Reproductive and Developmental Biology

The Korean Society of Animal Reproduction (한국동물번식학회)
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Effect of Pregnancy Rate Following Timing of Artificial Insemination after Estrus of Hanwoo Female

  • Yang, Jung Seok (Department of Animal Science and Biotechnology, Sangji Youngseo College) ;
  • Heo, Young-Tae (Department of Animal Sciences, Chungbuk National University) ;
  • Uhm, Sang Jun (Department of Animal Science and Biotechnology, Sangji Youngseo College) ;
  • Ko, Dae Hwan (Department of Animal Science and Biotechnology, Sangji Youngseo College)
  • Received : 2013.06.10
  • Accepted : 2013.06.18
  • Published : 2013.06.30
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Abstract

This study was conducted to investigate optimal time of artificial insemination (AI) to Hanwoo female after natural estrus. AI was occurred 12 and 24 hours after natural estrus in both heifer and multiparous recipient then pregnancy and parturition rates were estimated. Results indicated that AI performed at 24 hours after natural estrus showed significant (p<0.05) higher pregnancy rate in both heifer and multiparous recipient groups with significantly (p<0.05) higher abortion rate. However, there are no significant differences of parturition rate, twin birth and sex ratio in both heifer and multiparous recipient groups. Therefore, our results may suggest that performance of AI at 24 hours after natural estrus promise higher pregnancy rate than AI at 12 hours after natural estrus in both heifer and multiparous recipient.

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References

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