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Horses undergoing supramaximal fixed-speed treadmill exercise after administration of furosemide experience less severe acidosis and slower onset of fatigue. To document changes in acid-base and ion balance during exercise following furosemide administration and to relate them to performance. Unassigned: 6 fit Thoroughbred horses received 0.5 mg/kg IV furosemide (F) or a placebo (C) in randomized crossover order 4 hours before galloping to fatigue on a treadmill at the speed equated with an oxygen demand of 1.15 X maximum oxygen consumption (V˙o2max). Arterial and mixed venous blood was sampled before treatment, preexercise, after 2-minute warm-up, at fatigue, and 1 minute postexercise. The pH, temperature-corrected Pco2, total CO2, and sodium, po...
Increasing Seroprevalence In Horses Evidences Widespread Circulation Of West Nile Virus In Albania. West Nile virus (WNV) is a zoonotic mosquito-borne flavivirus that causes West Nile disease, an emerging and re-emerging infection of major global importance. Horses are an important sentinel species for monitoring WNV circulation. Since viraemia in horses is brief and viral loads in the blood are low, serological assays are the primary tools used to monitor WNV exposure. This study aimed to estimate the seroprevalence of WNV antibodies in horses in Albania. Between 2017 and 2020, 509 serum samples were collected from apparently healthy, unvaccinated horses across different regions of the coun...
Neosaxitoxin Downregulates Inflammation in an Equine In Vivo Model of Osteoarthritis. Chronic synovial inflammation is a hallmark of osteoarthritis progression and is tightly regulated by synovial macrophages. Recently, voltage-gated sodium channels (NaV) have emerged as potent modulators of macrophage-driven inflammation, positioning them as novel therapeutic targets. Among selective NaV channel blockers, neosaxitoxin exerts remarkable anesthetic and immunomodulatory effects; however, its effects on joint inflammation upon intra-articular delivery remain unexplored. Using an equine model of bilateral carpal osteoarthritis, this study evaluated the immunomodulatory and tissue-p...
Cord blood mesenchymal stromal cells combined with hyaluronic acid show symptom-modifying and potential disease-modifying effects in an equine osteoarthritis fetlock chip model. Osteoarthritis (OA) is a major cause of lameness in horses, and current therapies largely address clinical signs rather than disease progression. Mesenchymal stromal cells (MSCs) have shown promise as disease-modifying biologics, but their effects on joint structure and immunologic phenotype remain incompletely characterized. Unassigned: To evaluate the safety and efficacy of pooled cryopreserved equine umbilical cord blood-derived MSCs (eCB-MSCs) combined with hyaluronic acid (HA) for surgically induced fetlock OA in horses, using integrated clinical, imaging, and synovial biomarker outcomes....
Risk Factors for Disease in Military Working Equines. Diseases can impact Military Working Equids (MWEs) readiness and limit days in service. The objectives of this study are to categorize diseases in MWEs and evaluate potential risk factors for disease. Methods: Pathology reports from MWEs from 2005 to 2025 were retrieved from the Joint Pathology Center archives. Disease processes with ≥5 cases were evaluated for potential risk factors, including MWE breed, sex, neuter status, geographic location, and age at sampling. Results: Diagnoses included inflammation (n = 30), neoplasia/proliferation (n = 24), within normal limits (n = 12),...
Four Haylages, One Metabonome: Defining Diet Driven Metabolic Shifts in Ponies. Haylage is widely fed to all categories of stabled horses across Europe and New Zealand. Haylage can vary from high energy nutrient dense forage to low energy highly fibrous fodder, yet little is known about the impact different haylages have on metabolism in horses. This study provides the first direct comparison of feeding four different haylages: early cut (Lolium multiflorum), later cut (Lolium perenne) rye grass (R1 and R2); early and late cut meadow grass (M1 and M2), on urinary and faecal metabonomics, in ponies at maintenance. Using replicated Latin Square design, eight individually ho...
Phased T2T horse and donkey assemblies from a mule reveal peculiar equid centromere evolution. We present telomere-to-telomere genome assemblies of a Thoroughbred horse and a donkey derived from their mule offspring. Now adopted and annotated by NCBI as reference genomes, these assemblies resolve previously inaccessible regions, including satellite arrays, duplications, and telomeres. Equids are known to exhibit an uncoupling between satellite DNA and centromeric function. The completeness of these assemblies enabled annotation of both satellite-based and satellite-free centromeres, as well as non-centromeric satellite loci, revealing notable centromeric plasticity. They also allowed de...
Genome-Wide Identification and Characterization of the Wnt Gene Family in Donkey (Equus asinus): Phylogenetic Analysis and Expression Profiling. The gene family encodes highly conserved signaling molecules involved in vertebrate development, tissue homeostasis, and cell fate regulation. However, the evolutionary characteristics and potential biological functions of genes in the domestic donkey () remain poorly understood. In this study, we performed the first genome-wide identification and comprehensive characterization of the donkey gene family. A total of 19 genes were identified, consistent with the conserved repertoire reported in other mammalian species. Phylogenetic and synteny analyses revealed strong evolutionary conservat...
Sleep architecture and lying behavior in horses across age groups and two housing systems: an overnight non-invasive EEG study. Sleep is a crucial factor for the well-being of horses, yet assessing equine sleep in common housing conditions remains challenging. This study investigated the effects of changes in horses' immediate environment and the influence of age on their sleep and resting behavior using a novel, non-invasive electroencephalography (EEG) mask. Ten horses from the teaching herd at the University of Veterinary Medicine Vienna were observed over four consecutive nights in two different housing systems (a large communal stable vs. two separate, adjacent individual stalls). Data collection included EEG reco...
Detection and confirmation of hypoxia-inducible factor activating agents in equine plasma and urine by liquid chromatography coupled to mass spectrometry. Hypoxia-inducible factor (HIF) activating agents can promote the transcription of the erythropoietin gene, enhancing an athlete's performance, and are therefore prohibited in sports. A liquid chromatography coupled to high-resolution mass spectrometry (LCHRMS) method was developed for the detection and confirmation of 11 HIF-activating substances in equine plasma and urine. Ammonium formate added to the mobile phase system suppressed the responses of all the analytes in either positive or negative ion mode and thus was not used. The starting organic percentage in the mobile phase gradient and ...
Clinical outcomes of a novel flowable calcium silicate cement in equine endodontic treatment. Orthograde endodontic treatment of equine cheek teeth is performed infrequently with variable success rates of obturation with calcium hydroxide paste (CHP). A novel flowable calcium silicate cement (eCSC) formulated for use as an obturation material in equine teeth has demonstrated acceptable canal filling volumes and evidence of dentinal tubule penetration. However, clinical outcomes of eCSC-obturated equine teeth have not been reported. Objective: To report the clinical outcomes of orthograde endodontic treatment using eCSC. Methods: Retrospective case series. Methods: Horses that underwent...
Implications of dominance deviations for reproductive and morphological traits in the genetic management of the Pura Raza Española horse. Dominance is a non-additive genetic effect involving allele interaction at the same locus. In animal breeding, it has often been ignored due to its complexity and the low accuracy of pedigree-based estimates. This study analysed dominance variance components for reproductive traits [age at first foaling (AFF), reproductive efficiency (RE), interval between first and second foaling (I12)] and morphological traits [scapulo-ischial length (SIL), dorsal sternal diameter (DSD), knee circumference (KC)] in Pura Raza Española (PRE) mares. The aim was to assess the magnitude of dominance effects acro...
Short-term effects of pulsed electromagnetic field therapy on subjective flexion-associated lameness responses and circulating cytokines in horses with distal tarsal osteoarthritis. Pulsed electromagnetic field (PEMF) therapy is commonly used in equine sports medicine for its proposed anti-inflammatory effects; however, limited controlled studies have evaluated its physiologic effects in horses. Objective: The objective of this study was to investigate the effects of PEMF therapy on flexion-induced lameness and circulating cytokines in horses with radiographic evidence of distal tarsal osteoarthritis. Methods: Six mares were enrolled in a repeated-measures crossover design in which each horse served as its own control. Horses were evaluated at baseline (sham PEMF) and at ...
Evaluation of Serum Specific IgE Sensitization Profiles in a Korean Domestic Horse Population Using a Multiplex Allergen Line-blot Assay: A Cross-Sectional Screening Study. The purpose of this study was to evaluate the clinical applicability of a multiplex serum specific Immunoglobulin E (sIgE) test kit 'ANITIA Equine IgE' for identifying the causes of allergic diseases in horses raised in Korea, and to determine the major sensitization antigen profiles in the domestic horse population. Serum or plasma samples were collected from a total of 140 horses, classified by management system (Group A, n=108) and purpose (Group B, n=32). IgE concentrations for 120 environmental and dietary allergens were measured using a multiplex line-blot assay based on an indirect immu...
Race type and race distance as determinants of unseat events in U.S. steeplechase racing, 2023-2025. Unseat events in steeplechase racing, including falls and lost-rider incidents, affect equine welfare and jockey safety. Timber races are often perceived as higher risk than hurdle/fence races, but are also longer. Methods: This retrospective observational study analyzed 3070 U.S. National Steeplechase Association hurdle/fence and timber starts from 2023 to 2025. Flat, steeplethon, training, and apprentice/amateur-apprentice starts were excluded. Crude rates of falls, lost-rider incidents, and combined unseat events were compared between race types. Multivariable Poisson regression examined ...
Russell’s viper envenomation in a 9-month pregnant mare saved with high-dose antivenom: a first-in-world case report. Snakebite during pregnancy is an uncommon but potentially catastrophic event, with maternal and foetal outcomes closely related to the severity of envenomation. While snakebite in pregnant women has been sporadically reported and is known to be associated with significant obstetrical complications, envenomation in animals, particularly in pregnant horses, is exceedingly rare. Only a few isolated cases of snakebite in horses have been documented, and to the best of our knowledge, snakebite in a pregnant mare has not been previously reported in the medical or veterinary literature. Russell's vip...
Cryopreserved umbilical allograft (equicenta® CTM) improves clinical outcomes compared with clinician-selected standard of care in performance horses: a pragmatic prospective controlled trial. This multicenter, prospective, controlled clinical study and client survey evaluated the safety and effectiveness of an equine umbilical tissue suspension (equicenta® CTM; eCTM, 2:1) compared with clinician-selected standard of care (SOC) for treating lame performance horses. Unassigned: This pragmatic, real-world, open-label study enrolled horses diagnosed with appendicular musculoskeletal conditions affecting the joints, tendons, or ligaments under owner consent and an intention-to-treat design with an optional crossover after no improvement at 12 weeks and per-protocol analyses at 26 ...
Equine Ulcerative Genital Lesions Associated with Parapoxvirus. In 2026, a widespread outbreak of ulcerative dermatitis of unknown aetiology occurred in breeding horses in Ireland. The lesions resembled those associated with equine herpesvirus 3 (EHV3) infection, i.e., papules, vesicles, and ulcers on the penis of stallions and on the vulval and anal areas of mares. This study aimed to identify the probable causative agent. The methods applied included metagenomic sequencing of DNA, phylogenetic analysis, and real-time PCR. Metagenomic analysis directly from a penile sample confirmed the presence of equine parapoxvirus (EqPPV) DNA. Phylogenetic analysis in...
Pulsed wave tissue Doppler imaging of the left ventricle in foals: Feasibility, inter- and intra-observer variability and wave pattern over the first days of life. Tissue Doppler imaging (TDI) may improve the assessment of myocardial function in neonatal foals. Objective: To document the feasibility of left ventricular pulsed wave (PW) TDI, inter- and intra-observer variability and wave pattern over the first 5 days of life. Methods: Prospective observational study. Methods: Transthoracic echocardiography was performed in 25 healthy Standardbred foals within the first 24 h after birth (T1), between 60-84 h (T2), and 108-132 h (T3) after birth using right parasternal short-axis (R-LV SAX) and subcostal long-axis views at the mitral annulus, both a...
Rethinking Equine Cystitis: Evidence from Four Atypical Clinical Presentations. In this case series, four equines were diagnosed with cystitis, resulting in divergent clinical outcomes. Three animals achieved complete clinical resolution without recurrence, whereas one required euthanasia due to progressive clinical deterioration. All diagnoses were established through a dual-modality investigative protocol comprising cystoscopic evaluation and histopathological examination of bladder mucosal biopsies. The cohort exhibited considerable etiological heterogeneity. One case was classified as chronic idiopathic cystitis, while another was attributed to an opportunistic bacter...
MicroRNA signatures of equine asthma phenotypes in serum and bronchoalveolar lavage fluid. Equine asthma (EA) is a highly prevalent, chronic, inflammatory disease of the lower airways ranging from mild-to-moderate to severe clinical presentations. Diagnosis currently relies on bronchoalveolar lavage fluid (BALF) cytology, an invasive method associated with interobserver variability, which highlights the need for more reproducible approaches. MicroRNAs (miRNAs) are small noncoding RNAs involved in gene regulation. They are stable and readily detectable in body fluids and have shown promising results as biomarkers in human asthma. The aim of this pilot study was to characterize miRNA ...
Comparison of xylazine-ketamine-guaifenesin and xylazine-tiletamine-zolazepam protocols for constant rate infusion anesthesia in horses undergoing field castration. The common use of "triple drip" (xylazine, ketamine, and guaifenesin; XKG) is a popular protocol for constant rate infusion (CRI) in equine practice. However, due to restrictions on ketamine and guaifenesin in many countries, tiletamine-zolazepam (TZ) could serve as an alternative. To date, there have been limited studies evaluating the use of xylazine in combination with TZ (XTZ) administered via CRI to maintain surgical anesthesia in equine field practice. Objective: To compare the effectiveness and safety of XTZ infusion with the classical XKG protocol for field anesthesia. Methods: Twelve ...
Health assessment of Tokara horses on Nakanoshima island: potential chronic hepatic dysfunction induced by Leopard plant (Farfugium japonicum) ingestion. We investigated the health of Tokara horses (n=34) on Nakanoshima as part of conservation efforts for this breed. Although the horses were clinically healthy, elevated white blood cell count, neutrophil count and gamma-glutamyl transferase (GGT) levels were observed, leading to suspicion of chronic hepatic dysfunction and infectious disease. A survey revealed that the caretakers had been feeding the horses Leopard plant, which contains toxic pyrrolizidine alkaloids (PAs). The abnormal GGT levels observed in these horses may suggest the possibility of chronic PA poisoning resulting from the con...
Cold Atmospheric Plasma-Aerosol Treatment of Equine Antibiotic-Resistant Wound Infection: A Preliminary Case Series. Wound infections are common sequelae of wound treatment in horses. Secondary bacterial colonization with antimicrobial resistant microorganisms is of particular concern and is of crucial importance regarding the "One Health Concept". Due to frequent antimicrobial resistance (AMR), conventional treatments often involve determining resistance and sensitivity using time-consuming antibiograms. Infections with multi-resistant pathogens are especially challenging. This case series presents studies of four horses evaluating the efficacy of Cold Atmospheric Plasma-Aerosol (CAP-A) as a standalone trea...
Nucleic acid detection and molecular traceability of equine herpesvirus 1 in imported horses. Equid alphaherpesvirus 1 is a major pathogen threatening the global equine industry, causing respiratory disease, abortion, and neurological disease. Unassigned: In April 2024, during routine pathogen screening of a batch of imported quarantine horses from the Netherlands, four out of 20 nasal swab samples tested positive for EHV-1 nucleic acid. Unassigned: The affected horses exhibited only mild respiratory signs. ORF30 SNP typing at nucleotide position 2254 and Sanger sequencing confirmed that all positive samples belonged to the N752 non-neuropathogenic genotype. As virus isolation was unsu...
Advanced 3D Horse Reconstruction: Integrating Image-to-3D Modelling and Non-Rigid Registration for On-Barn Body Measurements. Precision livestock farming (PLF) relies on high-precision three-dimensional (3D) horse reconstruction and automatic body measurement to support refined breeding management and health surveillance. However, data collection is restricted by building environment noise and hardware layout constraints; complex equine body shapes and large individual variations induce local geometric distortions in reconstructed models, limiting field deployment. Drawing on generative 3D reconstruction, this study develops the first image-to-3D pipeline that leverages three consumer depth cameras to reconstruct hig...
Seroprevalence, risk factors and hematological parameters associated with Equine Infectious Anemia from Casanare, Colombia. Equine infectious anemia (EIA) is a persistent lentiviral disease with important sanitary and economic implications in tropical regions; however, epidemiological information in Colombia remains limited. Objective: To estimate seroprevalence, identify risk factors, and evaluate hematological alterations associated with EIA in horses from Casanare, Colombia. Methods: A cross-sectional study including 1,228 horses from 204 production units across 121 rural districts. Serological diagnosis was performed using agar gel immunodiffusion. Demographic and management data were obtained through an epidem...
Ultrasonographic assessment of in utero fetal presentation, position and posture can be essential: case report. The objectives of this clinical case report were to highlight the value of late transrectal ultrasound examination for assessing fetal presentation, position and posture and to describe the management of a case of malposture associated with musculoskeletal and cerebellar abnormalities, including its in utero ultrasound diagnosis and outcome. A 7-year-old Gypsy Vanner mare, 339 days pregnant, was diagnosed with the presence of a bony fetal structure cranial to the cervix, without palpable head or limbs and minimal fetal movement. Transrectal ultrasound examination was instrumental in diagnosing...
Antimicrobial effects of equine regenerative medicine products: A systematic review and meta-analysis of in vitro and in vivo studies. Equine regenerative medicine products involving platelet-rich plasma (PRP), mesenchymal stromal cells (MSCs), and their derivatives are increasingly explored for antimicrobial and therapeutic roles, but their efficacy and between-study variability remain unclear. Objective: To systematically review and meta-analyse in vitro and in vivo evidence on antimicrobial effects of equine regenerative medicine products and to evaluate their efficacy against key pathogens. Methods: Systematic review and meta-analysis: METHODS: We followed Preferred Reporting Items for Systematic Reviews and Meta-Analyses...
Oxidative Stress and Inflammatory Responses in Horses Naturally Infected with Theileria equi. Equine piroplasmosis, caused by the intraerythrocytic protozoan , is a globally distributed tick-borne disease characterized by persistent infection and variable clinical manifestations. Although oxidative stress has been implicated in the pathogenesis of several hemoprotozoan diseases, information regarding redox imbalance and its relationship with inflammatory responses in horses naturally infected with remains limited. This study aimed to evaluate oxidative stress, antioxidant status, inflammatory cytokines, and clinicopathological alterations in horses naturally infected with . Thirty-fiv...
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