Publications by authors named "Seong-Chan Yeon"

Determining reference intervals (RI) is a valuable asset for assessing the health of wildlife species. This is the first study to establish serum biochemical RIs in Siberian weasels. Forty-two healthy free-ranging Siberian weasels were captured live and brought to Seoul Wildlife Center between June 2021 and August 2022.

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In several species, the vertebral heart scale (VHS) measurement is frequently used to provide a more objective evaluation of cardiomegaly. However, normal-sized parameters for radiographic measures of the cardiac silhouette in Siberian weasels () have not been determined. Right lateral (n = 24) and ventrodorsal (n = 20) thoracic radiographs from free-ranging Siberian weasels with clinically normal cardiac and pulmonary function were acquired and evaluated to determine the specific VHS for the Siberian weasel.

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  • Wild migratory birds play a crucial role in maintaining healthy ecosystems, yet the impact of rehabilitation on their gut microbiomes is not well-understood.
  • In a study involving six species of wild migratory birds in South Korea, researchers found that gut microbiome diversity decreased during rehabilitation and did not return to normal levels, leading to an increase in harmful pathogens and decreased beneficial bacteria.
  • Additionally, the study indicated rising antibiotic resistance among rehabilitated birds, specifically against common antibiotics, which may hinder their adaptability to natural environments post-release.
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  • Hydrocephalus is a common brain malformation in domesticated dogs but is not well-studied in wild carnivores like raccoon dogs.
  • A raccoon dog pup exhibited symptoms such as a domed skull and severe neurological issues, confirmed by imaging techniques showing significant brain ventricle enlargement.
  • Despite treatment efforts, the pup was euthanized due to a poor prognosis, and necropsy confirmed hydrocephalus with characteristics that matched the imaging results.
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Background: The rehabilitation of injured wildlife and their subsequent release into the wild is a humane act as well as important in wildlife conservation. However, little is known about the animals' fate after release. Therefore, to address these uncertainties, it is essential to adequately describe how the injured animals were treated and managed before releasing into the wild; moreover, post-release monitoring should also be performed.

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Cat vocalizes to communicate with another and express their internal states. The vocal repertoire of the cat is wide and up to 21 different vocalizations have been described in the literatures. But it is more than probable that the repertoire contains more types of vocalizations.

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Tumor incidence in wild mammals is reportedly very low. Wild nutria, a large rodent, is known to carry many infectious diseases, but rarely exhibits neoplastic diseases. We necropsied a male wild nutria and found a large nodular mass in the left inguinal region, adjacent to the penis.

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The present study evaluated the effects of fluoxetine on decreasing stereotypic behaviors in Asiatic black bears (ABB). Four captive ABB exhibiting stereotypic behaviors were administered fluoxetine (0.25-1 mg/ kg orally every 24 hr) for 91 days.

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Several eradication programs have been developed and executed to curb alien invasive species that tend to damage the ecological environments they colonize; however, only few studies have evaluated the utilization of carcasses of these species after eradication. Nutria () is an invasive rodent species targeted by eradication programs in many countries. We noted that nutria produce large amounts of ursodeoxycholic acid (UDCA) in their bile.

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In this study, we used multiplex polymerase chain reaction (PCR) to determine the sex of leopard cats (Prionailurus bengalensis euptilurus) in Korea. When we applied PCR using primers based on the intronic region between ZFX and ZFY, only one DNA band of 143 bp was detected in females, compared with two specific bands of 143 and 310 bp in males, indicating that the band patterns were clearly different between females and males. Since the set of primers also proved compatible with tissue and fecal samples, the results of the present study demonstrate that the present PCR could be a convenient tool for identifying the sex of leopard cats.

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Background: Sarcoptic mange in free-ranging raccoon dogs (Nyctereutes procyonoides) caused by Sarcoptes scabiei is a widespread zoonotic disease that causes severe skin lesions with significant morbidity and mortality. Fluralaner is a member of the isoxazoline chemical class and is an acaricide and insecticide widely used in flea, tick and mite infections of dogs (Canis lupus familiaris).

Objective: To evaluate the clinical efficacy of orally administered fluralaner in free-ranging raccoon dogs naturally infected with sarcoptic mange.

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The nutria (Myocastor coypus) was introduced to South Korea in 1987 for breeding of individuals for fur and meat industry, and was accidentally released into the wild. Here, we report the development of microsatellites for the nutria collected from South Korea using Illumina MiSeq genome sequencing to identify the genetic variability and demographic history of these introduced populations. A total of 626,282 microsatellite sequences were identified, and nine polymorphic loci were characterized.

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A total of 44 adult or juvenile nutrias were necropsied for disease survey. A large nodule was found in the liver of a nutria. The histopathological specimen of the hepatic nodule was microscopically examined, and sectional worms were found in the bile duct.

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The aim of the present study was to investigate the diagnostic accuracy of ultrasonography in the detection of mild pneumothorax using computed tomography (CT) in dogs. Nine adult healthy beagles were included in the study. A thoracic tube was inserted into pleural space at the left thoracic wall, and each dog underwent the examinations in the order of CT, lung ultrasonography, and radiography before the infusion of room air into the pleural space.

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The objective of this study was to measure differences between arterial and venous blood gas parameters and to evaluate whether arterial blood gas values can be estimated from venous blood in Asiatic black bears (ABBs). Twelve healthy captive ABBs (8 males and 4 females; 8-16 years; 76.8-220 kg) were included in this study.

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The Asiatic black bear ( Ursus thibetanus ; ABB) is a globally endangered species for which a restoration program has been ongoing in South Korea since 2001. However, there is little information on immobilization protocols for ABBs. We evaluated the use of medetomidine-zolazepam-tiletamine for their immobilization.

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Anesthesia is an inevitably important component of diagnosis and treatments examining the health condition of wild animals. Not only does anesthesia become an essential tool in minimizing stress of the patients and providing an opportunity to deliver accurate and safe procedures, but it also ensures the safety of the medical crew members. This study was conducted to investigate the dose-response cardiorespiratory effects of isoflurane during spontaneous ventilation in ten cinereous vultures.

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The objective of this study was to determine the dose-dependent effects of isoflurane on various cardiovascular parameters and the stable range of isoflurane concentrations in Asiatic black bears (Ursus thibetanus). Seven Asiatic black bears were intramuscularly injected with medetomidine, zolazepam and tiletamine (MZT) to induce anesthesia, and anesthesia was maintained by administering isoflurane in 100% oxygen (4 l/min) without mechanical ventilation. Several cardiovascular parameters were measured at five end-tidal isoflurane concentrations (0.

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Capillaria hepatica is a zoonotic nematode that uses rodents and other mammals as hosts, especially rats and mice, and causes hepatic granuloma and eventually fibrosis/cirrhosis. However, C. hepatica infection in nutria, a large semiaquatic rodent, has rarely been reported, and histopathologic features of the infection have not been described in detail.

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The expression of immunogenic markers after differentiation of umbilical cord blood (UCB)-derived mesenchymal stem cells (MSC) has been poorly investigated and requires extensive in vitro and in vivo testing for clinical application. The expression of human leukocyte antigen (HLA) classes on UCB-derived MSC was tested by Fluorescence-activated cell sorting analysis and immunocytochemical staining. The undifferentiated MSC were moderately positive for HLA-ABC, but almost completely negative for HLA-DR.

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The objective of this study was to evaluate the feasibility and accuracy of estimating the smallest amount of abdominal free gas detectible in a large population of Beagles by ultrasonography. Healthy dogs were randomly divided into three groups: group A that received 0.1 mL of air injected into the peritoneal cavity, group B that received 0.

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We investigated the differences between vocalizations of mares in estrus and diestrus and determined the spectrographic parameters to discriminate estrus from diestrus. Thoroughbred brood mares (n=89) were exposed to a teasing procedure for 3 min, and we recorded all vocalizations emitted from them. Among the mares, 56.

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The aim of this study was to determine whether socialized Jindo puppies would show different behavioral reactivity from non-socialized puppies. Puppies (n=12), 7 weeks of age, were divided into socialized and non-socialized groups. The socialized group from the 7th until 13th week after birth was provided a socialization program, and the non-socialized group was reared in a semi-isolated environment without being exposed to the program.

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This study was carried out to investigate the effect of ovariohysterectomy on vocalization during territorial aggression of German Shepherd dogs. Sixteen clinically healthy dogs of 5 to 10 months old were assigned randomly to one of two groups: ovariohysterectomy or control. Their behaviors and vocalizations induced by the approach of a strange with a strange dog were recorded using digital camcorder at four and five months after surgery and were analysed.

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The aims of this study were to investigate whether upper airway sounds of dogs with laryngeal paralysis and tracheal collapse have distinct sound characteristics, compared with unaffected dogs. The sounds of 5 dogs with laryngeal paralysis and 5 dogs with tracheal collapse were recorded. Honking sound appeared as predominant clinical signs in dogs with tracheal collapse.

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