This study was carried out to confirm the effects of luteotrophin, human chorionic gonadotrophin (hCG), and an anti-luteolytic agent, flunixin meglumin (FM), on pregnancy rates in Hanwoo with in vitro produced (IVP) embryo transfers (ET), and to research the effects on the estrus cycle. Treatments included hCG and FM administration 3~10 minutes prior to ET. Also, pregnancy rates were compared with lidocane treatment and FM treatment prior to ET. The results are shown below. 30-day pregnancy rate was 76.7% in the hCG-treated group and 75.7% in the FM-treated group. Both rates were higher than the 70% rate for the control group. 42-day pregnancy rate was 76.7% in the FM-treated group. This was higher than 66.7% recorded for both the hCG-treated and control groups. The pregnancy rate of the hCG-treated group was high at Day 30 (76.7%) but low at Day 40 (66.7%), and there were no differences from the FM-treated and control groups. The recurrent estrus rate of infertile individuals at 2 weeks after ET was 36.4% in the hCG-treated group, under 71.4% in the FM-treated group and 80.0% in the control group. The non-pregnancy rate of individuals without recurrent estrus was 18.2% in the hCG-treated group, which was higher than the 0% rate in both the FM-treated and control groups. The pregnancy rates were higher in the FM-treated group than the Lidocane-treated group with 72.3% versus 67.5% in the heifers and 48.9% versus 43.6% in the cows. From the above results, the FM treatment proved more effective than the hCG treatment and no treatment whatsoever in increasing pregnancy rates after ET. In addition, hCG treatment was shown to be undesirable due to the deviations it caused in the reproductive physiology of the hCG-treated recipients. Therefore, in our study, the FM treatment resulted in a higher pregnancy rate than either lidocaine treatment or no-treatment in the trials of ET.

본 연구는 돼지에서 스트레스 관련 HSP70 유전자의 다형성과 IVF 수정란의 배발달간의 관련성을 조사하기 위하여 수행되었으며 그 결과는 다음과 같다. HSP70-K1, -K3 및 -K4의 PCR 산물로부터 SSCP 다형성은 각각 다르게 확인되었다. 체외수정란의 분할율 시험에서 HSP70 K1-AA() 및 K1-AB() 난할율은 HSP70 K1-BB()보다 유의적으로 높게 나타났다(p<0.05). 또한 HSP70 K3-AA() and K3-AB()형도

본 연구에서는 DNA marker가 검정된 한우로부터 생산한 체외수정란을 이식하여 육질 및 육량의 유전적 능력이 우수한 한우를 대량생산하여 고품질 한우 쇠고기 생산 시스템을 구축하기 위한 전단계로서 DNA marker 검정 한우로부터 초음파유도 난포란을 채란하여 체외수성 및 수정란의 체외 발달에 미치는 각종 요인들과 배반포기 수정란의 부화율 개선을 위하여 투명대를 laser로 drilling을 실시하여 부화율을 조사하였다. 초음파유래 체외수정란의 분할률

본 연구는 고품질육의 DNA marker가 규떵된 한우로부터 초음파유노 난포란의 연속적 채취를 통하여 능력이 우수한 한우 수정란온 대량생산하는 방법의 확립과 이를 한우농가에 응용하고자 초음파 난자채취기를 이용하여 등지방층두께, 일당증체량, 근내지방도 및배최장근 단면적에 연관된 DNA marker를 보유하고 있는 한우 5두로부터 개체및 난포수, 채취방법, 회수한 난포란의 등급 등을 조사하였다. 한우 5두의 개체별 난포수는 6, 10, 5, 4 및 11회

In vitro fertilization(IVF) derived morula and blastocyst embryos were bisected by a simple method and cultured in vitro without zona pellucida And also bisected embryos were frozen-thawed and cultured in vitro) to evaluate the survival rate. The results obtained were as follows : The average number of grade I or II immature follicular oocytes recovered by slicing method per ovary was 11.9 from 142 ovaries. Following in vitro fertilization, the rates of cleavage and in vitro development to morula and blatocyst were 61.7 and 32.2% respectively. The successful bisection rate of IVE embryos was 67.51%, and the embryos of blastocyst stage were bisected successfully at significantly(P

The aims of this study are 1) to test oocytes and embryos collected from in-vivo and in-vitro to achieving the valuable protocol by culturing, vitrifying and thawing of oocytes/embryos, and 2) to transfer them to recipient, and finally have resulted in pregnancies from recipient females after surgical or nonsurgical transfer. In vitro maturation and fertilization were performed according to the procedures of Funahashi et al. Fertilized oocytes were cultured in glucose-free NCSU 23 supplemented with 5 mM sodium pyruvate, 0.5 mM sodium lactate and 4 mg/ml bovine serum albumin for 2 days at 39, and 10% fetal bovine serum was added to the culture medium thereafter. Embryos were treated with 7.5g/ml cytochalasin-B for 30 min, centrifuged at 13,000 g for 13 min and then exposed sequentially to an ethylene glycol (EG) vitrification solution, aspirated into OPSs, and plunged/thawed into/from liquid nitrogen. In vivo embryos were surgically collected from three donors after Al. Forty-six embryos (18, 9 and 19 embryos, respectively) were washed 3 times in mPBS+10%FBS, followed treatments : cultured, centrifuged, vitrified, recovered and transferred to recipients as in vitro prepared embryos. Three recipients received surgically 34(control), 188 and 184 embryos (derived from abattoir), respectively. Another three recipients were received nonsurgically 150, 100 and 150 embryos, respectively. All recipient sows exhibited delayed returns to estrus. To our knowledge, these results suggest that required an improved techniques, more vigorous embryos preparation and cleaner uterous condition(use gilt).