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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...
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)...
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...
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...
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...
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 ...
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...
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...
Trendelenburg positioning with or without norepinephrine infusion for haemodynamic support in anaesthetised hypovolemic horses. Intraoperative haemorrhage during equine anaesthesia is a rare but potentially fatal complication requiring prompt haemodynamic support. Postural manoeuvres such as Trendelenburg (TL) positioning and vasopressor support augment venous return and improve cardiac output (CO), yet their efficacy in anaesthetised hypovolemic horses remains unstudied. Objective: To evaluate haemodynamic effects of TL positioning during normovolemia and acute haemorrhagic hypovolemia, and to determine whether concurrent norepinephrine (NE) infusion enhances cardiovascular stabilisation. Methods: In vivo experiments....
Exploring the relationship between inhibitory control and coping behaviour in horses. The ability to flexibly adapt to the demands of a stressful situation is a key factor in successful coping. Appropriate coping is of critical importance in artificial environments, which may include novel and potentially stressful situations. Being able to inhibit immediate but counterproductive reactions, and thus exert inhibitory control, might allow to better adapt to the environment. Horses are required to flexibly adapt to various housing conditions and training techniques; however, not all horses successfully cope as evidenced by the prevalence of stereotypical behaviours. We tested 31 m...
Standing computed tomographic tenography is reliable in identifying soft tissue lesions within the digital flexor tendon sheath in horses. To determine the diagnostic performance of standing computed tomographic tenography (CTT) in detecting naturally occurring intrathecal lesions of the superficial digital flexor tendon (SDFT), deep digital flexor tendon (DDFT), manica flexoria (MF), and in identifying palmar/plantar annular ligament (PAL) desmitis and constriction in horses undergoing tenoscopy. Methods: Retrospective observational study. Methods: Client-owned horses of various breeds and use, median age of 12.5 years (range: 6-20 years). Methods: A total of 24 horses with inconclusive ultrasonographic and contrast tenograp...
Efficacy of an Oral Chondroprotective Joint Supplement on Stride Length and Gait Symmetry in Aged Geldings with Chronic Lameness. Oral joint supplements (OJSs), specifically those containing glucosamine and chondroitin sulfate, are some of the most popular feed additives fed by horse owners. However, evidence of the efficacy of these nutraceuticals in vivo is lacking. To investigate the impacts of an OJS on equine lameness, 40 geldings (18 ± 7 yr) with chronic lameness and AAEP lameness grades between 2 and 4 (as scored by a veterinary sports medicine and rehabilitation specialist) were enrolled in the study. Horses were stratified by lameness grade, BCS, and weight, and then randomly assigned to receive a placebo powde...
Toll-like receptor 3-activated allogeneic umbilical cord blood-derived mesenchymal stromal cells as an adjunct for the treatment of synovial sepsis in 3 horses. To describe the case presentation, treatment, and outcome of horses treated with Toll-like receptor 3 (TLR-3)-activated allogeneic umbilical cord blood-derived mesenchymal stromal cells (CB-MSCs). Unassigned: 3 horses presenting with chronic or antimicrobial-resistant (AMR) septic synovitis. Unassigned: All horses presented with clinical signs associated with septic synovitis including marked grade 4/5 lameness, joint effusion, heat/swelling of the limb, and synovial fluid parameters consistent with sepsis. Case 1 presented 3 weeks following the onset of clinical signs. Cases 2 and 3 developed...
Klossiella equi, an underreported parasite of equids in the Americas. Klossiella equi Baumann, 1946 (Apicomplexa: Coccidia) is a globally distributed adeleorinid parasite that infects the kidneys of equid hosts. Considered an uncommon parasite, when K. equi is detected, it is typically an incidental finding during histologic examination of the kidneys as part of routine necropsy. In the present study, kidney was collected opportunistically from 3 different equine populations: 1) routine necropsies at the Ontario Veterinary College (OVC; n = 48); 2) natural mortalities from the Sable Island wild horse herd (n = 25); and 3) routine necropsies of animals fr...
Abdominal palpation per rectum is highly sensitive for identifying small versus large intestinal lesions in horses presenting for colic. To describe the sensitivity, specificity, predictive values, and accuracy of abdominal palpation per rectum in horses treated surgically for colic. Unassigned: Medical records were gathered over 5 years (2019 to 2024). Findings of abdominal palpation per rectum were collected and compared to surgical diagnosis, and cases were categorized as true or false positive and negative. Signalment, physical examination parameters, hematologic values, and years of examiner experience were recorded. Unassigned: Records of 453 horses were included. Overall sensitivity and positive predictive value were 86%...
Multivalent Disabled Infectious Single Animal (DISA)-DIVA vaccine for all nine serotypes of African horse sickness virus (AHSV) is broadly protective in IFNAR (-/-) mice. African horse sickness (AHS) is a highly severe, midge-borne disease of equids showing a mortality rate of > 90% in naive domestic horses. Outbreaks are caused by AHS virus (AHSV) and result in devastating economic losses in developing countries as equids play a crucial role in the agricultural industry and many households. The AHSV species encompasses nine serotypes showing no or limited cross protection, which is challenging regarding AHS vaccine development. Recently, and like bluetongue virus (BTV), the AHS Disabled Infectious Single Animal (DISA)-DIVA vaccine platform was developed...
Transcriptome Sequencing and Differential Analysis of Testes in One- and Two-Year-Old Kazakh Horses. This study systematically elucidated the developmental characteristics and molecular regulatory mechanisms of the testis during the critical period of sexual maturation in Kazakh horses by combining histological observation of one- and two-year-old testicular tissues with transcriptomic sequencing. In the testes of one-year-old horses, no obvious lumen was observed, and the interior is mainly comprising supporting cells and spermatogonia on the basement membrane; in contrast, in the testes of two-year-old horses, the tubular lumen was complete with spermatogonia, spermatocytes, and spermatozoa...
Erythrocyte sequestration of metformin in horses: impact on matrix-specific pharmacokinetics and detection windows. BACKGROUND: Metformin is used for the treatment of type 2 diabetes and is one of the most prescribed medications in human medicine. It is less commonly prescribed in equine medicine, and its use is tightly regulated in several performance horse disciplines. In horseracing, it is considered a banned substance. A previous pharmacokinetic study of metformin in horses demonstrated a prolonged, unpredictable elimination phase. In the current study it was hypothesized that this was due to sequestration of metformin in a “deep” compartment, specifically red blood cells. This could result in pharm...
Comparative Morphological and Proteomic Characterization of Adipose Tissues from Different Anatomical Sites in Yili Horses. Adipose tissue functions not only as a primary energy reservoir but also as a metabolically active endocrine organ. However, the morphological and molecular differences among adipose depots from different anatomical sites in Yili horses remain unclear. This study aimed to compare the morphological characteristics and proteomic profiles of subcutaneous adipose tissue (SAT) and pericardial adipose tissue (PCAT). To this end, adipose tissue samples from 18 Yili horses were analyzed using hematoxylin and eosin (H&E) staining, while a subset of samples from 6 horses was subjected to proteomic a...
Antibacterial use in Norwegian horses: a nationwide registry-based cross-sectional study. BACKGROUND: Antibacterials are essential for treating infections in horses, but the use contributes to antimicrobial resistance (AMR), which threatens animal and human health. Despite these concerns, antibacterial use in horses has not been systematically studied and described in Norway, and nationwide registry-based analyses in other countries are scarce. The aim of this study is to describe antibacterial use in Norwegian horses, 2022–2024, by analysing nationwide registry data, with a particular emphasis on gynecological and obstetrical conditions. In addition, we will evaluate the data qu...
Integrative Phosphoproteomic Profiling Reveals Stage-Specific Signalling and Metabolism in Equine Melanocytic Neoplasm. Equine melanocytic neoplasms (EMN) are aggressive tumours characterised by high metastatic potential and limited therapeutic options available. However, the molecular mechanisms underlying their progression remain poorly understood. This study therefore presents the integrative phosphoproteomic analysis of EMN tissue, with the aim of elucidating stage-specific alterations in signalling pathways and metabolism. Nineteen tissue samples from grey horses were categorised as normal-stage (n = 6), early-stage EMN (n = 7), and severe-stage EMN (n = 6) and subjected to in-depth analysis us...
Presurgical acetone and chlorhexidine aseptic preparation of the equine hoof lowers bacterial counts below surgically acceptable threshold. The objectives were to determine whether topical applications of acetone and 4% chlorhexidine following removal of the superficial hoof wall reduces tissue bacterial load below 5 log10 microorganisms per gram (CFUs/g) of tissue and whether Dey-Engley neutralizing broth (DENB) neutralizes residual chlorhexidine in vitro within equine hoof tissue samples. Unassigned: In a clinical prospective study with a total of 24 hooves, the superficial hoof was mechanically removed followed by disinfection with acetone and 5-minute rough and aseptic preparations with 4% chlorhexidine. Dorsal wall, frog, and...
Influence of riders’ physical activity on improving seat balance in the context of horse welfare – A pilot study. This study aimed to investigate the impact of gym exercises for riders on their posture and the subsequent effect on reducing discomfort for their horses during training, using electronic pressure sensors. The study involved 20 warmblood horses aged 5-10 years, regularly ridden under saddle, and four riders of similar height and body weight. The study group was divided into a control group (10 horses) and an experimental group (10 horses). The horses were trained 5 days a week for 60 days in total. Riders trained three times a week for approximately 60 minutes. The exercises were designed to i...
Deep digital flexor tenotomy provides pain relief and clinical comfort in horses with chronic laminitis. This study evaluated the clinical application, outcomes, and prognostic indicators of deep digital flexor tenotomy (DDFT) in horses with chronic laminitis. Unassigned: A computer-generated search identified all possible cases of laminitis for horses referred to the George D. Widener Hospital for Large Animals at the University of Pennsylvania between 2010 and 2022. Medical records were reviewed for a diagnosis of laminitis by clinical examination and radiographs. The population was characterized by breed, age, clinical features, and radiographic findings. Poisson regression was performed to id...
Age-Associated Differences in Paddock Locomotor Activity Among Senior Horses: A Pilot Observational Study. Turnout locomotor activity is a potentially informative indicator of health and welfare in older horses, yet objective field data in seniors remain limited. We examined whether a brief turnout recording could detect cross-sectional associations between chronological age and locomotor activity in senior horses in this study setting. In this single-site observational study, 28 senior Selle Français horses (17-35 years) contributed 122 paddock sessions (2 h each), with total distance and mean speed quantified using a Polar Team Pro sensor. Associations with age were assessed using linear mixed-e...
Exploratory evaluation of equine placental extract supplementation on ageing indicators in geriatric dogs: a single-arm pre-post study. BACKGROUND: Recent advances in preventive veterinary healthcare, nutritional management, and owner engagement have extended the longevity of domestic dogs. However, this increased lifespan has led to a higher prevalence of age-associated physiological and functional decline. Equine placental extract contains a variety of bioactive constituents, with reported antioxidative and anti-inflammatory properties. Although the use of equine placental extract in veterinary practice is expanding, empirical evidence supporting its effects on ageing-related clinical outcomes in dogs remains limited. In thi...
Interleukins decrease epithelial protein and gene expression by K14 + CD105+ equine hoof progenitor cells. Background: Progenitor cell epithelial to mesenchymal transition (EMT) could impact healing in the epidermal-dermal junction of the equine hoof stratum internum (SI). The hypothesis of this study was that K14 + CD105+ equine hoof SI progenitor cells assume a mesenchymal phenotype in the presence of inflammatory interleukins in vitro.Methods: K14 + CD105+ progenitor cell percentages isolated from proliferative scarred (fibrous) and healthy SI were quantified. Decellularized matrix was prepared from and K14 + CD105+ cells localized in healthy SI. Gene expression (CD44, CD105, E-cadhe...
Persistence of Sarcocystis neurona and histopathology in horses with equine protozoal myeloencephalitis. Currently, little is known about the exact role of immunopathology in equine protozoal myeloencephalitis (EPM), including the ability to persist after anti-protozoal treatment. The main objectives of this study were to determine whether is present in the CNS in horses with EPM, including previously treated cases, and to evaluate the associated histopathology and immune response. For this study, control ( = 10) and horses with EPM ( = 9) were confirmed based on our inclusion criteria. Based on our preliminary data, we classified horses with EPM and clinical signs for >6 months as...
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