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양재혁,박용수,노환국,손원근,이두식,황규계,임윤규,Yang, Jaehyuk,Park, Yong-Soo,Nho, Whan-Gook,Son, Won-Geun,Lee, Du-Sik,Hwang, Kyu-Kye,Lim, Yoon-Kyu Korea National University of Agriculture and Fishe 2014 현장농업연구지 = Journal of practical agricultural resear Vol.16 No.1
Equine herpesvirus type 1 (EHV-1) is an economically important pathogen of horses and exerts its major impact by inducing abortion storms and sporadic abortions in pregnant mares, early neonatal death in foals, and respiratory disease in young horses. Although equine herpesvirus type 4 (EHV-4) rarely causes clinical manifestations of disease in organs other than the respiratory track, isolated cases of myeloencephalopathy and sporadic abortions have been reported in EHV-4 infections. Here, we report an abortion storm in Thoroughbred breeding farms in Jeju island, South Korea. It occurred for 16 days from first abortion to last one. There were no clinical signs prior to abortion and stillbirth in broodmares. Two PCR-primers were made on glycoprotein B gene of EHV-1 and EHV-4 to amplify specific common regions of the viruses. We could detect the virus specific genes in aborted samples by PCR, and concluded that the cause of abortion storm was EHV infection. This report describes the first abortion storm case caused by EHV in Thoroughbred breeding farms in South Korea.
양재혁,정종태,이주명,황규계,임윤규,Yang, Jaehyuk,Cheong, Jongtae,Lee, Joo-Myoung,Hwang, Kyu-Kye,Lim, Yoon-Kyu 대한수의학회 2010 大韓獸醫學會誌 Vol.50 No.4
A 3-day-old Appaloosa colt was examined because of acute onset of ataxia, left-sided head tilt, fever and heart murmur. The foal continued to nurse but became increasingly depressed and mild colic. On plain radiological examination, the foal was normal. Uroperitoneum was diagnosed following abdominocentesis. Postmortem examination revealed bladder rupture. The lesion was in the dorsomedial part of the bladder wall. We suggested that the cause of bladder rupture was parturient trauma. Even though the rupture was associated with trauma, the margin of rupture of bladder was clearly smooth and regular.
Thoroughbred 씨암말에서 자궁파열과 연관된 대장탈출증 및 망아지의 각인 1례
양재혁,양영진,이용덕,김수연,김희석,강태영,황규계,임윤규,Yang, Jae-Hyuk,Yang, Young-Jin,Lee, Yong-Duk,Kim, Su-Yeon,Kim, Hee-Seok,Kang, Tae-Young,Hwang, Kyu-Kye,Lim, Yoon-Kyu 대한수의학회 2005 大韓獸醫學會誌 Vol.45 No.4
In this report, we described a case of acute colic with uterine rupture in a Thoroughbred broodmare during parturition. A 14-year-old broodmare showed acute colic characterized by rolling just after delivering of a healthy foal. Large intestine was prolapsed through vulva, contaminated with soil and its serosa was heavily damaged. We performed a euthanasia according to the owner's request. Post mortem examination revealed about 15 cm rupture on ventral side of the uterus. In addition, the orphan foal follow his owner after necropsy on his dam.
Evaluation on Blood Chemistry in a Thoroughbred Neonate (1-day old) with Congenital Torticollis
양재혁,Yang, J.H. Korea National University of Agriculture and Fishe 2019 현장농업연구지 = Journal of practical agricultural resear Vol.21 No.2
There have been no reports on the laboratory screening of congenital torticollis in equine medicine. The purpose of this study was to evaluate the blood chemistry of a newborn female foal with congenital torticollis. The filly was born after a normal parturition period, and the clinical pathology results were as follows: biochemistry of the plasma showed significantly higher levels of CK, LDH, and Na than those in a normal foal. However, Cl level was remarkably lower than that of the control. In conclusion, the cells in the neck muscles influenced the clinical pathological value in the neonate. A disorder of the muscles as well as the bone problem, such as the cervical vertebrae, may have caused congenital torticollis. To our knowledge, this is the first report detailing the clinical pathology results in a newborn foal with torticollis. These laboratory results can be used as a reference for interpretation of pathology results in foals.
Thoroughbred 1세말에서 상업용 말 인플루엔자 백신접종 후 항체역가 추적
양재혁,박용수,Yang, J.H.,Park, Y.S. 국립한국농수산대학교 교육개발센터 2018 현장농업연구지 = Journal of practical agricultural resear Vol.20 No.1
The object of this study was to evaluate the change of antibody titers on virus strains after inoculation with commercial killed equine influenza (EI) vaccines in horses. Serum antibodies of 20 Thoroughbred yearlings were detected using hemagglutination inhibition test for 41 weeks. Second vaccination is inoculated 4 weeks after the initial vaccination. Most of antibody titers were not increased until 4 weeks after first vaccination. The highest titers were detected 6-10 weeks after vaccination. The titers were decreased slowly and maintained for 16 weeks after inoculation. We could barely detect the antibody 41 weeks after vaccination in most cases. Vaccine anergia were appeared in 3 horses (15%) but it depended on virus strains. A/Equine/La Plata/93(H3N8) strain that induce high and durable antibody responses was the most effective among three strains. This study presents the first comprehensive data on the endurance of antibody titers against EI. Our data also suggests that yearlings should be inoculated three times in order to maintaining optimal antibody titers against EI. We speculate the causes of anergia were vaccine break down or individual specificity. Further research is needed to investigate immunological unresponsiveness. This was the first study on strain of equine vaccine in Korea.
A Case of the Large Colon Impaction in an Adult Donkey
양재혁,박용수,Yang, J.,Park, Y.S. Korea National University of Agriculture and Fishe 2018 현장농업연구지 = Journal of practical agricultural resear Vol.20 No.2
The purpose of this report is to describe the diagnosed case of a large colonic impaction in an adult donkey. An adult female donkey (Equus africanus asinus; 6-years-old) was admitted to the Equine Hospital of Jeju Race Park with signs of anorexia, which had started 1 day previously. Clinical examination revealed: weak gut sounds, dehydration, and severe abdominal distension, but normal respiratory and heart rates and no signs of pain. Transrectal palpation identified an impaction in the colon. The patient was treated with nasogastric siphonage, fluid therapy, and nonsteroidal anti-inflammatory drugs. Over the course of a day, her condition worsened; she started trembling, could not stand, and 2 hours later she died. Upon necropsy, a vast amount of ingesta was found in the large colon, particularly in the left ventral colon. The cecum and small colon were normal. Eleven days prior to presentation, the stable management and diet of the donkey had changed. We suspect that the change of feed, reduced water consumption, and lack of exercise precipitated the illness. However, the exact cause of the sudden death of the donkey requires further investigation.
Thoroughbred 포유 망아지에서 Ascarid Impaction 1례
양재혁,양영진,김성희,정종태,이경갑,우호춘,황규계,임윤규,Yang, Jae-Hyuk,Yang, Young-Jin,Kim, Sung-Hee,Chuong, Pham Duc,Cheong, Jong-Tae,Lee, Kyoung-Kap,Woo, Ho-Choon,Hwang, Kyu-Kye,Lim, Yoon-Kyu 대한수의학회 2004 大韓獸醫學會誌 Vol.44 No.4
A variety of enteric deseases may result in the manifestation of abdominal pain in horse. An acute colic in a 5-month-old Thoroughbred filly is described. The filly was presented with acute colic characterized by rolling and pawing. Next day she suffered from severe abdominal pain and subsequently died. Post mortem examination revealed very heavy ascarid, Parascaris equorum (P. equrum) infection in cmall intestine. In addition, it is also noted the presence of P. equorum in the stomach. Infection due to P. equorummanifests itself in foals between 6-8weeks and one year of age. P. equorum is a common and ubiquitous parasite that persists for many years in stables and on pasture in spite of good hygiene and anthelmintic control programs.
양재혁,Yang, Jae-Hyeok 대한수의사회 2010 대한수의사회지 Vol.46 No.11
말과 자동차는 서로 닮은 게 몇 가지 있는데, 순환기계 및 호흡기계는 말의 엔진을 구성하고 말이 소화 시키는 사료는 자동차의 연료와 같으며, 연료는 근육에 힘을 내는 영양적 에너지로 바뀐다. 호흡기계는 대사를 촉진하기 위해 산소를 제공하고 심장혈관계 또는 순환기계는 산소와 영양소를 조직에 운반할 뿐만 아니라 엔진이 작동하면서 생긴 노폐물도 제거한다.
양재혁,임윤규,Yang, Jaehyuk,Lim, Yoon-Kyu 대한수의학회 2012 大韓獸醫學會誌 Vol.52 No.1
This study evaluated the epizootiological characteristics of equine coital exanthema (ECE) in South Korea. A PCR test was used to determine the equine herpesvirus 3 (EHV-3) release period, excretion by suckling foals, morbidity rate, effect on fertility, and onset of breeding partner after treatment. The morbidity rate of ECE based on clinical symptoms was 8.3% (2/24) for stallions and 10.8% (45/416) for mares, and 29 of 45 (64.4%) animals were positive on the PCR test. Ten (22%) broodmares had symptoms before breeding, while 26 (58%) had symptoms after breeding. Nine (20%) mares had uncertain coverage periods and occurrence times. Suckling foals had no clinical findings and EHV-3 was not detected in their nostrils, although it was detected on teasers. No lesions were observed in the clitoral fossa on broodmares, although EHV-3 was detected by PCR. The period of EHV-3 emission was 22~23, 18~19, 6, and 58 days in stallions, broodmares, teasers, and mares with a mixed E. coli-like infection, respectively. ECE had no negative effects on the breeding capability of stallions and no symptoms were observed in broodmares after recovering from ECE.
Mortality rate undergoing anesthesia in Thoroughbred racehorses at Busan Race Park
양재혁,박용수,Yang, Jaehyuk,Park, Yong-Soo Korea National University of Agriculture and Fishe 2015 현장농업연구지 = Journal of practical agricultural resear Vol.17 No.1
The report about equine anesthesias in Korea are very rare. This paper aimed at the mortality rate during anesthesia in Thoroughbred horses at Equine Hospital of Busan Race Park, KRA in South Korea from 2005 to 2010. Drugs used in anesthesia was IV injection of detomidine hydrochloride (0.01 mg/kg) or xylazine(0.5mg/kg) for sedation and premedication, Guaifenesin(50-100 mg/kg) for muscle relaxation, ketamine hydrochloride(2 mg/kg) for induction of anaesthesia and Inhalational isoflurane(1.3-1.5 %) to maintain anesthesia. Total number of anesthetic cases was 190, 150 of inhalational anesthesia and 40 of general anesthesia, repectively. The purpose of anesthesia was highest in the disorder of musculoskeletal system, followed by urogenital system and respiratory system Mortality case due to anesthesia was one during arthroscopic surgery for removal of osteochondral chip fragments. The time of anesthesia was 150 min, fatal sign was hypoxemia and the reason was improper machine operation of the anesthetist. In conclusion, the perianesthetic mortality rate during anesthesia in Thoroughbred horses at Busan Race Park was 0.52%(1 death per 190 anesthetics).