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Survey of rider and horse size proportions and associated rider perceptions. The influence of a rider's size on equine performance and welfare remains a topic of debate in the equestrian industry. Most previous research has examined the weight ratios of riders and horses in controlled experimental settings, and the existing perceptions of acceptable rider-horse unit proportions have not been investigated. Objective: The aim of this study was to investigate horse and rider size and skill proportions among Finnish horses and riders. The study also investigated riders' perceptions of the acceptability of these size proportions. Methods: Riders over 18 years of age were in...
Intraoperative monitoring and anaesthetic complications in horses: A secondary analysis of the CEPEF4 multicentre cohort. CEPEF4 provides the most comprehensive contemporary dataset on perianaesthetic risk in horses. Intraoperative complications, monitoring and American Society of Anesthesiologists (ASA)-stratified associations with death remain incompletely described. Objective: To describe monitoring and complication incidence, assess associations with ASA physical status, and compare ASA-stratified mortality by complication status. Methods: Secondary analysis of a prospective, multicentre cohort study. Methods: Data from 47,371 equine general anaesthetics were analysed. Monitoring was described overall and by ...
Analgesic use, safety and pharmacokinetics of acetaminophen in equids: A structured scoping review. Despite its frequent use in equine clinical practice, scientific data on the use of acetaminophen in horses remain limited. Objective: To map and critically appraise the available evidence on the analgesic use, safety and pharmacokinetics of acetaminophen in horses. Methods: Structured scoping review. Methods: A comprehensive search was performed in accordance with the PRISMA Extension for Scoping Reviews using the terms '(paracetamol OR acetaminophen) AND (pain OR safety OR toxicosis OR pharmacokinetics) AND (horse OR pony OR donkey OR mule)' across Web of Science, Scopus, and PubMed from dat...
Ethical monitoring of ovum pick-up procedures in domestic horses: A standardised self-assessment checklist for responsible veterinary practice. Assisted reproductive technologies (ARTs) have the potential to accelerate genetic improvement in selective equine breeding programmes while addressing specific reproductive challenges. One recent assisted reproductive technique in domestic horse breeding is Ovum Pick-Up combined with Intracytoplasmic Sperm Injection (OPU-ICSI). Despite their advantages, the implementation of these new procedures, like more established breeding methods, raises ethical concerns relating to aspects like animal welfare, staff safety, professional and veterinary practice integrity, which must be monitored and asse...
Equine herpesvirus myeloencephalopathy-associated mutations in equine herpesvirus 1 DNA polymerase confer the ability to replicate at elevated temperatures. Equine herpesvirus myeloencephalopathy (EHM), caused by equine herpesvirus type 1 (EHV-1), poses a major threat to the equine industry because of its devastating impact on animal welfare and athletic performance. A single-nucleotide polymorphism (SNP), G2254, in ORF30 (UL30), which encodes the viral DNA polymerase, has been used as a marker of neuropathogenic EHV-1 strains, although its contribution to EHM pathogenesis remains controversial. In addition, other ORF30 SNPs have been reported in association with EHM, but their functional significance is unclear. Clinical observations indicate tha...
Preliminary evaluation of beta-endorphin alone and in combination with adrenocorticotropic hormone for the diagnosis of pituitary pars intermedia dysfunction in equids. Limited published data exist regarding the diagnostic utility of beta-endorphin (β-END) for pituitary pars intermedia dysfunction (PPID), either compared with or in combination with adrenocorticotropic hormone (ACTH). Objective: To evaluate β-END as a potential diagnostic test for PPID in comparison with ACTH and to explore the diagnostic performance of combined tests. Methods: Ninety-eight equids aged 19-32 years, owned by the foundation "Stiftung für das Pferd," were included. Methods: A cross-sectional study was conducted in January 2025. Haircoat abnormalities were scored as absent, mi...
Multi-Detector Helical Computer Tomography, Transrectal Ultrasonography and Histology of the Lumbosacral Area: A Comparative Study in Warmblood Horse Cadavers. Pain arising from the lumbosacral region is a recognized cause of poor performance and impaired welfare in horses. However, structural changes in the intertransverse joints (ITJs), lumbar articular process joints (APJs), and lumbosacral intervertebral discs (LSDs) may also occur in asymptomatic horses, complicating interpretation of imaging findings.This study evaluated these structures in 14 middle-aged Warmblood cadavers that were not lame according to the owners prior the onset of the problem that resulted in euthanasia or slaughter and correlated ultrasonographic (US) and computed tomograp...
Hormonal, clinical, and survival outcomes in horses and ponies diagnosed with pituitary pars intermedia dysfunction in primary care practice. Variables associated with hormonal, clinical, and survival outcomes of equids with pituitary pars intermedia dysfunction (PPID) are incompletely investigated. Objective: Evaluate the effect of initial hormone concentrations, clinical signs, treatment, and owner-related variables on outcomes in horses and ponies with PPID. Methods: Medical records from 213 horses and ponies diagnosed with PPID by 2 university-based primary care practices. Methods: Analytical observational cohort study. Variables associated with adrenocorticotropic hormone normalization, clinical improvement, and survival after ...
Depth and distribution of colonic sand accumulation in a desert population of horses and its association with diagnosis of sand colic. To describe patient and management characteristics associated with radiographic sand accumulation in a desert population of horses, as well as identify factors independently associated with a diagnosis of sand colic and need for surgical intervention. Unassigned: Horses were prospectively allocated into 3 groups: control horses, horses with sand colic, and horses with non-sand-associated colic. Signalment, radiographs, and management outcomes were compared between groups. Unassigned: Median depth of sand was significantly greater in horses diagnosed with sand colic compared to other groups (11...
Allele frequencies of 7 inherited disorders in performance and random cohorts of American Quarter Horses (2020-2024). To estimate allele frequencies for genetic diseases in the American Quarter Horse (QH), including hyperkalemic periodic paralysis (HYPP), type 1 polysaccharide storage myopathy (PSSM1), malignant hyperthermia (MH), myosin-heavy chain myopathy (MYHM), glycogen branching enzyme deficiency (GBED), hereditary equine regional dermal asthenia (HERDA), and equine juvenile spinocerebellar ataxia (EJSCA), and to compare these frequencies over time among elite performance subgroups and a random cohort of registered horses. Unassigned: In this prospective genetic survey, DNA was extracted from 300 elite ...
Microbiological, Molecular Diagnosis and Antimicrobial Resistance of Bordetella bronchiseptica in the Equine Reproductive Tract in Brazil. The genus Bordetella comprises 16 species of aerobic Gram-negative bacteria, with the most notable being B. pertussis, B. parapertussis and B. bronchiseptica. The latter stands out for its ability to infect various hosts, causing both respiratory and reproductive issues, such as endometritis and infertility in mares. These infections impair reproductive efficiency and facilitate the spread of the pathogen among susceptible animals. Objective: The present study aimed to report the isolation and molecular diagnosis of B. bronchiseptica associated with endometritis and infertility in mares in Bra...
Relationship Between Feed Olfactory Exploration and Consumption in Horses. The aim of the study was to evaluate the relationship between horses' behaviour during olfactory exploration and following consumption of the same food containing herbs, either previously exposed to the herb odour or not. Twenty horses' responses to 14 herbs were compared in a smelling test, when the horses sniffed a herb, and after 20 min a consumption test, when they consumed oats mixed with the same herb. Before the tests, the horses were exposed to the scent of seven herbs, whereas the remaining seven herbs were non-pre-exposed. The results show that horses consumed oats with herbal additi...
Challenges for interpreting results of antimicrobial susceptibility testing for treating infections of foals with Rhodococcus equi. Rhodococcus equi is a facultative intracellular pathogen and a major cause of pneumonia in foals worldwide. The standard treatment for affected foals is a combination of a macrolide with rifampicin. The widespread use of this combination has led to the emergence of multidrug-resistant (MDR) strains of R. equi. Consequently, antimicrobial susceptibility testing is essential for guiding treatment of rhodococcal pneumonia. Unfortunately, clinical breakpoints for macrolides and other antimicrobials against R. equi for foals are lacking, thereby complicating clinical interpretation of in vitro resu...
Ostium-specific equine pulmonary vein myocardial sleeve gross anatomy and structural evidence of interatrial myocardial continuity with potential implications for ablation strategies. Pulmonary vein (PV) myocardial sleeves (MSs) harbour an arrhythmogenic substrate for atrial fibrillation. However, equine-specific data on MS distribution and wall thickness are limited yet essential for developing ablation strategies. In humans, posterior interatrial connections can compromise right-sided PV isolation. Objective: To study equine PV MS distribution, quantify ostial/branch diameters, antral lengths, characterise MS distal edge morphology, measure wall thickness and explore an interatrial myocardial continuity between the MSs of caudal branches draining through ostium III (PV II...
Adaptive variation in butyrylcholinesterase-influenced lipid metabolism during horse domestication. Lipid metabolism influences horse athletic performance, yet its genetic basis remains unclear. Here, we investigate the genetic basis of lipid metabolic traits by quantifying key metabolic parameters and sequencing the genomes of 298 horses. We identify a missense mutation (ECA19:9,198,989, G>C) in the BCHE gene that is strongly associated with lipid metabolism, especially butyrylcholinesterase (BChE) activity. The "C" allele is associated with increased BChE activity and reduced intracellular triglyceride levels, hepatic adiposity, and overall fat mass, highlighting a central role for BCHE in...
Osteosynthesis of bilateral, displaced incisive bone fracture in a horse. A nine-year-old Trakehner mare was presented three days after an episode of severe epistaxis, showing intermittent foul-smelling nasal discharge with feed material and rostral displacement of the upper incisor teeth. Radiographic and computed tomography examinations revealed a complete comminuted fracture of the right side and an oblique complete fracture of the left side nasal processes of the incisive bone and maxillary bone, as well as open fractures of the nasal septum and palatine bone with displacement of the incisor part rostrally and development of an oronasal communication. The fractu...
[Puncture wounds of the equine hoof – a retrospective study of 96 cases – Part 2: Management and prognosis]. Puncture wounds are a common and potentially life-threatening injury in equine veterinary practice. The aim of this study was to systematically analyze data from horses presenting to the clinic with a puncture wound. Unassigned: A retrospective study was conducted on patient data from horses with a puncture wound in the period from September 2008 to August 2024. Analyzed data included medical management and surgical treatment, complications, duration and costs of hospitalization, short-term survival rate and treatment success. Unassigned: A total of 96 horses met the inclusion criteria. Seven ...
Comparative analysis of the karyotypes of Equus caballus and Equus asinus in the context of contemporary genomic data. Karyotypes of species within the genus Equus display considerable variation in chromosome number and are characterised by numerous structural rearrangements that have played a pivotal role in their evolutionary divergence and speciation. Equus caballus (horse), 2n = 64 and Equus asinus (donkey), 2n = 62, constitute particularly interesting models for comparative studies due to the diversified morphology of their chromosomes, including acrocentric and submetacentric pairs, documented Robertsonian translocations, and centric fusions. In recent decades, widely applied molecular cytogenetic techni...
Disorders of Water and Tissue Perfusion (Diabetes Insipidus, Renin-Angiotensin-Aldosterone Axis, and Anhidrosis). This review highlights disorders of water and tissue perfusion in equids, specifically diabetes insipidus, the renin-angiotensin-aldosterone axis, and anhidrosis. The differences in renal versus central diabetes insipidus is discussed, as well as diagnosis and treatment of diabetes insipidus in equids. The physiology of the renin-angiotensin-aldosterone axis is reviewed, and recent research in the role of the renin-angiotensin-aldosterone axis in equids in certain states is emphasized. The proposed pathophysiology of anhidrosis in horses is discussed, as well as potential therapies.
Mesenchymal stem cells in veterinary clinical practice: Evidence from naturally occurring diseases. Over the past two decades, the use of mesenchymal stem cells (MSCs) in veterinary medicine has expanded rapidly, although the clinical evidence remains in its early stages. This review discusses clinical studies involving client-owned animals with naturally occurring diseases in which MSCs or MSC-derived extracellular vesicles (EVs) were used as treatments. It covers musculoskeletal disorders, including osteoarthritis, tendon and ligament injuries, and bone diseases; soft-tissue and oral mucosal conditions; neurological disorders; ophthalmic diseases; and internal medicine disorders, such as i...
Effects of pulsed electromagnetic therapy on the major hematological and biochemical parameters in horses. Pulsed electromagnetic field (PEMF) therapy, a commonly used supplementary treatment in the horse industry, shows promise in enhancing circulation, reducing inflammation, and supporting cellular repair; however, its effects on equine physiology remain unclear. Limited research and inconsistent protocols create uncertainty about its efficacy and safety in horses. Our study evaluates the short-term effects of PEMF on hematological and biochemical parameters in horses. Five active sport horses underwent PEMF therapy for five consecutive days using a full-body blanket at specific frequencies. Bloo...
Alpha-2-Macroglobulin-Enriched Plasma Modulates Inflammatory and Proteolytic Pathways in Experimental Equine Musculoskeletal Models. Joint inflammation and extracellular matrix degradation are major contributors to the development of equine osteoarthritis and reduced athletic performance. Alpha-2-macroglobulin is a naturally occurring broad-spectrum inhibitor of proteases and inflammatory mediators that has emerged as a promising orthobiologic therapy. This study investigated the anti-inflammatory and matrix-protective effects of alpha-2-macroglobulin-enriched plasma in complementary in vitro and ex vivo equine models. Primary equine chondrocytes and synoviocytes isolated from healthy horses were stimulated with interleukin...
Epidemiological study of strongyle infections in equines in Egypt: prevalence and risk factors. Equine strongylosis is one of the most prevalent gastrointestinal parasitic diseases affecting horses and donkeys worldwide, leading to reduced health, productivity, and working performance. This study aimed to determine the prevalence of gastrointestinal strongyle infection and identify associated risk factors among equines in three Egyptian governorates. Unassigned: A cross-sectional study was conducted on 540 horses and donkeys. Fresh fecal samples were collected and examined using the magnesium sulfate flotation technique for the detection of strongyle eggs. Associations between infection ...
Guttural pouch tympany or empyema in 38 ٍStraight Egyptian Arabian foals: clinical presentation, diagnostic features and outcome. As a breed, Straight Egyptian Arabian horses are susceptible to many disorders that mostly affect the head, such as guttural pouch (GP) tympany and empyema. This retrospective study evaluated the findings of clinical examination, ultrasonography, endoscopy, laboratory analyses and outcome of treatment of 38 Straight Egyptian Arabian foals with GP tympany and empyema. Methods: Data from medical records of foals diagnosed with GP tympany or empyema over a 2-year period (2024-2025) were reviewed. Foals with verified GP tympany or empyema who had complete medical records and had not previously rec...
Genetic variants of EcPV2 E6 and E7 in equine genital and oronasal squamous cell carcinoma. Since its discovery in 2008, equine papillomavirus type 2 (EcPV2) has been detected in up to 100% of equine genital and up to 40% of equine oronasal squamous cell carcinomas (SCCs). Preliminary sequence data point to the existence of EcPV2 E6 and E7 oncogene variants compared to the British reference sequence from 2008. Objective: To Identify E6 and E7 sequence variations in EcPV2-positive tumours of horses from Continental Europe and Iceland. Methods: Cross-sectional study. Methods: EcPV2 E6 and E7 were amplified from DNA of 60 EcPV2-positive SCCs/SCC precursor lesions. Amplicons were gel-pur...
A color-coded atlas of the cortical surface anatomy of the equine brain. The horse has a highly gyrencephalic cerebrum; however, detailed references of equine cortical surface anatomy remain limited, and terminology inconsistencies continue to complicate comparative, clinical, and educational applications. This research focused on creating a standardized, high-resolution, color-coded atlas of equine brain sulci and gyri, based on the Nomina Anatomica Veterinaria (NAV). Unassigned: Brains from ten neurologically normal horses were examined. Following fixation and dissection, the sulci and gyri of the lateral, dorsal, rostral, and medial surfaces were documented, col...
Transforming retraining: Supporting racehorses to have successful second careers. Optimizing long-term welfare outcomes for Thoroughbred racehorses following retirement from racing is a priority across the global horse racing industry. Following their racing career, horses are required to adapt to a markedly different lifestyle, involving substantial physical, behavioural, and mental adjustment. This study consulted experienced retrainers to identify factors that inform successful retraining and transition of former racehorses to promote positive lifelong outcomes beyond racing. An online survey of 100 global stakeholders experienced in retraining former racehorses explor...
From Diet to Disease: The Role of the Gut Microbiome and Microbial Metabolites in Horses. The equine gastrointestinal microbiome plays an essential role in digestion, energy metabolism, immune regulation, and maintenance of intestinal homeostasis. Increasing evidence suggests that microbial-derived metabolites provide a functional link between diet, the microbiome, and host physiology. This narrative review summarizes current knowledge on how dietary factors, including structural carbohydrates, non-structural carbohydrates, protein, and lipids, influence microbial function and metabolite production in horses. Relevant publications available up to June 2026 were identified through s...
The 3Fs as conditions of being: relational ontology and equine welfare in disaster response and reconciliation. Disaster relief work requires the collaboration of many stakeholders and can be viewed through a One Health lens, emphasising transdisciplinarity and an openness to different ways of knowing as well as an appreciation of the interdependence of human, animal, environmental health, and welfare. This perspective piece provides an autoethnographic account of a wildfire response in Western Canada in which a herd of free-ranging horses was rescued outside of conventional disaster management protocol. Through lived experience, the convergence between equine welfare, reconciliation, and relational ont...
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