Conception Rate of Ovulation-Estrus Synchronization Method in Hanwoo

한우에 있어서 발정ㆍ배란 동기화법에 의한 수태율

  • Published : 2003.09.01


This objective of this experiment were to evaluate the effect of various estrus synchronization programs on estrus detection rate and pregnancy rate in Hanwoo. After Postpartum 60 Days, a total of 150 cows divided into 2 groups. Cows Group 1 were treated with one luteolytic dosage of PGF$_2$$\alpha$(25 mg, im; lutalyse. USA) on Day 0, and with a second dosage 14 d later; cows in Group 2 were treated with GnRH(l00 $\mu\textrm{g}$, im; Conceral. Korea) on Day 0, PGF$_2$$\alpha$ 7 d later, GnRH 2 d later, and then time-inseminated approximately 16 h after this second treatment with GnRH. Ovarian morphology was monitored cows by trans-rectal ultrasonography from 24 hr to 32 hrs after second GnRH injection. The result obtained summarized as follows: 1. Cows synchronization of estrus with GnRH+PGF$_2$$\alpha$+GnRH(Ov-synch) and PGF$_2$$\alpha$ were 91.3 and 40.0%, respectively. 2. Induced ovulation were 24 to 32hr after the second GnRH injection, but high induced ovulation was 28hr. 3. High conception rate were 24hr insemination after the second GnRH injection. 4. Conception rate with PGF$_2$$\alpha$, CIDR and GnRH treatment were 50.0, 36.0 and 76.9%, respectively.

본 연구는 한우에 PGF$_2$$\alpha$와 GnRH+PGF$_2$$\alpha$+GnRH(Ov-synch)를 처리하여 발정 및 배란을 동기화 시켰으며, 2차 GnRH 투여후 배란시간, 2차 GnRH 투여후 시간 경과에 따른 수태율과 발정ㆍ배란 동기화법에 의한 수태율을 조사하고자 실시하였다. 시험축은 총 4개 농가에서 경산우 150두를 무작위로 선발하여 시험에 공시하였으며, 발정ㆍ배란동기화 방법에 따라 발정을 유기한 후 1회 인공수정을 실시하고 수태율에 미치는 영향을 조사하였다. 호르몬처리 방법으로는 GnRH+PCF$_2$$\alpha$+GnRH(Ov-synch)와 PGF$_2$$\alpha$를 이용한 발정동기화 방법을 사용하였다. 2차 GnRH 투여 후 배란시간을 알아보기 GnRH 투여 후 24시간 후부터 32시간까지 2시간 간격으로 초음파 Sonovet-600(Medison. Korea)를 이용하여 난소를 촬영하였다. 1. 호르몬 투여후 발정동기 화율은 PGF$_2$$\alpha$ 투여구에서 40.0%와 GnRH+PGF$_2$$\alpha$+GnRH(Ov-synch)처리구에서 91.3%로 나타났다. 2. 2차 GnRH 주사후 24시간에 배란이 시작되어 32시간에 배란이 종료되었으며, 배란율은 28시간째에 46.6%가 배란되어 가장 높게 나타났다. 3. 2차 GnRH주사후 6∼24시간에 수정한 군이 6시간 이전과 30시간 이후에 수정시킨 군에 비해 높은 수태율을 나타냈다. 4. 호르몬 처리별 수태율은 PGF$_2$$\alpha$, CIDR 및 GnRH+PGF$_2$$\alpha$+GnRH(Ov-synch)에서 각각 50.0, 36.0와 76.9%로 GnRH+PGF$_2$$\alpha$+CnRH(Ov-synch)군에서 가장 높은 수태율을 나타냈다.


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