Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
권호 표지

Ovarian Structure and Hormonal Changes, and Conception Rate after Estrus Induction using $PGF_{2{\alpha}}$ in Korean Native Cows

한우에서 $PGF_{2{\alpha}}$ 투여에 의한 발정유도 후 난소 구조물 및 호르몬의 변화와 수태율

  • Park, Chul-Ho (College of Veterinary Medicine, Chonnam National University) ;
  • Ryu, Jae-Sun (College of Veterinary Medicine, Chonnam National University) ;
  • Yu, Dae-Jung (Liivestock Research Institute, JARES) ;
  • Park, In-Chul (School of Veterinary Medicine, Kangwon National University) ;
  • Kim, Jong-Taek (School of Veterinary Medicine, Kangwon 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 : 2012.08.16
  • Accepted : 2012.08.30
  • Published : 2012.09.30
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Abstract

This study was carried out to develop the useful inducing method of estrus for Korean native cows. Under the condition of estrus induction by administering $PGF_{2{\alpha}}$ for the cows in which corpus luteum (CL) in ovaries was detected by ultrasonography, ovarian responses and the changes of progesterone ($P_4$) concentration against $PGF_{2{\alpha}}$ compared with conception rate were observed in cows and heifers. In inducing estrus administering $PGF_{2{\alpha}}$. to the cows which has corpus luteum in ovaries, ovarian reponses, the changes of progesterone concentration, and conception rate were identified and compared. The results attained from the studies were as follows. Significant decreases of CL in size over time after $PGF_{2{\alpha}}$ administration were detected in both cow and heifer groups (p<0.001), but not different between groups in the CL regression rate (p>0.05). In addition, the percentage changes relative to the plasma $P_4$ concentration on day 1 after $PGF_{2{\alpha}}$ treatment were decreased to below 1ng/ml. The growth rate of follicle was observed as 31% on day 1 and 42% on day 2 in cows, and 34% on day 1 and 97% on day 2 in heifers, resulting that growth of heifers are faster than that of cows (p<0.05). The conception rate after $PGF_{2{\alpha}}$ treatment were 60.5% and 64.2% in cows and heifers, respectively. It also indicated that the conception rate after estrus observation with $PGF_{2{\alpha}}$ injection was as high as 66.6% while that with timed-artificial insemination (TAI) regardless of the estrus observation was 56%, which means the pregnancy rate of artificial insemination after estrus observation was higher than that of TAI (p<0.05). In the result of all above, there were significant decreases in CL size and the plasma $P_4$ concentration by days but rapid growth in follicles, which has no differences in cows and heifers. The conception rate was commonly high after estrus observation and more than 50% under TAI.

Keywords

References

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