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Effects of Nebulized Alpha-2 Macroglobulin in Horses with Lower Airway Inflammation. Equine asthma is a chronic inflammatory airway disease with limited safe long-term treatments. Alpha-2-macroglobulin (A2M), a natural anti-inflammatory protease inhibitor, may provide a novel non-steroidal therapeutic option for horses with lower respiratory tract inflammation. Objective: To characterize the impact of nebulization with alpha-2-macroglobulin (A2M) on clinical signs, bronchoalveolar lavage cytology, and local and systemic cytokine response in horses with lower respiratory tract inflammation. Methods: Thirteen university-owned horses with lower airway inflammation were randomized...
Mammary neuroendocrine tumor in a mare. A 10-y-old American Paint Horse mare was presented to the Equine Field Services at Virginia-Maryland College of Veterinary Medicine (Blacksburg, VA, USA) for evaluation of mastitis and a possible abscess in the right mamma. Histologic evaluation of a mammary biopsy revealed a densely cellular, infiltrative neoplasm with cells arranged in packets supported by thin stroma. In a neuroendocrine immunohistochemistry panel, the neoplastic cells did not immunolabel for neuron-specific enolase or synaptophysin, positively immunolabeled for chromogranin A, and had moderate scattered immunolabeling for ...
Interleukin 12 on extracellular matrix-related factors and functional characteristics of equine endometrial fibroblasts. Tissue fibrosis is described as the excessive accumulation of extracellular matrix (ECM) components. This process is associated with inflammation, and the interaction between fibroblasts and immune cells plays a key role, driving the progression of fibrosis. Results of recent study suggest that interleukin (IL)-12 may play a role in the processes associated with the development of fibrosis. This proinflammatory cytokine is synthesized and released by macrophages, dendritic cells, and B cells. Objective: The objective of this study was to determine: (i) the expression of IL-12 and its receptor ...
Seroprevalence, Risk Factors, and Environmental Correlates of Babesia caballi, Toxoplasma gondii, and Coxiella burnetii in Equids from Southwestern Greece. Equids, primarily horses, are mostly used for recreational purposes, although in some rural areas they also serve as working animals, maintaining close and frequent contact with humans. Their risk of exposure to vector-borne and zoonotic pathogens can be affected by host-related factors, management practices and environmental conditions. This study aimed to investigate the seroprevalence and associated risk factors for infections by , , , and sensu lato in equids from Southwestern Greece. A total of 159 equids were tested using commercial serological assays. Weighted prevalence estimates were...
Repeatability and test-retest reliability of thermal and pressure pain threshold testing in healthy thoroughbred horses. Quantitative sensory testing (QST) has been used in horses to assess nociceptive responsiveness but its broader clinical application is limited by variability across anatomical sites, environmental conditions, operator technique, and behavioral endpoints. This study aimed to evaluate the feasibility, within-session repeatability, and test-retest reliability of thermal threshold (TT) and pressure pain threshold (PPT) testing in healthy Thoroughbred horses. Unassigned: Eleven adult Thoroughbred horses (4 mares, 7 geldings; median [IQR] age 6 [5-6] years; body weight 558 ± 47 kg) underwent...
Spatiotemporal dynamics of equine group formation reveal the gradual emergence of social cohesion. Stable social relationships are essential for horse welfare, yet domestic management often involves regrouping unfamiliar individuals, potentially causing social stress. Fine-scale dynamics of social integration remain poorly quantified due to limitations of observational sampling. Using ultra-wideband real-time positioning, we tracked the development of spatial and social relationships in two newly formed equine groups (n = 19) over 2-12 months. Inter-individual distances decreased significantly, with time spent within 3 m of conspecifics increasing from 1.2 to 27.3% within two months, d...
Effects of flow-controlled expiration on oxygenation and early recovery in horses undergoing general anaesthesia. FLow-controlled EXpiration (FLEX) has been shown to significantly enhance oxygenation in horses under clinical and experimental conditions. Objective: To compare pulmonary gas exchange during early recovery following general anaesthesia in horses ventilated with FLEX compared with conventional intermittent positive pressure ventilation (IPPV) and to assess recovery characteristics between ventilation modes. Methods: Randomised, crossover in vivo experiments. Methods: Six adult horses underwent two 2-h anaesthetic episodes in a randomised crossover design (FLEX vs. IPPV), separated by a two-wee...
Auscultatory findings and left atrial function as indicators of mitral valve regurgitation severity in horses. Mitral valve regurgitation (MR) is frequently detected in horses, but its classification and prognostication remain challenging. This study investigated whether auscultatory findings and left atrial function are associated with MR severity. Methods: Fifty controls (no/trivial MR) and 101 MR horses (58 mild, 36 moderate, seven severe) were retrospectively evaluated. All were in sinus rhythm and underwent auscultation and echocardiography. Mitral regurgitation severity was graded using a scoring system. Systolic murmur characteristics (duration, type and grade) were recorded. Left atrial functio...
Genome-Wide Characterization of the TGF-β Gene Family in Donkey (Equus asinus) Reveals Lineage-Specific Gene Duplications and Deleterious Mutations. The transforming growth factor-beta (TGF-β) superfamily regulates diverse biological processes, including proliferation, differentiation, apoptosis, tissue remodeling, and reproductive signaling across metazoans. Here, we performed a genome-wide characterization of the TGF-β gene family in donkey (, ASM1607732v2) using comparative genomics and bioinformatics analyses, with horse (, EquCab3.0) as a reference to investigate evolutionary conservation and functional divergence. Genome assemblies and proteomes were retrieved from NCBI, and TGF-β genes were identified using BLASTp and HMMER searc...
Morphological study of nasal diverticulum in Grant’s zebra (Equus quagga boehmi Matschie, 1892). The nasal diverticulum (ND), a blind cutaneous pouch extending from the nasal vestibule (NV), is unique to Equidae. Although anatomical and histological descriptions of the ND are available for horses and donkeys, detailed studies in zebras remain limited. Objective: To investigate and characterize the anatomical and histological features of the ND in zebras and compare these findings with those observed in other species. Methods: Silicone casts of the NDs were prepared from two of three female Grant's zebra carcasses for anatomical measurements, followed by dissection for gross morphological ...
Prevalence of Clostridioides difficile in hospitalized neonatal mare-foal pairs from Alberta and direct comparison of fecal culture with toxin gene detection. is an important pathogen in the feces of adult horses and foals. It can be clinically diagnosed using several testing methods, including culture isolation and, more commonly, direct toxin gene detection from feces using molecular methods. The importance of monitoring shedding in foals or dams during hospitalization remains unclear. The objectives of this study were to determine the prevalence of fecal shedding in mare-foal pairs and to compare detection using isolation and a commercial real-time polymerase chain reaction (qPCR) for toxin A and B genes in feces. Foals and their mares admitte...
Correction: Phenylbutazone concentrations in synovial fluid following administration via intravenous regional limb perfusion in the forelimbs of six adult horses. [This corrects the article DOI: 10.3389/fmed.2026.1810077.].
Vietnam’s Horse Sector: A Comprehensive Review of History, Production Systems, Health Challenges, and Research Priorities. Horses in Vietnam have a long historical presence and continue to hold economic, socio-cultural, and medicinal importance across diverse regions. Despite these roles, comprehensive scientific information on equine development, including health and disease patterns, reproductive performance, genetic resources, and biomedical applications, remains limited and fragmented. In this review, we summarize existing knowledge on equine populations, production systems, and their development in Vietnam, as well as their roles in cultural practices, livelihoods, and traditional medicine. We then identify m...
Straight sesamoidean ligament desmopathy commonly occurs with proximal interphalangeal joint osteoarthritis. Proximal interphalangeal joint osteoarthritis (PIPJ OA) is a common cause of poor performance in the equine athlete; however, the supporting soft tissue structures surrounding the joint are seldom evaluated. Straight sesamoidean ligament injuries have been previously hypothesised to be concomitant with PIPJ OA; however, the frequency of these lesions coinciding with PIPJ OA has not been fully investigated. Objective: To investigate the prevalence of straight sesamoidean ligament desmopathy (SSLD) in horses presenting with PIPJ OA. Methods: Retrospective clinical study. Methods: Horses presenti...
[New drugs for horses and production animals in 2025]. In 2025, no novel pharmaceutical agents for horses and farm animals were introduced to the German veterinary drug market; however, the use of 2 existing active ingredients was expanded to include additional animal species. A dexamethasone preparation is now approved for use in goats, and a new product containing sodium salicylate for chickens was introduced. Oxalic acid dihydrate is now available as an impregnated strip for contact treatment. In the field of immunological veterinary medicines, a vaccine against epizootic hemorrhagic disease virus in cattle was approved for the first time. In a...
Genetic Diversity in Domestic Horses: Temporal Patterns, the Influence of Assisted Reproductive Technologies, and Implications for the American Quarter Horse. Genetic diversity is the heritable variation within and among populations and is essential for the long-term health and selection potential of domestic horses. Previous studies show diversity across breeds is shaped by effective population size, founder events, artificial selection, and levels of inbreeding. While some closed-studbook breeds retain moderate genetic diversity, others have experienced rapid losses due to popular-sire effects and recent and extensive inbreeding. Even so, mare lines continue to help maintain genetic diversity within these populations. Assisted Reproductive Technol...
Improving Inclusivity in the Curriculum via the Introduction of an Equine Industry-Specific Language eGlossary. The equine veterinary profession is frequently considered inaccessible to veterinary students who have had limited exposure to the equine industry. One of the perceived reasons for this inaccessibility is the use of what is often coined "horsey" language within the industry. If a student has limited experience of the equine industry, there is a potential language barrier to teaching, which may result in poor engagement with equine teaching and placements. The aim of this Teaching Tip is to describe the development and evaluation of a new teaching resource designed to demystify equine industry-...
Diagnosis of bacteraemia in neonatal foals using 16S rRNA high-throughput sequencing. Sepsis is an important cause of morbidity and mortality in foals. Early diagnosis can improve outcome but is complicated by non-specific clinical signs and delayed confirmation of infection via blood culture. Molecular assays represent a rapid and more sensitive alternative. Objective: To evaluate and compare bacterial load and composition in blood and blood culture media (BCM) of sick and healthy foals using molecular assays and to compare results with traditional bacterial culture. Methods: Cross-sectional observational clinical study. Methods: Thirteen septic foals, 10 sick non-septic and 8...
A point-based laminitis risk scoring system and machine learning framework for prediction of laminitis in horses. Laminitis is a painful and potentially life-threatening inflammatory condition of the equine hoof, and its detection remains a major challenge in veterinary practice. Although several risk factors have been reported, the prediction of the onset of laminitis in a subclinical stage using routine clinical data is still limited. This study aims to address this gap by developing an interpretable machine learning (ML) framework for the prediction of the risk of laminitis in horses. A point-based risk scoring system was first constructed using multivariate logistic regression to quantify the contribu...
Identification of Genomic Differences Resulting from Selection in Iranian Kurdish and Turkmen Horse Breeds Using Single Nucleotide Polymorphisms. Breakthroughs in genomic technologies have enabled the formulation of methods to identify genomic variation in domestic animal species. Detection of the variation is necessary because it is associated with breed characteristics and economic importance in domestic animal genetics. Unassigned: This study aimed to identify the genomic regions in Turkmen and Kurdish horse breeds that have been the target of different selections over many years. It also sought to locate the genes and Quantitative trait loci (QTL) in these regions that contributed to the differentiation of these two breeds or the di...
Determining optimal practices for foal weaning – A protocol for a systematic review and network meta-analysis. Weaning is a stressful time in a foal's (Equus caballus) life. As humans artificially manage weaning in domestic horses, it provides an opportunity to safeguard horse welfare early in life, with potential long-term benefits. While numerous studies have examined the effects of different weaning and management interventions on foal stress, optimal weaning practices have yet to be identified. Overall purpose of the study: To identify which weaning interventions and management practices have the greatest potential to improve foal welfare based on physiological and behavioural outcomes. Research qu...
Using a wearable electrocardiogram (ECG) patch adapted for 7-day monitoring in the horse. Arrhythmias can cause poor performance and sudden death in horses. Long-term (>24 h) electrocardiogram (ECG) monitoring has been used to identify arrhythmias in humans and is superior to short-term monitoring for transient arrhythmia detection. Televet is the current equine gold-standard ECG device. The Cardea SOLO™ (CS) is a single-use monitor with automated ECG analysis software allowing ECG monitoring for 7 days. Objective: Our objective was to validate the performance of the CS compared to the Televet. Methods: Method validation. Methods: ECGs were performed on 12 healthy horses s...
Prevalence of insulin dysregulation in a sport horse population as determined by traditional and stall-side testing. The prevalence of insulin dysregulation (ID) has not been investigated in sport horses. Stall-side insulin assays offer convenience but need further validation. Objective: To determine the prevalence of and risk factors for ID in a sport horse population using an oral sugar test (OST) and assess agreement between stall-side and validated laboratory assays for insulin quantification. Methods: Prospective cross-sectional study. Methods: One hundred eighty sport horses presenting for orthopaedic evaluation at a university hospital (N = 140) or local farms (N = 40) were tested for ID using...
Orchiectomy in horses: closed technique and primary closure of the incision. To provide a video tutorial on how to perform equine castrations using the closed technique and primary closure of the skin. Unassigned: Intact male horses presented to equine veterinary hospitals for castration. Unassigned: The closed castration technique was performed with incisions over the inguinal rings and primary closure. Unassigned: This technique is associated with minimal complications, decreased edema, less pain, lower infection rates, and faster healing. Unassigned: The technique presented in this video tutorial provides a quick and safe method for removing descended as well as non...
Comparative clinical and thermographic responses to dexamethasone and saline solution mesotherapy in horses with spinal disorders. Back pain and spinal dysfunction in horses are multifactorial conditions frequently associated with musculoskeletal alterations that may impair mobility, performance, and welfare. Mesotherapy has emerged as a minimally invasive adjunctive approach for managing musculoskeletal disorders; however, comparative clinical responses to different intradermal protocols in equine spinal conditions remain insufficiently investigated. The present study aims to compare the clinical and thermographic responses of two mesotherapy protocols in horses diagnosed with cervical or thoracolumbar spinal disorders. ...
Dental disorders are associated with minimal synovial changes in the temporomandibular joint in horses. Dental disorders have been proposed as factors contributing to temporomandibular joint (TMJ) discomfort in horses, but objective evidence linking these conditions to synovial fluid alterations remains limited. This study evaluated whether the severity of dental abnormalities influences the physicochemical and cytological characteristics of TMJ synovial fluid and whether occlusal adjustment induces measurable synovial changes over time. Unassigned: Thirty-three horses were assigned to mild, moderate, or severe dental abnormality groups. Synovial fluid was collected bilaterally from the discotem...
Umbilical vein marsupialization in foals-short literature review. Umbilical remnant infections are common in neonatal foals and may involve one or more umbilical structures. Diagnosis relies on thorough clinical examination, ultrasonography, and hematologic evaluation. Standard care includes broad-spectrum antibiotics, with surgical resection if conservative therapy fails. Omphalophlebitis may extend to the liver, prompting consideration of umbilical vein marsupialization. Surgery is performed in dorsal recumbency with a fusiform incision around the umbilicus. The umbilical arteries and urachus are ligated and transected, with partial cystectomy when indicat...
Detection of equine parapoxvirus in the stable environment during pastern dermatitis outbreak in Finland. Equine parapoxvirus (EqPPV) has emerged as a cause of recurring pastern dermatitis outbreaks in horses in Finland. First detected in 2013, EqPPV has since been associated with potentially hundreds of clinical cases and suspected zoonotic transmission. Based on serological data and field reports, EqPPV causes pastern dermatitis outbreaks in Finland every few years. This study aimed to investigate the environmental presence and plausible transmission dynamics of the virus to prepare for future outbreaks and give targeted guidelines to stable staff and veterinarians. Results: After a large-scale ...
Risk factors for post-partum colic in a population of UK and Irish Thoroughbred broodmares. Broodmares are at increased risk of gastrointestinal colic. However, colic risk factors specific to this population have not been investigated. Objective: To investigate horse- and management-level risk factors for post-partum colic in a cohort of Thoroughbred broodmares in the United Kingdom and Ireland. Methods: Prospective, nested case-control study. Methods: Twenty-nine Thoroughbred stud farms in the United Kingdom and Ireland were recruited, and 1044 mares were followed over the 2021 and/or 2022 foaling seasons. Data were collected on signalment, medical and management history for post-pa...
Cell-Type Deconvolution of Equine BALF RNA-Seq: A Critical Comparison with Matched Single-Cell Data. Bulk RNA sequencing (RNA-seq) averages signals across heterogeneous cell populations. Computational deconvolution methods aim to infer cell type composition and cell type-specific gene expression from bulk data, but their performance in equine samples has not been evaluated. In this study, we assessed the ability of computational deconvolution to recover cellular composition and differential expression signals in bronchoalveolar lavage fluid (BALF) from horses with severe equine asthma (SEA) and controls (CTL). Cryopreserved BALF samples from six SEA and five CTL horses previously analyzed b...
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