of piglets with CC genotype (P<0.05), and the 7-day body weight was significantly higher than that of individuals with TC genotype (P<0.05). In Duroc boars, the ejaculate volume of boars with TT and TC genotype was significantly higher than that of boars with CC genotype (P<0.05). In Yorkshire boar, the sperm density of boars with CC genotype was significantly higher than that of boars with TC genotype (P<0.05). At 12 and 24 h after LPS stimulation, the expression of IL6 gene was significantly increased in PBMC (P<0.01 or P<0.05). Therefore, it can be concluded IL6 g.1704674C> T had effect on piglet diarrhea, growth and boar reproduction traits, and which may be a potential molecular marker in pig breeding.

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