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The Effects of Estrogen Receptor Locus on Reproductive Tracts Components and Performance Traits in Large White×Meishan F2 Offspring

  • Li, Fenge (Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture) ;
  • Lei, Minggang (Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture) ;
  • Zheng, Rong (Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture) ;
  • Zuo, Bo (Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture) ;
  • Jiang, Siwen (Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture) ;
  • Deng, Changyan (Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture) ;
  • Xiong, Yuanzhu (Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture)
  • Received : 2003.08.25
  • Accepted : 2004.05.17
  • Published : 2004.09.01

Abstract

Previously candidate gene approach revealed estrogen receptor (ESR) locus was associated with increased litter size. In this study, PvuII polymorphisms of ESR gene was detected by PCR-RFLP, and ESR locus was evaluated for its association with reproductive tracts components in the Large $White{\times}Meishan$ ($LW{\times}M$) F2 offspring. Ninety seven gilts with reproductive tracts components records and 136 offspring with performance traits records were genotyped and the results were used to estimate allele substitution effects. The results showed that two alleles (A and B) were identified, and 121 bp fragments were observed for the AA genotype and 65 bp and 56 bp fragments for the BB genotype; the length of uterine body (LUB) of BB gilts were significantly shorter than AA gilts', the additive effect was -1.762 cm; the uterine weight (UW) of AB gilts were significantly lighter than AA gilts' with the additive effect -18.058 g; no significant associations of ESR alleles with ovulation rate (OR), length of uterine horn (LUH), length of uterine cervix (LUC), weight of two ovaries (OW), volume of uterine lumen (VUL), length of oviduct (LO) were observed. BB genotypes gilts need significantly less days to 100 kg ($D_{100kg}$) than AA genotypes (p<0.01), the additive effect was per copy of B allele. Allele B is also favorable for average daily gain (ADG), with additive effect 0.015 kg/d (p<0.05). There was no difference between genotypes for backfat thickness at the 13th rib (SF13), loin meat height (ELMH), and loin meat percentage was estimated (ELMP), individual birth weight (IBW) and teat number (TN).

Keywords

Pigs;Estrogen Receptor Gene;PvuII Locus;Female Reproductive Tract Components;Performance Traits

Acknowledgement

Supported by : Chinese Ministry of Education

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