Sexed semen is commonly used for the production of calves of the desired gender. Gender selection is important in animal production industries. For example, female cattle are required for the dairy industry while males are preferred in the beef cattle industry. The present study was to assess the in vivo embryo production efficiency using the semen separated according to sex during superovulation in Hanwoo. Seventy Hanwoo donor cows were flushed on day 7 of estrus cycle with same FSH and artificial insemination by the same technicians. Embryos were recovered on 7 days after the third insemination by flushing the uterus with embryo collection medium. KPN semen straws used artificial insemination contained 20 million sperm (total number 60 million per donor). Sex-sorted semen straws contained 4 million sperm (total number 12 million per donor). The results obtained were as follows: No differences were observed in the efficiency of superovulation rates on KPN semen 87%, and sexed semen 100%, respectively. The mean numbers of total embryos are each 12.58±8.31 and 13.25±7.86. The mean numbers of transferable embryos, sexed semen were significantly lower than KPN semen (3.75±1.98 vs. 8.23±6.07, P＜0.05). The rates of unfertilized embryos from superovulation using sexed semen were significantly higher than KPN semen (50% vs. 15%, P＜0.05). The rate of degenerated 2-cell embryos from sexed and KPN semen was 60.87% and 11.11%, respectively (p＜0.05). In conclusion, these results indicate that superovulation using sexed semen was useful, but efficient embryo production was important to reducing the damage caused by the Flowcytometer-based sperm sorting procedure.

The objective of this study was to investigate the effects of abnormal ovarian cycles after superovulation treatment of Holstein Donor Cows. CIDRs were inserted into the vaginas of twenty two head of Holstein cows, regardless of estrous cycle. Superovulation was induced using folliclar stimulating hormone (FSH). For artificial insemination, donor cows were injected with PGF2α and estrus was checked about 48 hours after the injection. Then they were treated with 4 straws of semen 3 times, with 12-hour intervals. Embryos were collected by a non-surgical method 7 days after the first artificial insemination. The cows were considered to have resumed ovarian cyclicity on the day of ovulation if followed by regular ovarian cycles. Seventy two point seven percentage of the cows(16/22) had normal resumption of ovarian cyclicity(resumption within 40 days after superovulation), and 27.3%(6/22) had delayed resumption(resumption did not occur until＞40 days after superovulation). Delayed resumption Type Ⅱ(first ovulation did not occur until ≥40 days after superovulation, i.e. delayed first ovulation 13.6%) were the most common types of delayed resumptions. The mean numbers of total ova from < 10 and 10≤ of corpora lutea(CL) was 7.8±1.8 and 12.7±2.7, respectively. The number of transferable embryos differed between < 10 and 10≤ CL was 5.4±1.3 and 8.1±3.4, respectively. Four point five percentage of the cows(1/22) did not resumption their ovarian cyclicity until 60 days after superovulation treatment. Diverse researches on the superovulation treatment method that is suitable for high-producing Holstein donor cows would contribute to preventing ovarian cyclicity disorder, as well as to the early multiplication of cows with superior genes by increasing the utilization value of donor cows.

The objective of this study was to investigate the comparison of transferable embryos and pregnancy rate between Hanwoo and Chickso. The results obtained were as follows: No differences were observed in the efficiency of superovulation rates on Hanwoo 78%, and Chickso 85%, respectively. The mean number of total embryos are each 14.76± 2.16 and 6.23±1.07. So the mean number of transferable embryos are each 10.94±1.91 and 4.58±1.05. In addition, the mean number of total Hanwoo embryo from <10 and 10≤ of corpora luteum was 0.50±0.50, 11.56±1.92, respectively. In case of Chickso, The mean number of transferable embryo from <10 and 10≤ of CL was 2.75±1.39, 6.00±1.00, respectively. The pregnancy rates were Hanwoo 40%, and Chickso 37% following transfer of fresh embryos produced in vivo. Also, the pregnancy rates of Chickso 60% were significantly greater (p<0.05) than the Hanwoo 42.48% following transfer of following transfer of frozen embryos, respectively. In conclusion, these results suggest that Chickso may be effectively used for transferable embryos production in Hanwoo. Although the transferable embryos number was not enough, it seems the Chickso greatly affect pregnancy rate. The results indicated that the possibility of transferable embryos from Chickso for embryo transfer could be confirmed in this study. Based on the present findings, it was suggested that it is very important to evaluate in vivo embryo production and pregnancy rate of embryo transfer following superovulation for effective Hanwoo and Chickso production.

발정주기와 상관없이 CIDR을 삽입하는 날에 50 mg progesterone, 2.5 mg estradiol benzoate를 근육주사하였다. CIDR 삽입 후 4, 5일에 28 AU FSH (Antorin R10)을 4일 동안 감량법으로 주사하였다. 6, 7회 FSH 주사 후 25 mg, 15 mg 를 각각 주사한 다음, CIDR는 7회 FSH 주사 후 제거하였다. 1회째 주사 후 48시간에 GnRH를 주사하였다. 공란우는 발정확인 후 12시간 간격

본 연구는 효율적인 재래 산양의 난포란을 확보하기 위하여 미성숙 산양에 과배란 처리를 실시하여 체내 성숙 난자(배란된 난자) 및 난포란을 회수하여 공란산양의 성숙 여부가 난자의 회수율과 단위 발생란의 체외발달율에 미치는 영향을 조사하였다. 미성숙 산양의 과배란 처리에 의한 체내 성숙 난자의 회수율에 있어서 과배란 처리 후 두당 황체수는 13.16.5개로서 성숙 산양의 8.82.4개와 차이가 없었다(p<0.05). 산양의 두당 회수율은 마성숙 산양이 9.

The objective of this study was investigate the superovulation treatment and to relate concentrations of blood urea nitrogen(BUN) in Hanwoo donors. Thirty six, at random stages of the estrous cycle, received a CIDR. Four days later, the animals were superovulated with a total of 28AU FSH (Antorin, 2AU=1 ml) administered twice daily in constant doses over 4 days. On the 3th administration of FSH, CIDR was withdrawn and 25 mg PGF2α was administered. Cows were artificially inseminated twice after estrous detection at 12 hr intervals. The cows received 100 μg GnRH at the time of 1st insemination. Embryos were recovered 7 or 8 days after the 1st insemination. Cows with BUN ＜10, 11～18 and ≥19 mg/dl had return of estrus of 34.6, 30.5 and 30.4 days respectively. Return of estrus after superovulation treatment was not significantly lower for cows with blood urea nitrogen (BUN) above 10 mg/dl than for cows with BUN below 10 mg/dl. Cows with BUN ＜10, 11～18 and ≥19 mg/dl had number of transferable embryos of 3.2±1.2, 5.4±1.9 and 4.1±2.1 respectively.

The objective of this study was to investigate the effects of abnormal ovarian cycles after superovulation treatment of Hanwoo donors. Thirty six, at random stages of the estrous cycle, received a CIDR. Four days later, the animals were superovulated with a total of 28AU FSH (Antorin, 2AU=1 ml) administered twice daily in constant doses over 4 days. On the 3th administration of FSH, CIDR was withdrawn and 25 mg was administered. Cows were artificially inseminated twice after estrous detection at 12 hr intervals. The cows received GnRH at the time of Ind insemination. Embryos were recovered 7 or 8 days after the 1st insemination. The cows were considered to have resumed ovarian cyclicity on the day of ovulation if followed by regular ovarian cycles. 50.0 percentage of the cows (18/36) had normal resumption of ovarian cyclicity (resumption within 40 days after superovulation), and 50.0% (18/36) had delayed resumption(resumption did not occur until>40 days after superovulation). Delayed resumption Type II (first ovulation did not occur until 40 days after superovulation, i.e. delayed first ovulation 33.3%) were the most common types of delayed resumptions. The mean numbers of total ova from < 10 and 10 of corpora lutea (CL) was 7.3 and 13.9, respectively. The number of transferable embryos differed between < 10 and 10 CL was 4.2 and 5.1, respectively. 11.1 percentage of the cows (4/36) did not resumption their ovarian cyclicity until 60 days after superovulation treatment.

This study was performed to investigate the possibility of repeated superovulation treatment at interval from 27 days to 41 days in Hanwoo cattle and to compare with superovulation effect between doses of FSH 200 mg and FSH 400 mg. Different doses of FSH (200 mg or 400 mg) were injected at Day 8 after controlled internal drug release (CIDR) treatment for superovulation of Hanwoo donors following CIDR treatment (Day 8 after the estrus). Superovulation was repeated four times for one donor and number of corpus luteum (CL), number of embryos, number of transferable embryos and pregnancy rate after embryo transfer (ET) were investigated. 5 cows were used for each FSH treatment (10 cows in total). Average number of CL were and for the donors treated with FSH 200mg and FSH 400mg, respectively. Average number of embryos collected were and for the donors treated with FSH 200 mg and FSH 400 mg, respectively. Average number of transferable embryos were and for the donors treated with FSH 200 mg and FSH 400 mg, respectively. The pregnancy rate following ET with embryos collected from 200 mg FSH treated donors and 400 mg FSH treated donors were 61.9% and 53.8% respectively. The numbers of embryos tended to be decreased as the numbers of repeat of superovulation were elapsed. These results indicated that superovulation treatment by about a month to Hanwoo donors is usable and 200 mg of FSH is preferable for simple FSH treatment following CIDR treatment.

본 연구는 고능력 유우 공란우의 이용 효율을 극대화하기 위하여 체내 수정란 생산을 위한 다배란 처리의 결과에 미치는 요인을 분석하여 안정적이고 효율적인 다배란 처리 방법을 제시하기 위한 목적으로 실시하였다. 공란우의 다배란 처리는 발정 주기 일째 POLLTROPIN-V(Vetrepharm, Canada) 400mg NIH-FSH-P를 4일간 12시간 간격으로 감량법에 따라서 주사를 하였다. 호르몬 주사 6, 7회 째 황체 융해 및 발정 유도를 위하여 (

본 실험은 polyethylene glycol (PEG)에 용해시킨 FSH의 투여 방법과 용량에 따른 체내 수정란 생산 효율을 난소 반응과 회수되는 수정란의 수량과 품질, 수정란 이식 효율을 조사하였다. 공란우 88마리를 네 군으로 구분하였다. 처리 1군은 50 mg의 FSH를 하루 2회 4일 동안 투여하였으며, 처리 2 및 3군은 30% PEG 에 녹인 400 mg과 200 mg의 FSH 용량을 1회 투여하였으며, 처리 4군은 CIDR로 처리 후 7일째에 30% PEG에 녹인 200 mg의 FSH를 처리하였다. 과배란 처리 후 황체수에서는 처리 1, 2, 3 및 4군에서 각각 11.2, 18.5, 13.1 및 13.9개로서, 처리 2군에서 다른 처리군보다 유의적으로(p<0.05) 높았다. 회수된 난자의 총 수에서 각 군의 결과는 8.5, 10.4, 8.7 및 7.9개였으며, 이식 가능한 수정란 수에서 각 군의 결과는 3.9, 4.3, 4.7 및 3.7개로 군간의 유의적인 차이는 보이지 않았다. 각 과배란 처리 방법에 따라 생산된 수정란의 이식 후 수태율 (36.0～50.0%) 및 채란시 혈중 progesterone 농도 또한 군간의 유의적인 차이는 보이지 않았다. 결론적으로 공란우에 스트레스를 적게 주며 과배란 처리 호르몬 비용과 노동력을 줄일 수 있으며, 여러 마리의 공란우를 발정 주기에 상관없이 한 번에 과배란 처리를 할 수 있는 CIDR를 사용 후 7일째 200 mg의 FSH를 1회 투여 방법이 축산 현장에서 적용하기에 매우 유용한 방법이라 사료된다.

본 연구는 젖소에 있어서 다량의 수정란을 생산하여, 고능력의 유전인자를 조기에 확산할 수 있도록, 젖소에 있어서 PEG를 이용하여 과배란 처리기법 확립을 위해 실시하였으며, 그 결과는 다음과 같다. 1. 성선자극호르몬의 처리 방법에 따른 황체반응은 Folltropin 단독처리시 , Folltropin+EB는 , Folltropin+PEG는 로 나타났으며, 유의적인 차이를 보였다(p<0.01). 2. 성선자극호르몬의 처리 방법에 따른 이식 가능 수정란 수

본 연구는 한우를 공란우로 이용시 효율을 최대화하고, 과도한 호르몬의 투여를 억제하며, 그로 인하여 공란우의 경제수명을 연장하고자 과배란 처리시 차기 발정을 고려하지 않고 과배란을 유도하였을때 공란우의 반응과 수정란의 생산율을 조사하였으며, 그 결과는 다음과 같다. 1. 한우 경산우 및 미경산우를 자연발정을 확인하고 차기발정 5일전에 FSH를 1일 2회 4일 간 투여한 것과 발정을 확인하지 않고 CIDR를 이용하여 동일한 호르몬을 방법으로 과배란을 처리