Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
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Relationship between the Conception Rate after Estrus Induction using $PGF_2{\alpha}$ and Other Parameters in Holstein Dairy Cows

젖소에서 $PGF_2{\alpha}$ 투여에 의한 발정 유도 후 수태율과 다른 인자와의 관계

  • Park, Chul-Ho (College of Veterinary Medicine, Chonnam National University) ;
  • Lim, Won-Ho (College of Veterinary Medicine, Chonnam National University) ;
  • Suh, Guk-Hyun (College of Veterinary Medicine, Chonnam National University) ;
  • Oh, Ki-Seok (College of Veterinary Medicine, Chonnam National University) ;
  • Son, Chang-Ho (College of Veterinary Medicine, Chonnam National University)
  • Received : 2010.08.10
  • Accepted : 2010.08.26
  • Published : 2010.09.30
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Abstract

The purpose of this study was to determine the relationship between conception rate and other parameters (body condition score; BCS, progesterone concentrations and follicle size) before estrus induction with $PGF_2{\alpha}$. The conception rate in cows with (2.75, 2.75 to 3.25 and 3.25), BCS regardless of AI (artificial insemination) time was 47.5, 67.5% and 48.5% at $PGF_2{\alpha}$ injection, respectively. The conception rate regardless of BCS was 59.0% in cows inseminated based on detected estrus, and 46.2% in cows inseminated at 72 to 80 hours (timed artificial insemination, TAI) after $PGF_2{\alpha}$ injection. The conception rate regardless of AI time was 43.0% in cows with low progesterone concentrations (less than 1.0 ng/ml), and 67.5% in cows with high progesterone concentrations (more than 1.0 ng/ml) at $PGF_2{\alpha}$ injection. The conception rate regardless of progesterone concentrations was 59.9% in cows inseminated based on detected estrus, and 48.1% in cows of TAI after $PGF_2{\alpha}$ injection. The conception rate regardless of AI time was 36.0% in cows with small dominant follicles (less than 5 mm), 56.0% in cows between 5 mm to 10 mm of follicle size, and 65.5% in cows with large dominant follicles (more than 10 mm) at $PGF_2{\alpha}$ injection, respectively. The conception rate regardless of follicle size was 57.3% in cows inseminated based on detected estrus, and 47.6% in cows of TAI after $PGF_2{\alpha}$ injection. These results indicated that if the cows with BCS 2.75 to 3.25, active corpus luteum, and/or large dominant follicle (more than 10 mm) are used for estrus induction, the conception rate will be greater.

Keywords

References

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