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Germline Pathogenic Variant in the APC Gene Suggestive of Gardner Syndrome in a Pony. A 12-year-old pony mare was presented for evaluation of dental disease and nasal discharge. At presentation, clinical signs included bilateral nasal discharge, cutaneous masses, and numerous hard enlargements involving the bones of the skull, maxilla, mandible, and cervical vertebrae. Oral exam revealed advanced dental disease with hard enlargements adjacent to and between numerous cheek teeth. Radiographs and computed tomography confirmed the presence of severe dental disease and proliferative bone lesions disseminated along the skull, hyoid apparatus, and cranial cervical vertebrae. The bony...
Efficacy of an iron absorption test on assessing iron status in horses. Iron absorption tests (IATs) are used to evaluate iron absorption in humans. However, this testing has not been conducted in horses. Objective: The objective was to assess how a large dose of iron affects blood iron parameters during an IAT. Methods: Mixed-breed geldings (n=12) were offered 2% of their bodyweight (BW) in mixed-grass hay and an iron-free vitamin-mineral supplement. A baseline IAT (Baseline IAT) was performed, where horses received 25 milligrams per kilogram (mg/kg) of BW of iron (ferrous sulfate) orally. Jugular venous samples were taken before the iron dose, and 3-, 6-, 12-, a...
Downregulation of a choline transporter gene in equine colitis indicates a role for choline supplementation to support the large intestinal epithelial barrier. Acute colitis is an inflammatory condition of the equine colon associated with high morbidity and mortality. In these horses, epithelial barrier function is critical but the mechanisms underlying large intestinal epithelial damage and recovery are incompletely understood. Objective: Our objectives were to (1) identify intestinal colitis-associated transcriptional pathways, and (2) determine the effect of in vitro choline supplementation on the epithelial barrier. Methods: We performed RNA-sequencing on rectal biopsies from healthy and colitis horses (n=3/group). Downregulated SLC5A7, a gene en...
Application of 3D scanning for modeling and morphometric assessment of Mangalarga Marchador Horses. Morphometric traits are essential for assessing conformation, locomotion, and selection in equine breeding programs. However, manual measurements are laborious, require physical contact, and may cause stress to animals, highlighting the need for alternative technologies. Objective: This study evaluated the use of a portable 3D scanner for three-dimensional modeling and morphometric assessment of Mangalarga Marchador horses. Methods: Fifty-two adult horses were measured using manual and 3D scanning methods to assess ten morphometric traits: withers height (WH), hip height (HH), head length (HL)...
Transference of diagnostic thresholds for equine plasma ACTH from the Immulite 1000 to Immulite 2000XPi and Tosoh AIA systems. Diagnosis of PPID in horses relies on measurement of plasma adrenocorticotrophic hormone (ACTH) concentrations. Because measured ACTH values vary between analytical platforms, and published diagnostic thresholds apply almost exclusively to the Immulite 1000 chemiluminescent assay (CLA), there is a need for validated, assay-specific thresholds for contemporary analysers. This study aimed to transfer and validate established Immulite 1000 diagnostic thresholds for plasma ACTH to three contemporary systems (Immulite 2000XPi, Tosoh AIA-900, and Tosoh AIA-360) using the Clinical Laboratory Standard...
Epidemiology of open and closed diastemata in equine cheek teeth and associations with periodontal pathology. Cheek-tooth diastemata are a common dental abnormality in horses and are considered a major predisposing factor for periodontal disease. However, the influence of diastema type and anatomical location on disease severity remains incompletely understood. To determine the prevalence and distribution of open and closed cheek-tooth diastemata and evaluate their association with periodontal disease severity in horses, while assessing the influence of age, sex, jaw location and laterality, fifty equine cadaver heads obtained from an abattoir were examined. Diastemata were identified through visual a...
Case Report: Physiological Stress Responses to Repeated, Standardized Short-Distance Transport in a Transport-Experienced Horse. Transport is a fundamental component of equestrian training and competition. However, even horses with extensive transport experience may exhibit physiological stress responses during routine travel. This case report describes physiological stress responses in a transport-experienced 10-year-old Belgian Warmblood gelding subjected to repeated, standardized short-distance transport. The horse was transported on 17 occasions along a fixed route to a riding school for dressage training using the same vehicle, handler, and protocol to minimize environmental variability. Physiological stress marker...
Integrating clinical and rna-seq findings in a mare with recurrent endocrinopathic laminitis linked to equine metabolic syndrome. Equine metabolic syndrome (EMS) is characterized by insulin dysregulation and obesity, which increase the risk of the development of hyperinsulinemia-induced laminitis (HAL). The present report describes a case of severe endocrinopathic laminitis associated with EMS, refractory to treatment. A 5-year-old mare with recurrent HAL presented transient relief upon a low nonstructural carbohydrate diet and conventional therapy. An SGLT2 inhibitor was introduced to reduce resting insulin levels, and improvement was observed until October 2024, when the most severe episode started. Despite adding perg...
Complete atrioventricular septal defect in Thoroughbred foals: echocardiographic and postmortem findings. Complete atrioventricular septal defect (AVSD) is rarely reported in horses. We retrospectively reviewed three Thoroughbred foals (2017-2023) with necropsy-confirmed complete AVSD and summarized their clinical presentation, transthoracic echocardiographic findings, and postmortem anatomy. All foals showed early signs of congenital cardiac disease including weakness, failure to thrive and cardiac murmurs. Echocardiography demonstrated a common atrioventricular junction with a single atrioventricular valve and combined atrial and ventricular septal defects; all were classified as Rastelli type C...
ProAKAP4 as a predictor of semen freezability in Asturcon ponies. Cryopreservation is a valuable tool in equine reproduction, although its success remains highly variable among stallions. The proAKAP4 protein has been proposed as a molecular marker of sperm quality and cryotolerance. Objective: This study aimed to evaluate the relationship between proAKAP4 concentration and sperm cryotolerance in ejaculates from Asturcon ponies, and to assess whether proAKAP4 levels in fresh semen can predict post-thaw sperm quality parameters before and after cryopreservation. Methods: Twenty-four ejaculates from eight different stallions were used (three ejaculates per ani...
Search for Equus caballus papillomavirus type 2 in tissues of asymptomatic horses in southern brazil. Equus caballus papillomavirus type 2 (EcPV-2) has been recently associated with the development of genital squamous cell carcinomas in horses. Nevertheless, its circulation among healthy, asymptomatic horses remains poorly understood. This study aimed to investigate the presence of EcPV-2 DNA in asymptomatic horses submitted to necropsy in southern Brazil. A total of 54 horses without clinical or histological evidence of genital lesions were investigated: 40 necropsied animals and penile mucosa specimens collected from 14 horses at a local abattoir. Tissue samples were subjected to histologica...
ATAC-seq and RNA-seq reveal key genes and pathways regulating lactation in the mammary gland of Yili horses. BACKGROUND: Mammary gland development and lactation are dynamic biological processes governed by coordinated changes in chromatin accessibility and gene expression. RESULTS: We performed paired ATAC-seq and RNA-seq profiling to characterize stage-associated chromatin accessibility and transcriptional programs in the Yili horse mammary gland. Using a conservative overlap-based integration, we prioritized candidate genes showing concordant changes across both layers as hypothesis-generating signals for future functional studies. We sequenced mammary gland tissues from early lactation (S1) and pe...
Impact of evidence-based information on horse owners’ misconceptions of colic. Misconceptions can be defined as 'false, persistent beliefs' or 'inaccurate, prior knowledge' and can influence decision-making. Objective: To investigate the impact of evidence-based information on UK horse owners' decision-making for colic. Methods: Mixed-methods cross-sectional study. Methods: An online survey was distributed to UK horse owners, with four sections: owner demographics; views on decision-making and referral to an equine hospital facility for colic; current knowledge and approach to colic; impact of evidence-based information (including evidence on recognising and responding t...
Audio-Based Characterization of Gait Parameters in Mangalarga Marchador, Campolina, and Piquira Horses Using Deep Learning. The evaluation of biomechanical parameters in four-beat gaited horses remains limited by the subjectiveness and complexity of current standard methods. Through a deep learning approach, we aimed to infer dissociation % using only acoustic signals. A total of 268 audio samples were extracted from publicly available videos featuring three Brazilian horse breeds (Mangalarga Marchador, Campolina, and Piquira) performing marcha batida and marcha picada. Acoustic features, including root mean square energy (RMS), zero-crossing rate (ZCR), and 13 Mel-frequency cepstral coefficients (MFCCs), were extr...
Exercising electrocardiograms from Thoroughbred racehorses with exercise associated sudden death. Exercise associated sudden death (EASD), defined as a fatal collapse in a closely monitored and previously presumed clinically healthy horse that occurs during exercise or within approximately 1 h after exercise, is disproportionately more common in equine than in human athletes. Objective: To describe ECGs from EASD cases in Thoroughbred racehorses. Methods: Retrospective case series. Methods: An international call for potential cases was made through direct contact with relevant racing authorities requesting that trainers of horses which had experienced EASD consent to researchers gaining ac...
Equine Oocyte and Embryo Metabolism in the ART Setting: Current Knowledge and Clinical Significance. Equine in vitro embryo production has become very efficient and is used extensively worldwide for the clinical production of foals. What we know so far about offspring health and performance is promising; however, elements of the in vitro process remain unphysiological when compared to in vivo conditions. Studying the metabolism of oocytes and embryos can help inform the optimisation of culture systems and identify aberrations if they occur. Given the growing body of knowledge on the downstream effects of an inadequate peri-conception environment, both in vivo and in vitro, it is imperative th...
Effects of vatinoxan in horses sedated with detomidine and butorphanol for gastroscopy: a randomized clinical study. The peripheral alpha2-adrenoceptor antagonist vatinoxan attenuated the side effects of alpha2-adrenergic sedatives in experimental studies in horses. This clinical study investigated the effects of vatinoxan in horses sedated for gastroscopy with detomidine and butorphanol. Client-owned horses were randomly allocated to receive one of the following two intravenous treatments: detomidine hydrochloride (HCl) (12μg/kg) + butorphanol tartrate (12μg/kg) (DB; n=11) or DB + vatinoxan HCl (200μg/kg) (DBV; n=11). Borborygmi score and heart rate were recorded by auscultation. Sedation level was evalu...
Diffuse idiopathic skeletal hyperostosis in a Roman-period horse from Gerulata (Bratislava-Rusovce, Slovakia): Diagnostic Considerations. To evaluate pathological changes identified in a skeleton of a horse from Roman-period Gerulata, Slovakia. Methods: The remains consist of a partially preserved, articulated skeleton of an adult horse from today's southern urban district of Bratislava-Rusovce in southwestern Slovakia. Methods: The specimen underwent macroscopic analysis to assess taxonomic identification, biological profile, and pathological changes. Thoracolumbar lesions were further evaluated using computed tomography (CT). Radiocarbon dating determined the absolute age of the remains. Results: Species determination indicate...
Evaluation of the tolerance and effects of 1-deoxynojirimycin on insulin and glucose dynamics in healthy horses and horses at risk for insulin dysregulation. Insulin dysregulation (ID) is common and diminishes welfare of horses. Current management relies on diet and exercise, with variable responses and limited medical options. Alpha-glucosidase inhibitors (AGIs) might provide adjunctive therapy. Objective: To evaluate the tolerance and effects of Reducose®, a Morus alba leaf extract standardized to 5% 1-deoxynojirimycin (DNJ), in healthy horses and horses at risk of ID. We hypothesized DNJ would be well-tolerated and reduce insulin responses to oral sugar tests (OSTs). Methods: Twenty-seven horses: 6 healthy (Phase I), 5 at risk for ID (Phase II)...
Holding immature equine oocytes for up to 3 nights prior to ICSI under practical shipping conditions (10-22 °C) is compatible with blastocyst development. In vitro embryo production via intracytoplasmic sperm injection (ICSI) is widely used in equine reproductive management. Shipping of immature oocytes allows oocyte recovery for ICSI to be performed by referring veterinarians. However, delays in oocyte shipment are common, and their effect on outcomes is unclear. Shipping is typically done at about 22 °C, but previous studies have shown that holding at 15 °C maintains equine oocyte developmental competence. We hypothesized that lower temperatures may better support oocyte viability if the case that delays occur. Oocytes (n = 664) were rec...
Successful nutritional management of a warmblood horse with multiple pathologies that respond to nutrition. This report describes the nutritional management of an 18-year-old, 553 kg gelding warmblood used for dressage lessons that presented with severe weight loss, marked muscle atrophy, poor dentition, sabulous urolithiasis, gastric ulcers, and later small colon impaction. On admission, the diet consisted of ad libitum wheat straw and mixed cereals (73:27 forage:concentrate), providing 2% of body weight as dry matter without vitamin-mineral supplementation. Marked deficiencies were identified in digestible energy (38%), crude protein (20%), lysine, threonine, vitamins, and minerals, while sugar an...
Glanders: Past, Present and Future of a Neglected Zoonosis as a Threat in Veterinary and Human Health. Burkholderia mallei is the causative agent of glanders, a serious zoonotic disease of major concern for both animal and human health. This highly contagious and potentially fatal bacterium is always classified as a biothreat agent. In this review, we covered a comprehensive overview of glanders, including the biology of the pathogen, epidemiology, pathogenesis, diagnosis, control strategies and ongoing eradication programs in Eurasia. We also summarized human case reports, differential diagnosis, treatment and organism's antimicrobial properties. The section on vaccine development is among the...
Effectiveness of Equine-assisted Learning on Psychosocial Well-being Among Nurses. Nurse burnout poses a significant risk to workforce stability. This study investigated the impact of equine-assisted learning (EAL) on secondary traumatic stress, job burnout, subjective distress, and resiliency among nurses. Background: Effective interventions for early detection and management of stress and burnout are essential for workforce stability. Methods: Using a pre-post-interventional design, this study evaluated the impact of EAL on psychosocial well-being. Outcomes were measured using self-reported questionnaires at baseline, postintervention, and 1-month follow-up. Linear mixed m...
Autochthonous Leishmaniosis in Dogs, Cats, Horses, and Wildlife in the United States of America. Leishmaniasis is endemic in 99 countries worldwide, including the United States of America (USA). Its causative pathogens, spp. have been detected in both humans and animals within the USA. Lately, we have comprehensively reviewed autochthonous leishmaniasis in humans in this region. Animals play a pivotal role in maintaining its endemicity in some endemic areas and regions, for example, dogs in Brazil and the Mediterranean. In this review, we thoroughly examine autochthonous leishmaniosis in dogs, cats, horses, and wildlife in the USA, and we synthesize integration across species, transmissi...
Milk productivity of mares. To determine the milk productivity of Kazakh horses of the Adai region in variants of selection and technological indicators of milk for the production of cumus in the conditions of the Mangyshlak peninsula of the Republic of Kazakhstan. The object of the study was the Kazakh horse of the Adai intra-breed type at "Taushyk" LLP (Tupkaragan District, Mangystau Region). Mares with a more pronounced milk production were selected and analyzed . they have investigated the quality of milk for further processing. A characteristic feature of the dynamics of milk sugar content during lactation has been ...
Genomic diversity and structure in arabian horses revealed by whole-genome sequencing: establishment of an allele frequency database of common genetic variation. BACKGROUND: The Arabian horse is a culturally and historically influential breed that has contributed to the development of many modern horse populations. However, genomic resources for this breed remain limited, particularly population-level allele frequency datasets that support studies of genetic diversity, selection, and disease. The aim of this study was to generate a comprehensive allele frequency database for Arabian horses using representative sampling and high-coverage whole-genome sequencing. RESULTS: We generated the first publicly available allele frequency database for the Arabian...
Post exercise hydration responses to an electrolyte, glycerol, and creatine supplement in horses: a preliminary study. Electrolyte supplementation is utilized to support hydration in horses. However, limited data are available on formulations that include osmotically active compounds such as glycerol and creatine. These additional ingredients may enhance fluid retention, yet their physiologic effects in equine athletes have not been evaluated. This preliminary study assessed hematologic responses, body mass recovery, and voluntary water intake following moderate exercise with and without supplementation using a commercially available hydration supplement containing electrolytes, creatine, and glycerol. Six hea...
Social enrichment mitigates facial expressions and physiological indicators of short-term stress in horses. This study aimed to evaluate the ability of social noncontact environmental enrichment to facilitate social buffering and to characterize the emotional experience of horses subjected to restraint in stock by assessing physiological parameters and facial expressions. Pantaneiro horses (n = 11) were evaluated in a crossover design with two treatments: social noncontact enrichment during stock restraint and social isolation during stock restraint. Physiological parameters (heart rate, heart rate variability, respiratory rate, ocular temperature by infrared thermography, and auricular temperat...
Extraction of Kinematic Parameters and Comparative Study of Endurance Levels in Mongolian Horses. Mongolian horses are an indigenous Chinese breed known for their endurance capacity, yet quantitative descriptions of their gait-related kinematic characteristics remain limited. This pilot exploratory study aimed to describe the kinematics of Mongolian horses during walk, slow trot, and fast trot, and to examine whether selected variables differed between race-result groups in a 12 km endurance race. Forty-six horses were classified into an excellent group and an ordinary group based on the result of a single race. Kinematic data were collected using optical motion capture and three-dimension...
Multiple strategies, one mission: mesenchymal stromal cell-based mechanisms of action in osteoarthritis. Osteoarthritis (OA) is a cross-species, multifactorial joint disease characterized by the progressive degeneration of articular cartilage, morphological remodeling of the subchondral bone, and inflammatory and fibrotic changes of the joint capsule. These alterations arise from chronic, often subclinical, inflammatory processes and dysregulated cellular homeostasis, leading to profound shifts in the cellular and extracellular composition of the joint organ. Although the mechanisms driving persistent inflammation are only partially understood, their impact on all joint-associated tissues is well...
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