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Effects of Repeated Monopolar Pulsed Capacitive Radiofrequency Energy Treatments on Mechanical Nociceptive Thresholds and Skin Temperature in Show-Jumping Horses with Thoracolumbar Pain. This study evaluated the effects of repeated monopolar Capacitive Resistive Electrical Transfer (CRET) therapy on mechanical nociceptive thresholds (MNT) and skin surface temperature in horses with perceived chronic thoracolumbar pain. Fifteen show-jumping horses were enrolled in a randomized sham-controlled clinical trial. Ten horses received treatment, and five underwent a sham procedure. Five treatment sessions were performed at 72 h intervals using a monopolar capacitive radiofrequency device operating at 500 kHz. Mechanical nociceptive thresholds (MNT) were assessed before treatment, afte...
Factors influencing veterinary student interest in equine practice in the United States: A focus group study. The number of new veterinary graduates entering equine practice in the United States continues to decline, and more than half leave the field within 5 years. Understanding the perspectives of veterinary students is critical for developing interventions that promote retention and long-term career satisfaction in equine medicine. Objective: To explore what factors influence veterinary student interest in and commitment to equine practice using the Conservation of Resources (COR) Theory as a guiding framework. Methods: Qualitative descriptive study using semi-structured student focus groups. Me...
[Determination of 33 non-steroidal anti-inflammatory drug residues in horse urine by QuEChERS-ultra performance liquid chromatography-tandem mass spectrometry]. Non-steroidal anti-inflammatory drugs （NSAIDs） are often used to treat horses' injuries and pain due to long-term training and competitions. In equestrian competitions， NSAIDs do not affect the upper limit of a horse's athletic ability， but they can enable the horse to perform close to its maximum capacity by reducing inflammation and pain. This not only affects the competition results， but also fails to ensure the health and welfare of the horses. Therefore， it has become crucial to effectively monitor and control NSAIDs residues during equestrian competition. In this study， a r...
Warmed intravenous fluid administration attenuated a reduction in body temperature in anaesthetised horses. Peri-anaesthetic hypothermia is a well-documented complication of general anaesthesia and is associated with prolonged recovery, impaired wound healing, and delayed coagulation. Fluid warmers can be used to mitigate heat loss, but there is little evidence supporting their effectiveness in equine anaesthesia. Objective: To determine whether administration of warmed intravenous fluids attenuates heat loss during general anaesthesia in horses. Methods: Prospective, randomised, crossover in vivo experiment. Methods: Six healthy adult horses were anaesthetised twice and administered intravenous flu...
Disorders of Calcium in Horses and Foals. Disorders of calcium homeostasis are frequent in equids with acute and chronic disorders. These animals may have abnormal phosphorus concentrations. Prompt identification and treatment are central for a positive outcome. A basic understanding of calcium regulation facilitates the diagnosis and treatment of calcium dysregulation. In horses, hypocalcemia is more often associated with acute conditions linked to systemic inflammation (eg, sepsis, gastrointestinal diseases), although hypocalcemia is also a feature of hypoparathyroidism and acute kidney injury. Magnesium supplementation should be co...
Thyroid Diseases. Thyroid hormones in horses fluctuate with factors like time of day, diet, activity, or medications. True hypothyroidism is rare in adults, and other causes for the observed clinical signs, such as equine metabolic syndrome, should be considered. Hyperthyroidism can occur in older horses and is sometimes associated with clinical signs requiring surgical treatment. In neonatal foals, distinct forms of hypothyroidism are associated with dysmaturity and can be life-threatening. While thyroid supplementation can help in managing equine metabolic syndrome, inappropriate use can impair athletic perfo...
Scintigraphic Characteristics of the Occipitoatlantoaxial Region in Clinically Sound Horses. The equine occipitoatlantoaxial (OAA) region is biomechanically complex, yet normative scintigraphic reference data for this area are lacking. This retrospective study characterized the physiological radiopharmaceutical uptake pattern in the OAA region of 60 clinically sound horses, assigned equally into four age groups: under 6 years (Group A), 6-10 years (Group B), 11-15 years (Group C), and over 15 years (Group D). A standardized, semiquantitative analysis of lateral bone-phase scintigrams was performed using region of interest (ROI) ratios to determine uptake patterns. A highly consist...
Correlation of 2D Linear and 3D Volumetric Measurement Techniques for Subchondral Bone Sclerosis in the Equine Distal Limb Using Standing Computed Tomography. Subchondral bone sclerosis of the distal third palmar/plantar metacarpal/metatarsal condyles is a common radiographic finding in Thoroughbred racehorses. Traditionally, assessment has relied on two-dimensional (2D) linear measurements; however, advances in imaging software now allow three-dimensional (3D) volumetric quantification of subchondral bone. This study aimed to assess the relationship and agreement between computed tomography (CT)-derived 2D linear and volumetric measurements of condylar sclerosis and computer-generated 3D volumetric measurements and determine whether 2D measurements...
Modified technique for resection of the alar folds to nasal paralysis in a mule: Case report. Equids are obligate nasal breathers. Therefore, conditions that obstruct or impair this respiratory route can compromise animal welfare by causing severe respiratory distress, while also impacting athletic potential. Nasal paralysis results from injury to the facial nerve and its branches and is characterized by the lack of movement of the alar cartilage, leading to nasal collapse. Its occurrence is uncommon in horses and has not been previously reported in mules. This report describes a 9-month-old mule presented with a history of facial trauma and compression caused by a halter. After unsucc...
Five Domains, Multiple Realities: A Multidimensional Analysis of Equine Welfare in Equestrian Events in Brazil. Welfare assessments at traditional equestrian events in Brazil are scarce. This study aimed to systematize and stratify assessments based on the Five Domains (5DMs) model into subdomains (sDMs) for vaquejada and gait events and to adapt them to reflect local conditions and resource availability. Subsequently, the sDMs were classified and scored on a 5-level scale (1 to 5, where 1 = very poor and 5 = excellent), and assessments were conducted at three vaquejada and five gaited horse competitions. Assessments took place during morning, afternoon, and evening periods over two or more days and wer...
Diagnostic Accuracy of Scintigraphy for Detecting Morphological Variation of the Sixth Cervical Vertebral Ventral Lamina in Horses: A Retrospective Study. Morphological variations or transposition of the ventral lamina of the sixth cervical vertebra (C6) are well documented in horses. Radiography remains the primary modality for identifying these osseous variations, whereas scintigraphy provides a functional assessment of bone activity; however, its diagnostic accuracy for this condition has not been established. This retrospective single-center study evaluated the diagnostic performance of scintigraphy compared with radiography for detecting C6/C7 ventral laminar anomalies and determined an optimal C6:C7 uptake ratio cutoff. Thirty-four horses ...
Hypothalamic-pituitary-adrenal Axis Dysfunction in Critically Ill Foals and Horses. Critical illness-related corticosteroid insufficiency is a transient dysfunction of the hypothalamic-pituitary-adrenal axis, leading to inadequate cortisol responses during severe stress from endotoxemia and sepsis in horses and foals. This condition is associated with poor outcomes, and its diagnosis is complicated by interindividual variability in cortisol response. Recent advances in dynamic testing and point-of-care hormone tests offer promise for better assessment and treatment, enabling more precise steroid replacement therapy in affected equine patients.
Equine Metabolic Syndrome and Insulin Dysregulation. Equine metabolic syndrome (EMS) is defined as a collection of metabolic and clinical features that contribute to the development of hyperinsulinemia-associated laminitis (HAL). Insulin dysregulation (ID) is the hallmark feature of EMS and a risk factor for development of HAL. There are several diagnostic tests that can be used to diagnose various forms of ID in horses and ponies. Treatment of EMS/ID includes providing an appropriate diet, exercise program, and pharmacologic intervention in some severe cases.
Endocrine Disorders and Their Effect on Equine Reproduction. Continuing the reproductive potential of aged horses is a request many equine practitioners may receive. Reproductive performance may be impacted by a host of age-related comorbidities such as the endocrinopathies, pituitary pars intermedia dysfunction, and equine metabolic syndrome. While limited information is known, reproductive effects described may include irregular estrous cycles, development of anovulatory follicles, increased incidence of uterine infection, or generalized infertility. Accurate diagnosis, management strategies, and monitoring remain critical for improving quality of lif...
Characterization of the Healthy Ocular Mycobiome of Purebred Lusitano Horses Using Oxford Nanopore Long-Read Sequencing. The ocular surface represents a unique microbial ecosystem continuously exposed to environmental microorganisms; however, the fungal component of the healthy equine ocular microbiome remains poorly characterized. This study aimed to characterize the ocular surface mycobiome of 12 clinically healthy Purebred Lusitano horses from three geographical regions in Portugal kept in two housing systems using Oxford Nanopore long-read sequencing and conventional fungal culture. Sequencing revealed a highly diverse fungal community with marked inter-individual variability. The most abundant genera were ,...
Human-horse interactions as complementary strategies for mental health promotion. Animal-assisted interventions (AAI) represent complementary rehabilitative approaches designed to address a range of physical and mental health conditions. Among these, Equine-assisted interventions (EAI) offer structured opportunities for engagement through diverse activities conducted within naturalistic settings, thereby integrating therapeutic processes with ecological contexts. Methods: Over the past years, our group has developed and implemented standardized AAI methodologies that are now embedded within comprehensive intervention planning. This overview summarizes the application of dif...
Use of a caudal intercostal block in horses undergoing surgery for colic. In humans and companion animals, regional anaesthesia is used in multimodal analgesic protocols for abdominal wall surgery. Benefits include earlier patient mobilisation and improved pain scores. Regional anaesthetic techniques for horses undergoing abdominal surgery could provide similar benefits and warrant investigation. Objective: To evaluate the safety and efficacy of a caudal intercostal block for abdominal surgery (CIBAS) in horses undergoing surgery for colic. Methods: Blinded, randomised clinical trial. Methods: Horses (n = 22) undergoing exploratory celiotomy for colic were rando...
Correction: Development of an indirect ELISA for the detection of venezuelan equine encephalitis virus specific antibodies in horses. [This corrects the article DOI: 10.1371/journal.pone.0338819.].
Improving sport horse selection using machine learning: Early prediction of elite-level show jumping performance. Early identification of sport potential in show jumping horses remains challenging because competition outcomes vary widely, and elite-level performance develops after considerable time. In this study, we evaluated the applicability of machine learning approaches to competition records from horses identified through FEI participation, complemented by national-level records from Sweden, Belgium and France, with the aim of identifying horses likely to reach elite performance. Performance data from Fédération Équestre Internationale (FEI) competitions were analysed using an Extreme Gradient Bo...
Equine alveolar echinococcosis: a focus on epidemiology, clinical and pathological features, and diagnostics. Here, we review equine alveolar echinococcosis (AE), focusing on its epidemiology, clinical and pathological features, and diagnostic challenges, through comparisons with AE in other host species. AE is a zoonotic disease caused by the larval form of the tapeworm. Horses are considered dead-end hosts, in which AE infection can be detected at slaughter, highlighting their potential as sentinel animals in endemic areas. Equine AE is typically asymptomatic and is generally only found incidentally during meat inspection or necropsy. Standard diagnosis involves histopathology and conventional poly...
Mutual wellbeing in an equine-assisted intervention: experimental evidence for the two-way hypothesis and the importance of interaction method. Rising rates of mental health disorders have increased demand for scalable, non-pharmacological interventions. Interactions with animals can improve emotional wellbeing across diverse populations, yet the mechanisms responsible for these benefits remain poorly understood. Most research focuses on human outcomes while treating the animal as a passive component of the interaction, despite human-animal interactions being inherently reciprocal. We therefore propose the Two-Way Hypothesis, which predicts that human behavior shapes animal behavior, which in turn contributes to variation in human emo...
Genome-wide exploration of coat color-associated loci in Hokkaido Native Horses, with a novel locus implicated in the roan phenotype. Genes and loci regulating horse coat color have been investigated in many breeds, but their associations with the 16 coat colors of the Hokkaido Native Horse (HKD) remain unknown. HKDs were classified according to coat-color groups based on pedigree-recorded coat color, and genome-wide association (GWA) analyses were performed. Except for gray and roan, a clear single signal corresponding to the known locus was obtained for each coat color, suggesting that the reported loci are the primary causes of these coat colors. Because gray and roan are difficult to distinguish visually and may therefor...
Effects of sympathomimetic agents on heart rate variability during general anesthesia in Thoroughbred horses. Heart rate variability (HRV) is widely used as a noninvasive index of autonomic nervous system activity. The objective of this study was to determine whether the administration of sympathomimetic agents alters HRV indices during general anesthesia in Thoroughbred horses. Five healthy Thoroughbred horses were anesthetized with sevoflurane in oxygen. During 2-5 hr of general anesthesia, five treatments were administered to each horse in a randomized order. Two doses (µg·kg·min) of epinephrine (0.1 and 0.5), norepinephrine (0.5 and 1), dobutamine (1 and 5), dopamine (5 and 15), and saline (as ...
Seroprevalence of Borrelia burgdorferi sensu lato in horses in Spain. Borrelia burgdorferi sensu lato is a tick-borne zoonotic pathogen of increasing importance in Europe, responsible for Lyme borreliosis and affecting both humans and domestic animals. In horses, infection is often subclinical and difficult to diagnose due to variable clinical presentation and limitations in diagnostic methods. Epidemiological data remain limited in several countries, including Spain. This study aimed to estimate the first nationwide seroprevalence in horses in Spain and to identify associated risk factors. A total of 716 serum samples from clinically healthy horses across 17 au...
Clinical Signs as an Indication of the Presence of Gastric Ulcers in Horses: True or False? Equine Gastric Ulcer Syndrome (EGUS) and its related diseases, Equine Squamous Gastric Disease (ESGD) and Equine Glandular Gastric Disease (EGGD), can be found in horses worldwide, with increased prevalences in racehorses and animals subjected to heavy training loads. Clinical signs of the disease are vague and nonspecific, and most horses affected by the disease are asymptomatic. In this retrospective study, our aim was to determine the percentages of pleasure and breeding horses showing signs compatible with gastric ulcers, and to correlate these signs with the presence of ESGD, EGGD, and bo...
Historical, clinical and nasal endoscopic findings in 1600 cases of equine sinonasal disease and associations with case outcome. No large study has described the signalment, pre-referral management or clinical and nasal endoscopic findings in equine sinonasal disease. Objective: To explore associations between case outcome and signalment, pre-referral treatments, clinical and nasal endoscopic variables in sinonasal disease. Methods: Retrospective case series. Methods: Data were collected from medical records of 19 equine hospitals on sinonasal disease cases they had examined and which had undergone computed tomographic (CT) imaging. Case outcome was obtained from clinical records and/or by contacting clients and referri...
Musculoskeletal Assessment of Forelimbs and Hindlimbs in Mounted Police Horses using Infrared Thermography. Infrared thermography (IRT) has become established as a complementary tool in equine veterinary medicine, allowing for the early detection of thermal changes associated with musculoskeletal inflammatory processes. Objective: This study aimed to apply infrared thermography to characterize the surface thermal profile of the forelimbs and hindlimbs of mounted police horses, considering clinical classification, anatomical region, body side, and repeated evaluations over time. Methods: The research was conducted at the Military Police Cavalry in Manaus (AM), Brazil, involving 20 adult horses submit...
Oocyte and Embryo Vitrification in Horses. Vitrification has emerged as a decisive technique in assisted reproductive technology, offering superior cryopreservation outcomes for both oocytes and embryos compared with traditional slow freezing. This chapter provides a comprehensive overview of the vitrification of equine oocytes and embryos, emphasizing the influence of technical factors, including cryoprotectant selection, exposure time, temperature control, and device volume, on vitrification outcomes. Biological factors such as the oocyte maturation stage, the presence of cumulus cells, and embryo size are also explored, highlighting...
Context-aware machine learning for lameness side and severity prediction in trotting horses: A proof-of-concept study. In clinical practice, lameness evaluation often relies on visual assessment under different examination conditions, including ground and figures, and remains subjective. Although objective symmetry indices provide quantitative measures of gait asymmetry, their interpretation across multiple conditions remains challenging because several complementary indices are required and their thresholds vary with context. Objective: To assess the ability of a context-aware machine learning approach to predict lameness side and severity at the trot using trunk-mounted IMUs. Methods: Retrospective observati...
Coprological assessment of gastrointestinal helminths in Arabian Thoroughbred horses housed in a stable in the Constantine region, Algeria. This study assesses the gastrointestinal parasitological status of Arabian Thoroughbred horses at the Eastern Equestrian Club in Constantine (Algeria). In this semi-arid region, epidemiological data on equine parasitoses are lacking. Twenty fecal samples were analyzed using qualitative (flotation) and quantitative (McMaster) methods, complemented by morphological identification of parasitic eggs. The results reveal an overall prevalence of 50 %, with species diversity dominated by strongyles (60 % of positive cases), followed by (40 %), spp. (30 %), (20 %), and spp. (10 %). The excretion i...
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