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Fistulous withers causing spinal epidural abscess in a Thoroughbred mare. This case describes a 15-year-old Thoroughbred mare with fistulous withers that progressed to vertebral osteomyelitis and spinal epidural abscess (SEA), a severe complication that has yet to be reported. Initially treated with antibiotics and anti-inflammatory medication, the mare developed acute hindlimb ataxia and spastic paresis, suggesting spinal cord compression at T3-L3. Diagnostic imaging revealed vertebral fractures and abscessation, but vertebral canal involvement could not be confirmed. Despite aggressive medical therapy, including antimicrobials, corticosteroids, and neuroprotective...
Genetic and serological analyses of equine influenza viruses isolated in Kumamoto and Hokkaido, Japan in 2025. In April and May 2025, outbreaks of equine influenza occurred for the first time in 17 years in Japan. Equine influenza virus (EIV) of the H3N8 subtype was mainly detected in heavy draft horse populations in Kumamoto Prefecture and the Tokachi area of Hokkaido. In total, 10 EIVs were isolated from infected horses and then were used for genetic and serological analyses. Phylogenetic analysis of all eight genes revealed that all Japanese isolates were clustered with the Florida sublineage clade 1 (Fc1) viruses and were closely related to North American Fc1 viruses detected in 2024-2025. The resu...
Validation of the EYEMATE-SC Suprachoroidal Pressure Transducer for Telemetric Measurement of Intraocular Pressure in Normal Ex Vivo Canine and Equine Globes-Preliminary Results. To determine the accuracy of the EYEMATE-SC suprachoroidal tracer for telemetric tonometry in canine and equine globes. Methods: The EYEMATE-SC sensor (7.8 mm × 3.8 mm × 1 mm) was implanted in the suprachoroidal space of four freshly enucleated normal canine and two normal equine eyes. The anterior chambers were cannulated and connected to a reservoir of Plasma-Lyte A and a manometer. Starting at a manometric IOP of 5 mmHg, the pressure was progressively increased to 80 mmHg by raising the reservoir. At each setpoint (5, 10, 15, 20, 25, 30, 35, 40, 50, 60, 70, and 80 mmHg), t...
Effects of vitamin E and selenium supplementation on oxidative stress parameters and marker of genomic instability in show jumping equines exposed to different sources of atmospheric pollution. The inhalation of pollutants from fossil fuel combustion increases oxidative stress and may cause genotoxic damage, a risk heightened during physical exercise due to increased respiratory rates. This concern extends to equines engaged in intense activities like show jumping. Antioxidant supplementation with vitamin E and selenium may mitigate oxidative stress induced by exercise in polluted environments. This study evaluated the effects of oral supplementation on show jumping horses subjected to physical exertion in urban (n = 10) and peri-urban (n = 10) areas with varying pollution le...
Scoping review of comminuted fractures of the proximal phalanx in horses. Comminuted fractures of the proximal phalanx (CFPP) occur in adult horses. Various treatments have been described. It remains uncertain which is the best therapeutic option. Objective: This study aims to review systematically the existing literature on CFPP in horses, evaluate treatment modalities, synthesise outcomes to assess treatment efficacy and survival rates, and identify knowledge gaps for future research. Methods: Scoping review. Methods: A literature search was conducted using online databases. The bias quality of each article was evaluated. Chi-squared analysis was used to detect di...
Comparative analysis of blood whole transcriptome profiles in Yili horses pre- and post-5000-meter racing. This study employed Yili horses participating in a 5000-meter race as a model to investigate exercise-induced gene expression alterations in peripheral blood using whole transcriptome sequencing. Jugular vein blood samples from the three leading horses were collected pre- and immediately post-race, yielding 2,171 differentially expressed mRNAs (2,080 upregulated, 91 downregulated), 4,375 differentially expressed LncRNAs (4,354 upregulated), and 68 differentially expressed circRNAs (64 upregulated). GO/KEGG analyses demonstrated significant enrichment of differential mRNAs in transmembrane tran...
Microbiome and Dental Changes in Horses Fed a High Soluble Carbohydrate Diet. This study investigated the oral microbiome of horses maintained on a high soluble carbohydrate diet based on sugarcane, in comparison to those fed a pasture-based diet composed of spp., aiming to identify associations between dietary intake, the composition of oral microbial communities, and the occurrence of dental caries and diastemata. A total of 20 healthy horses, both male and female, with an average age of 9 ± 3 years and weight of 400 ± 100 kg, without a defined breed, were selected. They were divided into two groups: the High Soluble Carbohydrate Group (HSCCG), consisting of 10 hor...
Isolation of major bacterial species associated with equine skin wounds and in-vitro antibacterial activities of selected medicinal plants. Wounds on the skin are a common health issue affecting working equines. This study aimed to evaluate the in-vitro antibacterial properties of crude methanolic extracts from selected medicinal plants against pathogens isolated from equine skin wounds in Merti district. Agar well and disc diffusion tests were used to determine the mean zone of inhibition, while broth dilution methods were used to determine the minimum inhibitory concentrations and minimum bactericidal concentrations (MBCs), further confirming the potent antibacterial effects of the selected medicinal plant extracts. One way anal...
The Effect of Girth Design and Girth Tension on Saddle-Horse Pressures and Forelimb Stride Kinematics in Rising Trot. The aim of this study was to investigate the effect of girth design and girth tension; six horses regularly ridden were used. Each horse underwent four experimental sessions in an unbalanced Latin-square design with two girth tensions (8 kg or 16 kg) and two girth designs (straight girth (S) or anatomical girth (A)). Pressure between the saddle and the horse was measured at 100 Hz with a pressure mat (0.5 sensels per cm). Notably, 2D limb kinematics were determined from anatomical markers placed on the fore and hindlimbs. Video was collected at 240 fps. There was no significant effect of girth...
Horse model of spontaneous atrial fibrillation share proteomic changes with humans. Horses and humans are among the few mammals susceptible to spontaneous atrial fibrillation (AF), both suffering from high recurrence rates after treatment. Treatment resistance is often attributed to progressive atrial remodeling, but current treatment options fail to effectively address this aspect. Here, we introduce a novel horse model of spontaneous AF to investigate the biological pathway changes in early stages of the disease. Through data-independent acquisition mass spectrometry on biopsies from the right and left atrium and left ventricular chamber of horses with early-stage persisten...
Life-threatening anaphylaxis following antivenom administration in two patients with horse dander allergy. Antivenom is used to treat systemic envenomation and is immunoglobulin G raised from animals, mainly horses, inoculated by venom. Unassigned: We report two cases of life-threatening anaphylaxis following the administration of antivenom in patients with known horse dander allergy. Unassigned: A 14-year-old boy presented with redback spider envenomation. He had a known horse dander allergy. He received antivenom to treat severe pain and developed immediate severe anaphylaxis requiring endotracheal intubation and inotropic support. A 52-year-old man with horse dander allergy presented with suspec...
Extracellular Vesicles Derived From Endometrial Stem Cells Preconditioned With PGE2-Reverse Myofibroblast Phenotype in Mare Endometrial Cells: A Novel Anti-Fibrotic Approach. Endometrial fibrosis in mares compromises fertility through aberrant extracellular matrix deposition and sustained myofibroblast activation. Conventional interventions fail to reverse these pathological alterations, necessitating innovative, mechanism-focused therapies. In this study, we pioneered the use of prostaglandin E2 (PGE2) preconditioning of equine endometrial-derived mesenchymal stem cells (ET-eMSCs) and their extracellular vesicles (EVs) to target fibrotic processes directly. ET-eMSCs were isolated from mare endometrial biopsies pretreated with PGE2 to enhance their anti-fibrotic se...
Selection at the GSDMC locus in horses and its implications for human mobility. Horsepower revolutionized human history through enhanced mobility, transport, and warfare. However, the suite of biological traits that reshaped horses during domestication remains unclear. We scanned an extensive horse genome time series for selection signatures at 266 markers associated with key traits. We detected a signature of positive selection at -known to be a modulator of behavior in mice-occurring ~5000 years ago (ya), suggesting that taming was one of the earliest steps toward domestication of horses. Intensive selection at began ~4750 ya with the domestication bottleneck, leading ...
Single-nucleus RNA sequencing reveals developmental dynamics and cellular heterogeneity in the mammary gland of young fillies and adult Mongolian mares. Mongolian horses are famous for their lactation traits. Their milk contains a high protein content and low levels of fatty acids. Given their superior milk composition and historical use in dairy production across Inner Mongolia and Central Asia, Mongolian horses serve as a valuable model for understanding lactational biology. Multiple factors regulate the lactation process; however, a detailed study of this biological process has not been performed with single-nucleus RNA sequencing (snRNA-seq) technology. Insights gained from snRNA-seq of their mammary glands can inform molecular strategies ...
Emergence of Autochthonous Leishmania (Mundinia) martiniquensis Infections in Horses, Czech Republic and Austria, 2019-2023. We report 4 cases of equine cutaneous leishmaniasis caused by Leishmania martiniquensis in Czech Republic and Austria, outside the known endemic range of leishmaniases. The parasite should be considered as a potential cause of cutaneous lesions in horses; the risk for zoonotic transmission to immunocompromised humans is anticipated throughout central Europe.
The rise of rideable horses. Early horse riders selected a rare mutation in a single gene to enhance rideability.
Clinical study on the effect of low-intensity pulsed ultrasound on healing of proximal sesamoid bone fractures in Yili horses. The incidence of sports injuries in horses is increasing, thus accurate assessment, diagnosis, and treatment are critical. Among common sports-related injuries, proximal sesamoid bone fractures (PSBFs) are one of the most frequent types. To investigate the effects of low-intensity pulsed ultrasound (LIPUS) on imaging and hematological parameters of PSBFs, providing a clinical reference for the diagnosis and treatment of PSBFs in racehorses. After clinical diagnosis and radiographic examination confirmed the disease and its location, the affected horses were randomly divided into two groups: th...
Draft horses have similar outcomes as nondraft horses presenting for colic at a referral institution in Atlantic Canada. For horses presenting for colic to a referral hospital in Atlantic Canada, we aimed to describe clinical findings, diagnosis, treatment, and outcome for draft breeds; identify associations between clinical findings, diagnosis, treatment, and outcome for draft compared to nondraft breeds; and identify the overall impact of draft breed on mortality. Unassigned: A retrospective review of equine colic cases presenting to the Atlantic Veterinary College (2004 to 2023). Logistic regression models were used to assess associations between parameters and draft breed and mortality. Unassigned: A total o...
Development of an In-House ELISA for Serological Detection of Equine Herpesvirus-1/4 Antibodies in Turkish Horses. Equine herpesvirus 1 (EHV-1) and Equine herpesvirus 4 (EHV-4) are major viral pathogens of horses that contribute to respiratory disease, abortion, and neurological disorders, leading to economic losses in the equine industry. Accurate serological diagnosis is critical for disease surveillance and control. This study aimed to develop and validate an in-house enzyme-linked immunosorbent assay (ELISA) for detecting antibodies against EHV-1 and EHV-4 in horse sera. Serum samples previously confirmed by virus neutralization test (VNT) and a commercial ELISA were used to optimize the assay. Cut-off...
Molecular Detection and Prevalence of Equine Piroplasmosis and Other Blood Parasites in Equids of Western Aegean Türkiye. Equine piroplasmosis (EP), caused by and , is a tick-borne disease posing significant threats to equine health and the horse industry worldwide. Other vector-borne blood parasites, including , spp., and spp., can also infect horses; however, their prevalence remains poorly characterized in Türkiye. This study aimed to determine the molecular prevalence of , , , spp., and spp. in equids from the Western Aegean Region of Türkiye. Blood samples were collected from 388 clinically healthy equines across İzmir, Aydın, Denizli, and Muğla provinces. Species-specific PCR assays were performed...
Human Adenovirus 36 Antibodies in Horses with Different Metabolic Statuses. This study investigated the presence of antibodies to human adenovirus type 36 (HAdV-D36) in horses with different metabolic statuses, including normal, overweight, and those diagnosed with equine metabolic syndrome (EMS). A total of 151 serum samples were tested, of which 47.6% were positive for anti-HAdV-D36 antibodies. Although the horses were confirmed to be susceptible to HAdV-D36 infection, there was no significant correlation between infection and blood glucose or cholesterol levels. However, the triglyceride levels showed significant differences-they were particularly elevated in the s...
Genetic Diversity of Equid Herpesvirus 5 in Temporal Samples from Mares and Their Foals at Three Polish National Studs. Equid herpesvirus 5 (EHV-5) comprises a group of heterogeneous viruses with a worldwide distribution. Primary infection typically occurs early in life, which is followed by latency and periodic recrudescence of the virus. The aim of this study was to determine the genetic variation of EHV-5 in individual animals over time and to determine the dynamics of EHV-5 spread among selected mare-foal pairs at three horse studs. The partial glycoprotein B () gene was amplified from archival nasal swab samples. Sequences from 3-5 clones from each PCR product were compared using identity matrix, phylogeny...
Are Equine Assisted Interactions (EAI) a Dark Horse Bet? A Systematic Review on Measuring the Psychological and Physiological Effects of EAI on PTSD, Anxiety and/or Mood Disorders. Background: Conventional forms of trauma-focused psychological interventions seem to be less effective in military veterans with post-traumatic stress disorder (PTSD). Equine Assisted Interventions (EAI) have become increasingly popular as an additional treatment, resulting in increasing research on the effects of EAI. However, no systematic review on the effects of EAI has focused on PTSD, anxiety and/or mood disorders and whether the effects are reflected in psychological and physiological measures. This systematic review investigated the treatment effects, study design, population, interven...
Integration of empirical network data and agent-based modelling to examine the risk of equine influenza infection in equine athletes in Ontario, Canada. Horses are frequently transported, creating opportunities for the spread of pathogens. Disease transmission models for equine infectious diseases face limitations on their generalizability due to challenges in describing equine movement and the structure of their contact networks beyond simplistic assumptions. This study aimed to combine a stochastic, agent-based, SEIR model for equine influenza disease dynamics with an observed Ontario, Canada equine contact network structure to quantify the potential magnitude of equine influenza outbreaks in Ontario competition horses under different condit...
Effect of Fluorescence Biomodulation on Dermal Healing in an Equine Experimental In Vivo Wound Model. This study aimed to determine the safety and macroscopic/microscopic effects of fluorescence biomodulation (FBM) on experimentally induced, full-thickness, distal limb wounds in horses.This was an experimental study ( = 6 horses). Two full-thickness wounds were created on both dorsal metacarpi of six adult horses. Each forelimb was randomly allocated to either control (no FBM) or treatment (FBM) and randomly allocated to visual or histological assessment of healing. Wounds were treated within each experimental group every 7 days for four treatments. Fluorescence biomodulation wounds were ...
Are Immune-Integrative Biomarkers Predictors of Systemic Inflammation in Show Jumping Horses? This study evaluated the dynamics of blood immune-inflammatory biomarkers in response to exercise-induced changes in jumping horses. Methods: For this purpose, adult Brazilian Sport Horses (n = 9), aged 10.1 years, both sexes, underwent a specific training test consisting of warm-up, flatwork, and jumping exercises, and recovery on a 900 m sand track over 40 min. Clinical examinations and blood collections were performed at three time points: before (T0), immediately after (T1), and 1 h after (T2) the final exercise. Hematologic and biochemical parameters, such as total protein, gl...
Development and application of a NP-cELISA for the detection of nucleoprotein antibodies of equine influenza virus. Equine influenza (EI), caused by the equine influenza virus (EIV), is an acute respiratory disease that has become enzootic worldwide, resulting in frequent outbreaks and substantial economic losses within the equine industry. In this study, we developed a competitive enzyme-linked immunosorbent assay (NP-cELISA) for the detection of antibodies against the EIV nucleoprotein (NP). The assay was designed by coating plates with purified monoclonal antibodies (mAbs) against the NP protein, followed by simultaneous incubation of the test serum samples and HRP-NP antigen in a competitive binding rea...
Born to run? Associations between gestational and early-life exposures and later-life performance outcomes in Thoroughbreds. Gestational and early-life exposures may modulate development during growth and influence future athletic performance. Objective: To investigate associations between gestational and early-life exposures in Thoroughbreds and (i) likelihood of racing, (ii) total number of runs and (iii) total prizemoney by the end of the 3-year-old year. Methods: Prospective cohort. Methods: Daily records were kept on the location and duration of turnout, management and veterinary-attended episodes of disease or injury from birth until leaving the farm or study exit for 129 Thoroughbred foals on six stud farms. ...
Inflammatory response following intra-articular injection of decellularized porcine amnion/chorion in horses. The objective of the study was to evaluate effects of intra-articular decellularized porcine amnion/chorion suspension (dPACLS) in horses. Methods: Controlled, randomized, prospective study. Methods: A total of 10 adult horses. Methods: One randomly selected radiocarpal joint (RCJ) was injected with a high dose (HD) of 50 mg (n = 5) or low dose (LD) of 5 mg of dPACLS (n = 5). The contralateral RCJ received saline as control. Systemic serum amyloid A (SAA), synovial fluid analysis (including SAA) and subjective lameness evaluation were performed prior to injection (time 0) and 24, 4...
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