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Development of Bovine Embryos Produced by Intracytoplasmic Sperm Injection (ICSI)
Ock, S.A.,Kwack, D.O.,Cho, S.R.,Cho, S.K.,Yeao, E.H.,Yoo, J.G.,Lee, Y.R.,Lee, H.J.,Choe, S.Y.,Rho, G.J. 韓國受精卵移植學會 2002 한국동물생명공학회지 Vol.17 No.1
Intracytoplasmic Sperm Injection (ICSI) has been widely used fur both human infertility and basic research. However, the high incidence of chromosomal abnormality is severe problem in cattle. Various oocyte activation stimuli, therefore, were compared by assessment of developmental capacity and chromosome analysis. Motile sperm selected by Percoll-density gradient were treated with 5 mM dithiothreitol (DTT) and injected into an oocyte matured fur 24 h. Eggs were then allocated into 5 treatment groups. Group 1 (control), sperm injection was performed without any further activation stimuli to the oocytes. Group 2 (handled control), sham injection was performed without sperm. In Group 3, oocytes exposed to 5 (M ionomycin for 5 min at 39(C. Group 4. ionomycine + 1.9 mM demethylaminopurine (DMAP, 3 h) and Group 5, ionomycine + 3 h culture in Ml99 + DMAP. Cleavage and the later development rate in Groups 1, 2 and 3 were significantly (P<0.05) lower than those in Groups 4 and 5. The incidence of chromosomal abnormality in the embryos treated directly with DMAP after ionomycine was relatively higher than in the embryo of Group 3 h, delayed DMAP treatment. From this results DMAP caused to be arrested the release of the 2nd polar body, resulting in changes of chromosomal pattern. Therefore, the time interval between ionomycin and DMAP is a crucial role in bovine ICSI.
金炯遠,睦榮珪,黃龍燮,柳建一,郭鎭榮 최신의학사 1971 最新醫學 Vol.14 No.12
The Wilkie's syndrome is an unusual form of duodenal obstruction due to compression of the distal duodenum between the aorta and the superior mesenteric artery. Authors report one case of duodenal obstruction due to superior mesenteric syndrome (Wilkie's syndrome) in 16-years old male student. A well development under nourished thin 16-years old male was admitted with abrupt onset of colicky abdominal pain and intermittent vomiting for two days, who no specific past, history except postprandial fullness. The diagnosis of Wilkie's syndrome was made under radiologic findings and above chief complaints. The operative treatment was performed by side to side anastomosis of- the jejunum to the dilated duodenum. We report a case of Wilkie's syndrome with brief review of several literature.
손시환,고영두,김두환,박구부,이정규,이철영,신철교,정희식,곽석준,박명구,천민성,백철승 한국축산학회 2000 한국축산학회지 Vol.42 No.1
The Korean Native Stripped Cattle known as Chickso have distinctive black hair belts all over the body to varying extents on a Hanwoo(Korean Cattle)-like yellowish brown background. These Battle are remaining only in a limited area of this country and are known to yield a flavorful meat somewhat distinct from that of Hanwoo, but their genetic lineage has not been identified. We have carried out karyotyping of these cattle firm the lymphocyte culture. Blood samples were collected from 20 of male and female cattle that had been bred at Poongjeon Farm located in Kosong, Kyongnam, and were subjected to chromosomal morphology and G- and C-banding analysis. Chickso, like Hanwoo, had 58 autosomes and X and Y sex chromosomes which were morphologically very similar to those of the latter. All the 58 autosomes revealed almost a zero value of centromeric index, suggesting that they are acrocentric; sex chromosomes X and Y were submetacentric and metacentric, respectively. Following G-banding, the light bands appeared near the centromeric site in all the autosomes whereas the specific dark bands were consistently visible in each homologous chromosome. Overall, the G-banding pattern was nearly identical between the Chickso and Hanwoo. C-bands representing the heterochromatin were present at or near the centromere in all the autosomes, whereas in sex chromosomes, they were found distributed on variable sites. The proportion of constitutive heterochromatin ranged 20∼30%. These patterns were not significantly different between the two subspecies. All of these cytogenetic results suggest that the distinctive traits of Chickso did not arise from a cytogenetic variation from Hanwoo, i. e. the former is simply a subpopulation of the latter. As such, we propose that selection and propagation of the Chickso based on economic traits may be advantageous to the domestic beef industry.
저단백질사료 급여시 육성돈의 Methionine 요구량에 대한 연구
김광현(K . H . Kim),곽종형(C . H . Kwack),김용식(Y . S . Kim),전우복(W . B . Chun),이상진(S . J . Lee) 한국축산학회 1990 한국축산학회지 Vol.32 No.12
This study was conducted to determine the optimumn level of DL-methionine for pro-finishing piglets fed 12% CP corn-soy diet fortified with 0.24% L-lysine and 0.06%, L-threonine. Onehundred and twenty growing pigs(L × W × D :34.4kg BW) were randomly allotted to 4 supplemental levels of DL-methionine treatments(0, 0.035, 0.07 and 0.105%) for 36 days feeding trial Each treatment consisted of 3 replicates and 10 pigs per replicate, respectively. A metabolic trial was conducted with 12 pigs for 5 days after the feeding trial. Results obtained were summarized as follows: l. Although there was no statistical differences among treatments, the average daily weight gain in 0.07% treatment and feed intake in basal diet were a little higher than the other treatments. However, there was a significant difference(p$lt;.05) between 0.07% and other groups in feed conversion. 2. Although there was no significant differences among treatments, the highest values of crude protein digestibility, TDN and nitrogen retention were obtained with the 0.07% treatment. However. the methionine availability value(88.82%) of 0.07% treatment was significantly(p$lt;.05) higher than those of the other treatments. 3. The free S-containing amino acid level of plasma tended to increased as dietary level of methionine increased. However, the plasma urea-N level was the lowest in 0.07% treatment. 4. The total non-sulfur free essential amino acid level of plasma was lowest in 0.07% treatment and tended to increase as the methionine level increased to 0.105%. It could be concluded that the optimum level of DL-methionine supplementation for growing piglets fed 12% CP corn-soy diet is 0.07%, resulting in 0.45% S-containing amino acids in the diet.
가토의 과잉배란과 수정란의 발생 및 난관이행에 관한 연구
박충생,정기화,곽대오,정현증 경상대학교 축산진흥연구소 1985 畜産振興硏究所報 Vol.12 No.1
This experiment was conducted to find an effective method for superovulation and embryo development and passage in the oviduct after ovulation in the rabbit. Twenty-seven mature female rabbits (2.0-3.6kg) were confined in individual cages previously for a month and used in the experiment. The rabbits were given single s. c. injection of 50 IU or 100 IU PMSG a day for 5 days, and mated after single i. v. injection of 250 IU HCG 48 hours following PMSG injection. The superovulation response in rabbits were not significantly(P$lt;0.05) different between the PMSG doses of 50 IU and 100 IU, when assessed by the ovulation points (16.4±2.3 vs. 19.2±3.4), number of follicles and blood follicles. Serotropin was significantly (P$lt;0.01) superior to Serarumon in ovulation points (34.0±4.2 vs. 20.2±5.2) and number of blood follicle, but the number of follicles were not significantly (P$lt;0.05) different between two products. Recovery rate and fertilization rate of eg8s were not affected significantly (P$lt;0.05) by PMSG dosage, PMSG products or estrogen priming. The overall recovery rate and fertilization rate of eggs were 73.6 and 90.6%, respectively. All of the one-cell ova, 64% of morulae and all of the blastocysts were found in 20, 60 and 90 hours after mating, respectively. All or 95% of the eggs were recovered from the oviduct 40 or 60 hours after mating, and from the uterus 90 hours after mating, and by 72 hours after mating, 82% of the eggs was recovered from the uterus.
Report of postharvest rot of kiwifruit in Korea caused by Sclerotinia sclerotiorum
Lee, J.H.,Kwon, Y.H.,Kwack, Y.B.,Kwak, Y.S. Elsevier Science Publishers 2015 International journal of food microbiology Vol.206 No.-
In May 2014, sclerotinia rot symptoms caused by Sclerotinia sclerotiorum were observed on stored kiwifruit in Jinju, South Korea. The symptoms appeared as soft, water-soaked lesions on fruit covered with a white mycelium. The morphological characteristics and the internal transcribed spacer sequences of rRNA of the pathogen isolated from the sclerotinia rot showed it to be S. sclerotiorum. This was confirmed by performing a pathogenicity test with pure cultures of S. sclerotiorum and by reisolating S. sclerotiorum from artificially inoculated kiwifruits. Our results should help promote a better understanding of the diseases that affect kiwifruit and improve practices for postharvest disease control in the kiwifruit industry.