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Veterinary Integrative Sciences

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คณะสัตวแพทยศาสตร์ มหาวิทยาลัยChiang Mai

The official peer-reviewed journal of the Faculty of Veterinary Medicine, Chiang Mai University, Thailand.

24/08/2026

A preliminary study of the effects of enrichment tools on stereotypic behavior in captive Sun Bear (Helarctos malayanus)
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The stereotypic behaviors are common in captive bear. The objectives of study were to investigate 1) the effects of new enrichment tools on frequency of hand sucking/licking (HS) and pacing in captive sun bear; 2) the response of sun bear to each new enrichment tool. The data collection was divided into 5 parts: 1) before using enrichment 2) using puzzle feeder (PF) 3) using bamboo cradle) (BC) 4) using container (C) and 5) without using any new enrichment tool. The results showed that the frequency of HS in sun bear was not significantly affected by new enrichment tools (P>0.05). The lowest frequency of pacing was found after using new enrichment tools (P

24/08/2026

Effects of hydrogen peroxidase-inactivated vaccine against Streptococcus agalactiae infection in red tilapia (Oreochromis sp.) via different routes of administration
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Hydrogen peroxidase-inactivated vaccines have recently developed in controlling infectious diseases in aquaculture. The present study aimed to compare the efficacy of the hydrogen peroxidase-inactivated Streptococcus agalactiae vaccine via different delivery routes (injection, immersion, and oral administration) in red tilapia (Oreochromis sp.) without using adjuvant. Fish were randomly divided into 4 groups including G1: Control treatment (without vaccine), G2: vaccine-based diet (oral administration), G3: vaccinated by immersion and G4: vaccinated by injection. After 6 weeks of the experiment, fish were intraperitoneally injected with S. agalactiae and the mortality was recorded in 14 days. The results showed that lysozyme activity was differentially increased according to the delivery routes of vaccine, organs and time of sampling. However, the specific antibody levels in all vaccinated groups were only increased in week 6 post-vaccination. After the challenge test with S. agalactiae, the serum lysozyme levels in G3 and G4 were significantly higher than the control group (G1), while the total white blood cells and specific antibody levels were significantly increased in G2 and G4 compared to the control (G1). Similarly, the hydrogen peroxidase-inactivated vaccine statistically reduced the cumulative mortality in G2 (35.29%) and G4 (28.95%) compared to G1 (44.12%) after injected with the S. agalactiae. These results showed that the vaccine delivery routes by oral administration or injection may decrease the pathogen and show better protection for red tilapia than the immersion method. Further studies will be investigated to improve the efficacy of hydrogen peroxidaseinactivated vaccine via using different adjuvants.
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https://he02.tci-thaijo.org/index.php/vis/article/view/264684

23/08/2026

Isolation and identification of Escherichia coli O157:H7 from houseflies (Musca domestica L) at cattle barns in Al-Qadisiyah Province, Iraq
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Recent studies identified that Escherichia coli O157:H7 (ECO157H7) causes hemorrhagic colitis in humans, a rare spectrum of diarrheal illness. According to the findings of epidemiological investigations, cattle serve as the principal reservoirs for this bacterium. This study was conducted to understand the incidence of ECO157H7 in houseflies (HFs), a key disease vector. HFs (n = 40) were collected from cattle barns. The HFs were cultured on MacConkey (MC) agars, and any suspected colonies were grown on Eosin Methylene Blue (EMB) agar. EMB-based metallic sheen colonies were grown on specific media, such as sorbitol Chromagar (SCA) and cefixime tellurite sorbitol-MacConkey (CT–SMAC) agar. Sorbitol non-fermenting (SNF) isolates were subjected to a commercial latex agglutination kit to identify the existence of O157 group. The results recorded 31/40 (77.5%) E. coli isolates identified from HF samples. The findings revealed that only 18/31 (58%) were from the SNF isolates. The identities of the isolates were further examined by targeting the rfbO157 and fliCH7 genes, as genetic markers in a PCR method. The PCR results reported 10/18 (55.5%) and 12/18 (66.6%) isolates that carried the rfbO157 and fliCH7 genes, respectively. Our research revealed that HFs represent a harbor for the pathogenic E. coli. The ecology and way this bacterium spreads among animals and across the environment may depend heavily on the presence of ECO157H7 in agricultural environments.
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https://he02.tci-thaijo.org/index.php/vis/article/view/264704

23/08/2026

Relationship between parasitism with milk yield and body weight of Mafriwal cattle
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Mafriwal cattle have good characteristics, but parasitism effects on their production have never been explored. This study aimed to determine the relationship between phenotypic markers of parasitism, namely packed cell volume (PCV), peripheral eosinophils count (PEC), nematode eggs (EPG), and coccidia oocyst (OPG) with the milk yield and body weight of Mafriwal cattle. F***l and blood samples were collected from 242 cattle between 2021 and 2022. PCV and PEC were obtained from blood samples, while EPG and OPG were obtained from f***l samples. PCR was conducted to identify haemoparasite species. Milk yield data and the body weight of calves were also recorded. Spearman’s rank correlation showed that body weight has a negative correlation with PCV (r=-0.4; P

22/08/2026

Early-life development of spleen in white rabbit (Oryctolagus cuniculus): A morphometric and histochemical analysis
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The spleen's significant immunological and protective role has long inspired researchers to explore its developmental characteristics. This study intended to understand the splenic morphological developmental changes during postnatal life. Samples obtained form 25 (Oryctolagus cuniculus) white rabbits, divided into five age groups in :1, 10, 15, 30, and 90 postnatal days. The samples were measured to determine the length, breadth, thickness, and weight. afterward, the samples sectioned and stained using hematoxylin and eosin (H&E) and Masson's trichrome stains (MTs). And for histochemical analysis, additional slides were stained with Periodic acid schiff (PAS) and Alcian blue (AB) 2.5 pH stains. The histological measurements included the thickness of the capsule and trabeculae, diameter of white pulp follicle, and central artery, and the ratio of white and red pulps. The macroscopic findings showed a significant increase in dimensional measurements. Histologically, the capsule and trabeculae exhibited thickening, and the diameter of the white pulp follicles and central arteries expanded. And the splenic sinuses enlarged with age progression. The histochemical evaluation revealed intense staining with PAS in the capsule, trabeculae, and walls of splenic arteries in first postnatal day group, with moderate staining affinity in the other groups. Furthermore, there was positive staining with AB in the white pulp follicles of the first postnatal day group compared to weaker staining affinity in the older age groups. This study demonstrated that the critical development period begins after birth and continues until 30 postnatal days. During this period, the development of the immune response triggers significant alterations in the spleen's structural, morphometric, and histochemical parameters.
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https://he02.tci-thaijo.org/index.php/vis/article/view/267407?fbclid=IwY2xjawTTmPdleHRuA2FlbQIxMABicmlkETF0MmttZUhzM0RuR2FJMXdjc3J0YwZhcHBfaWQPNTE0NzcxNTY5MjI4MDYxAAEeFKvQRqgvnJPY4JJSlNsmeTaXFJxG5NN9gYYmXrXNUHaM1LLwiEFSVAnR144_aem__yiBQ62Sbng6-hTB15iMQw

22/08/2026

Isolation, molecular identification, and pathogenicity of Aeromonas hydrophila disease in clown knife fish (Chitala chitala) in the Mekong Delta, Vietnam
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Hemorrhagic septicemia disease caused by Aeromonas hydrophila bacteria appears to be more common and causes severe damage to many fish species worldwide. This research aimed to isolate, identify, and determine the pathogenicity and antibiotic susceptibility of A. hydrophila in septicemic clown knife (Chitala chitala) fish in the Mekong Delta, Vietnam. As a result, 116 bacterial strains were isolated from 176 septicemic fish samples. Two strains of bacteria, D2F71 and H1F39, were identified as A. hydrophila based on colony morphology, identification results by the API 20E kit, PCR technique, and aerolysin gene sequencing. In addition, these two strains of bacteria were experimentally infected on healthy clown knife fish (weight 15±4 g/fish) by injection method. The experimental results fulfilled Koch's postulates: infected fish showed signs of disease symptoms similar to those of naturally diseased fish. In particular, the two strains of bacteria D2F71 and H1F39 in the experiment had relatively high virulence, with LD50 values of 1.26×104 CFU/mL and 4.06×103 CFU/mL, respectively. The obtained findings demonstrated that the bacteria were susceptible to doxycycline, florfenicol, cefotaxime, flumequine, enrofloxacin, and sulfamethoxazole-trimethoprim at a rate of over 70%. On the contrary, the study found that bacterial isolates were resistant to ampicillin (100%), cefazolin (85%), streptomycin (80%), and colistin (80%). To our knowledge, this is the first report on hemorrhagic septicemic clown knife fish caused by A. hydrophila in Vietnam.
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https://he02.tci-thaijo.org/index.php/vis/article/view/268085

21/08/2026

Multiple renal and liver cysts in a Siberian hybrid tiger
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Polycystic kidney disease (PKD) is an inherited disease commonly reported in cats, but rarely in big cats. It is associated with formation of cysts in the kidneys. This article describes the clinical, pathology and immunohistochemistry findings of PKD in a Siberian hybrid tiger. A 16-year-old female captive Siberian hybrid tiger showed inappetence, weight loss, polyuria, and polydipsia. Within six months, its body weight and hydration status were progressively declining. Although hematology parameters were normal, serum creatinine and urea levels were elevated. Ultrasonography of the kidneys showed the presence of cysts. The animal was euthanized and necropsied, revealing multiple cysts in both kidneys and liver. These samples were subjected to histopathology using routine stain, special histochemistry, and immunohistochemistry. The cysts were lined by various types of epithelial cells. Most renal tubular epithelium showed severe vacuolar degeneration, accompanied by bacterial colonies in the renal pelvis. Masson’s trichrome stain demonstrated presence of mesenchymal stroma at the periphery of the cysts in the kidneys and liver. Immunohistochemistry showed different staining intensity of β-catenin, E-cadherin, and vimentin in the various parts of renal tubules, suggesting the involvement of epithelial-mesenchymal transformation. The tiger was diagnosed with PKD based on clinical and pathological examination. This is the first report of PKD in a tiger, potentially useful for future study in wildlife medicine and conservation.
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https://he02.tci-thaijo.org/index.php/vis/article/view/260963

21/08/2026

Entrapment of a jejunocecostomy anastomosis in the epiploic foramen in a horse
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A mare aged 9 years underwent surgical correction of a small intestinal volvulus using a side-to-side, hand-sewn jejunocecal anastomosis. Nine months after the jejunocecostomy, the horse developed colic signs and ultrasonographic examination revealed gas in the large colon in the upper right flank region and several enlarged loops of the small intestine in the lower right flank area. The differential diagnosis was right dorsal displacement of the large colon or small intestinal strangulation. The exploratory celiotomy found epiploic foramen entrapment (EFE) of the jejunocecostomy anastomosis, including parts of the distal jejunum and cecum. Manual reduction of herniation of the bowel in the epiploic foramen (EF) was impossible and the horse was euthanized. The postmortem gross finding revealed the enlarged edematous at the distal end of the jejunum and the initial body portion of the cecum had passed into the EF in the right-to-left (antegrade) direction. To the authors’knowledge, this is the first report of the antegrade epiploic foramen entrapment of a jejunocecostomy bowel part and this may be one of the complications encountered during the long-term survival period of a surgical jejunocecostomy in horses.
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https://he02.tci-thaijo.org/index.php/vis/article/view/260412

20/08/2026

Factors affecting milk composition in dairy farms located in Northern, Thailand
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The objectives of this study were to investigate variations in the milk composition and somatic cell count (SCC) from dairy cooperatives in Northern Thailand from January 2017 to December 2021. Milk composition among dairy cooperatives was also compared. The dataset included monthly milk composition (total solid (TS)%, fat%, protein%, lactose%, solid not fat (SNF)% and SCC) data from 15 dairy cooperatives, 2 private organizations, and their milk collection centers (1,800 records) collected in five provinces, including Chiang Mai, Chiang Rai, Lampang, Lamphun, and Phrae. The seasons were cold season (November to February), hot season (March to June), and rainy season (July to October). The dataset was compared among dairy cooperatives using a general linear mixed model. To detect a correlation, spearman correlation coefficients were calculated between SCC and milk composition. Results showed that the season significantly affected milk composition. The hot season appeared as the most critical season for all the parameters examined, showing the significantly lowest values (P < 0.001) of TS (12.33±0.3%), fat (3.79±0.27%) and protein (3.02±0.07%) whereas, a significantly highest SCC was obtained in the rainy season (321.21±3.93 x 1,000 cell/ml). Milk collecting centers of dairy cooperatives located in many districts had significantly different milk composition and SCC values. Lactose is the milk component that undergoes the greatest variation in response to the increase in SCC. This study highlighted the variations influencing milk composition and provided information for stakeholders and their roles in the dairy sector at the farm, dairy cooperative, and provincial levels.
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https://he02.tci-thaijo.org/index.php/vis/article/view/261426

20/08/2026

The prevalence and risk factors of Spirocerca lupi in domestic dogs in the Mekong Delta of Vietnam
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Spirocercosis is caused by Spirocerca spp., which is a chronic disease and might cause life-threatening due to forming cancer in oesophagus in canid carnivores. There are limited studies involving spirocercosis in domestic dogs. Thus, this study aims to investigate the prevalence and analyse risk factors involved in the S. lupi infection in Mekong Delta in Vietnam. In total, 400 f***l samples from domestic dogs were collected from May 2020 to May 2021. The overall prevalence of spirocercosis in domestic dogs in the Mekong Delta was 10.50% by copromicroscope and PCR methods. PCR targeted to the housekeeping gene cytochrome c oxidase I (cox-1) was applied to identify species of Spirocerca spp. and analyse the phylogenetic tree. Outdoor dogs had 5.48 times (CI 95% = 2.45-11.690, p < 0.001) higher risks of S. lupi infection compared to indoor dogs. Besides, seasons and age showed a correlation to the increase the risk of S. lupi infection, while neither dog breeds nor gender influenced the prevalence of this species. The cytochrome c oxidase I (cox-1) gene sequence of S. lupi in the Mekong Delta showed the high homologues to the S. lupi isolates in India, Israel, and the North of Vietnam and belonged to the S. lupi genotype 2.
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https://he02.tci-thaijo.org/index.php/vis/article/view/259950

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คณะสัตวแพทยศาสตร์ มหาวิทยาลัยChiang Mai
มหาวิทยาลัยChiang Mai
50100

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จันทร์	09:00 - 16:00
อังคาร	09:00 - 16:00
พุธ	09:00 - 16:00
พฤหัสบดี	09:00 - 16:00
ศุกร์	09:00 - 16:00

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