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한우에서 $PGF_{2{\alpha}}$ 투여 후 난포 크기 및 발달 과정에 따른 발정 증상의 발현
박철호,류재선,유대중,박인철,김종택,서국현,오기석,손창호,Park, Chul-Ho,Ryu, Jae-Sun,Yu, Dae-Jung,Park, In-Chul,Kim, Jong-Taek,Suh, Guk-Hyun,Oh, Ki-Seok,Son, Chang-Ho 한국수정란이식학회 2012 한국동물생명공학회지 Vol.27 No.3
This study was operated to establish induction using ultrasonography by estimating the relation of follicle size and estrus manifestation. Clinical estrus symptoms were observed 97.4% in cows and 87.5% in heifers when overall 55 cows were induced to estrus in a single dose of $PGF_{2{\alpha}}$ after verifying CL through ultrasonography, which means estrus hours among those 52 cows showing the clinical estrus symptoms were estimated 2.39 days on cows and for 2.37 days on heifers which showed no differences (p>0.05). The estrus manifestation hours according to the follicle size in cows didn't have any significance each other (p>0.05), though estrus hours was 54 hours (the shortest) with follicle size bigger than 10 mm and were made up within 69 hours. The estrus manifestation hours according to the follicle size in heifers didn't have any significance each other (p>0.05) and took around 42 hours (the shortest) with follicle size of 5mm (the smallest) and were made up within 66 hours. Follicles after $PGF_{2{\alpha}}$ injection were ovulated and assigned to many phases as follows; Group 1 (growing phase) - continuously growing into ovulation, Group 2 (growing and static phase) - delaying in growth after the growth of follicles, Group 3 (static and growing phase) - growing after growth delay, Group 4 (regressing and new growing phase) - the follicle is closed and a new follicle grows. In addition, the process of follicle development and estrus hours had no significance each other (p>0.05), though estrus manifestation hours in Group 1 and 2 was relatively short, and in Group 3 and 4 for a relatively long time. In the result of all above, the estrus manifestation hours after $PGF_{2{\alpha}}$ injection has no differences accoring to the follicle size in cows and heifers. Therefore, High pregnancy rate is obtained when practicing artificial insemination within 3 days in estrus or TAI in 72 to 80 hours after adminitrating $PGF_{2{\alpha}}$.
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한우에서 $PGF_{2{\alpha}}$ 투여에 의한 발정유도 후 난소 구조물 및 호르몬의 변화와 수태율
박철호,류재선,유대중,박인철,김종택,서국현,오기석,손창호,Park, Chul-Ho,Ryu, Jae-Sun,Yu, Dae-Jung,Park, In-Chul,Kim, Jong-Taek,Suh, Guk-Hyun,Oh, Ki-Seok,Son, Chang-Ho 한국수정란이식학회 2012 한국동물생명공학회지 Vol.27 No.3
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.
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한우 저수태우 임신율 개선을 위한 CIDR PLUS와 CIDR GnRH 발정동기화 비교
조상래(Sang-Rae Cho),고응규(Yeoung-Gyu Ko),유대중(Dae-jung Yu) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.8
본 연구는 인공수정을 2~3회 실시하여 임신이 안 되는 저수태우를 대상으로 발정동기화 기술을 적용하여 번식률 개선 효과 구명을 위해 실시하였다. 발정동기화 처리를 통한 인공수정 등의 첨단 번식기술 활용은 우수한 혈통을 기반으로 하는 종축의 생산과 우량 형질 보유 암소의 증식 그리고 유사시 가축의 복원 등에 중요한 기술로 사용된다. 따라서 저수태우의 발정동기화 처리 방법은 CIDR PLUS(CIDR device, with Estradiol benzoate(EB), PLUS) 와 CIDR GnRH(CIDR device and Gonadotropin-releasing Hormone, GnRH) 두 가지 방법을 저수태우에 삽입 처리하여 발정을 유기 하였다. 주요결과는 다음과 같다. 2021년 지역별 한우 사육농가를 대상으로 한 저수태우 발생 현황은 약 9.1% 수준으로 조사되었다. 최근 3년 동안 발생한 비임신 암소에 대한 번식우 활용 조사결과에서는 암소를 비육하여 판매하는 비율이 약 60.8%, 그리고 암소의 형질이 우수하여 임신을 위해서 관리를 지속적으로 한다는 비율이 약 39.2%로 조사되었다. 암소의 번식이 불가능 할 경우는 비육하여 판매하는 비율이 유의적으로(P<0.05 ) 높게 분석되었다. 저수태우 대상으로 번식재개를 위해 서로 다른 두 가지 발정동기화처리 방법으로 임신의 효과에 대한 실험 결과 CIDR PLUS 방법은 56.9% 그리고 CIDR GnRH 방법은 85.2% 임신이 재개되었으며, CIDR PLUS 방법 보다 유의적으로(P<0.05 ) 높은 결과를 확인하였다. 결론적으로 비임신 암소의 번식 재개를 위해서는 두 가지 발정동기화 방법을 사용이 가능한 것으로 나타났으나, CIDR GnRH 방법 활용이 더 효과적인 것으로 사료된다. This study aimed to improve the breeding rate in repeat breeder (RB) cows that were unable to become pregnant, despite having a normal estrus cycle. The methods used to synchronize the estrus were the controlled internal drug release (CIDR) PLUS (CIDR device, with estradiol benzoate (EB), PLUS) and the CIDR GnRH (CIDR device and gonadotropin-releasing hormone, GnRH). The study found that the proportion of non-pregnant cows was about 9.1%, which is a relatively high percentage. The study also surveyed the use of breeding cattle as RBs over the past three years and found that the sales rate of fattened cows was about 60.8%, while the rate of management for pregnancy was about 39.2%. The ratio of meat sales was significantly higher (P<0.05). The study then analyzed two methods of estrus synchronization: the CIDR PLUS method and the CIDR with the GnRH method. The results showed that the CIDR PLUS method had a success rate of 56.9%, while the CIDR with the GnRH method had a success rate of 85.2%, which was significantly higher (P<0.05) than the CIDR PLUS method. In conclusion, the study found that RB cows could be effectively bred using the above two methods of estrus synchronization. Among these methods, the CIDR GnRH method was found to be more effective in resuming pregnancy. These findings can help improve the breeding rate of RB cows and increase their productivity.
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