Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
권호 표지

Timed Artificial Insemination or Embryo Transfer using CIDR, Estradiol Benzoate and Prostaglandin $F_{2{\alpha}}$ for the Rebreeding of Korean Native Donor Cattle

  • Son, Dong-Soo (Animal Genetic Resources Station, National Institute Animal Science, RDA) ;
  • Choe, Chang-Yong (Animal Genetic Resources Station, National Institute Animal Science, RDA) ;
  • Cho, Sang-Rae (Animal Genetic Resources Station, National Institute Animal Science, RDA) ;
  • Choi, Sun-Ho (Animal Genetic Resources Station, National Institute Animal Science, RDA) ;
  • Kim, Hyun-Jong (Animal Genetic Resources Station, National Institute Animal Science, RDA) ;
  • Lee, Je-In (Laboratory of Theriogenology, College of Veterinary Medicine, Chungbuk National University) ;
  • Kim, Ill-Hwa (Laboratory of Theriogenology, College of Veterinary Medicine, Chungbuk National University)
  • Published : 2008.06.30
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Abstract

This study compared the pregnancy rates of Korean native donor cattle after either a timed artificial insemination (TAI) or embryo transfer (TET) following the synchronization of ovulation using a controlled internal drug release (CIDR) device together with estradiol benzoate (EB) and prostaglandin $F_{2{\alpha}}$ ($PGF_{2{\alpha}}$). Fifty five cows and 8 heifers which had been previously used for embryo production were assigned to two treatments: (1) Thirty-two cattle received a CIDR device and 2 mg EB (Day 0), 25 mg $PGF_{2{\alpha}}$ injection at the time of CIDR removal on Day 7, and 1 mg EB injection on Day 8. All of the cattle received a TAI 30 h (Day 9) after the second EB injection (TAI group). (2) Thirty-one cattle received the same hormonal treatments as in the TAI group. The cattle with corpus luteum (CL) received a TET on Day 16 using frozen-thawed embryos (TET group). Ultrasonographic observations demonstrated that the proportion of cattle with synchronized ovulation on Day 10 and the concomitant formation of new CL on Day 13 did not differ between groups (p>0.05); the overall mean rates were 65.1 and 73.0%, respectively. The conception and pregnancy rates did not differ (p>0.05) between the TAI (12.5% and 12.5%) and TET groups (13.0% and 9.7%), respectively. We conclude that the pregnancy rate following TAI or TET in Korean native donor cattle was poor, which might be due in part to a poor synchrony of ovulation and concomitant CL formation.

Keywords

References

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