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An epizootic of equine viral arteritis at a Thoroughbred racetrack in Illinois: 223 cases. An epizootic of equine viral arteritis (EVA) occurred over an 8-wk period in the summer of 1993 at a midwestern Thoroughbred (TB) racetrack that ceased operations in 2021. Based on clinical signs, viral isolation, and serology, 223 horses (213 TBs, 10 lead ponies) were affected. Consistent clinical signs included fever (38.3-40.6ยฐC; 101-105ยฐF), depression, inappetence, and diffuse urticaria, including distal limb and preputial edema. Equine arteritis virus (EAV) was cultured from buffy coat samples from 24 of 28 acutely ill horses. Seventeen of 18 convalescent horses and 1 of 92 non-affected...
A 12-year review of equestrian related injuries at a major trauma centre in South Africa. Few studies on equestrian-related injuries have specifically focused on patients in South Africa. The aim of this study was to review the spectrum of injuries and of patients treated at state-funded trauma centres in South Africa. Methods: A retrospective study was conducted over a 12-year period from July 2012 to February 2025 on all patients treated for equestrian-related injuries. Results: A total of 82 patients were included (83% male, median age: 17 years, median injury severity score (ISS): 9). The most common mechanism of injury was a fall ( = 41), followed by a kick ( = 38). Two were t...
A wild rice byproduct as an alternative to wood sawdust for equine bedding: a pilot study evaluating effects on stall air quality. Minnesota is a major producer of cultivated wild rice, generating a straw byproduct that may serve as an alternative bedding material for horses. This study compared wild rice straw (WRS) and wood sawdust (WS) for water absorptive capacity (WAC), muck production, suspended particulate matter (PM), and ammonia concentrations. In a crossover design (n = 4), horses were assigned to WRS or WS for 5 d before switching treatments for an additional 5 d. Horses were stalled overnight. Daily muck production was recorded, WAC was evaluated over 24 h, and PM and ammonia concentrations were measured withi...
Comparison of Two Different Finite Element Modeling Pipelines for Virtual Mechanical Testing of The Distal Third Metacarpal Bone In Thoroughbred Racehorses. Condylar stress fracture of the third metacarpal bone (MC3) in Thoroughbred racehorses is a common catastrophic injury and identification of horses at heightened risk remains subjective. Standing computed tomography (sCT) is a practical screening tool that enables patient-specific finite element analysis (FEA) of the distal MC3 and prediction of subchondral bone strain, as a potential objective classifier of racehorses at heightened risk. The goal of this study was to compare two independently developed sCT-based subject-specific FEA pipelines for virtual mechanical testing of the distal MC3. ...
An intronic variant in Ferredoxin Reductase (FDXR) creates a cryptic exon in Quarter Horses with Equine Juvenile Spinocerebellar Ataxia. Equine Juvenile Spinocerebellar Ataxia (EJSCA) is a novel autosomal recessive neurologic disease in Quarter Horses. Affected foals display a progressive proprioceptive ataxia by 1-5 weeks of age, leading to recumbency and necessitating euthanasia. Whole genome sequencing was performed on 7 EJSCA cases and unaffected horses that included 4 obligate carriers, 4 unaffected half or full-siblings, and 28 unrelated, unaffected control Quarter Horses. An 82 kb region of association was identified (EquCab3.0, chr11: 6963986-7045999), containing 9 candidate SNPs across four genes (FADS6, FDXR, GRIN2C a...
Use of strain and shear wave elastography in the ultrasonographic evaluation of the intermediate patellar ligament in horses: comparison and consistency of data. The clinical significance and ultrasonographic features of intermediate patellar ligament (IPL) desmopathy in horses are still debated and considered nonspecific. Elastosonography allows assessment of tissue elasticity in response to an external stimulus. The aim of the study was to describe the elastosonographic characteristics of the equine IPL, evaluate the feasibility of both strain (SE) and two-dimensional shear wave elastography (2D-SWE), and assess the consistency of the data obtained from these techniques. 20 adult horses of mixed breed, sex and athletic use were selected and allocated...
Myofascial trigger points as a primary cause of equine lameness: a biomechanical, neurophysiological, and fascial review. Equine lameness diagnosis is dominated by a joint- and tendon-centric paradigm. The standard diagnostic algorithm relies on gait observation, perineural and intrasynovial anesthesia, and cross-sectional imaging. It is directed almost exclusively at skeletal and articular structures. Myofascial trigger points (MTrPs) are hypersensitive, hyperirritable loci within taut bands of skeletal muscle. They produce local and referred pain on compression or contraction. In horses, MTrPs are a clinically relevant but systematically overlooked source of primary lameness. This review synthesises evidence fr...
Ultrasound guidance aids in determining the success of equine temporomandibular joint arthrocentesis. The equine temporomandibular joint (TMJ) is divided into two non-communicating joint (discotemporal DTJ and discomandibular DMJ) compartments. Ultrasound has been extensively used as a diagnostic tool in the horse, but previous work has reported that ultrasound-guidance did not improve the success rate of TMJ arthrocentesis. However, this research focused only on the larger, easily accessed, DTJ compartment. However, most of the osseous pathology of the equine TMJ has been reported to be in the smaller DMJ. Unassigned: To determine whether using ultrasound-guidance would reduce the number of a...
Comparison of cost for conventional embryo transfer versus intracytoplasmic sperm injection. There are obvious practical advantages of both conventional ET and ICSI. One question that has not been addressed adequately, however, is the relative cost of each procedure and if there is a cost advantage of one over the other. Objective: The objective of the present study was to obtain additional cost data from clinics and breeding farms that perform both ET and ICSI. Methods: A request was sent to 10 clinics that performed either just OPU or OPU/ICSI. These facilities were representative of reproductive specialists located all across the United States. Six clinics provided information on a...
Protective effects of adiponectin receptor agonists against equine lamellar endoplasmic reticulum stress. Lamellar endoplasmic reticulum (ER) stress occurs in hyperinsulinemia-associated and sepsis-related laminitis. Adiponectin is associated with reduced laminitis risk and inhibits ER stress in other species. Objective: To induce ER stress in ex vivo equine lamellar cells using pharmacological agents. To determine whether co-treatment with adiponectin receptor agonists (ARAs) reduces ER stress. Methods: In vitro. Methods: Lamellar cells from nโ=โ4-5 horses were treated with tunicamycin or thapsigargin (10-1000โnM) for 2-24โh. ER-stressed cells were co-treated with full-length adiponectin ...
Farm Atmosphere: Calm Attention and Mobility Characterise Positive Horse Welfare. On-farm welfare assessment of equines is a challenge given the large diversity of management practices, especially in terms of housing and activities. In our study, we tested time budget measures as a complementary tool to more conventional welfare indicators (e.g., stereotypic behaviours, ear position while foraging, neck shape). We observed 174 horses living in eight facilities (in their home environment) for which data on management practices and welfare were available. Time budget was assessed using the scan sampling method (1 min scan sampling over 30 min; 33 scans), while welfare assessm...
Bronchoalveolar lavage changes the ultrasonographic and radiographic appearances of lungs in adult horses. To describe the effect of bronchoalveolar lavage (BAL) on the ultrasonographic and radiographic appearances of lungs of horses being evaluated for equine asthma syndrome (EAS). Unassigned: Prospective observational study enrolling 32 adult horses evaluated for EAS. Ultrasonographic and radiographic examinations of the thorax were performed before and within 3 hours following BAL and scored using previously validated systems. The differences in scores between groups (normal, mild EAS, moderate/severe EAS) were evaluated through the Kruskal-Wallis test, and the differences in scores before and f...
Evaluation of Circadian Variations of Central Corneal Thickness and Its Correlation With Intraocular Pressures in Healthy Horses. Circadian variations in central corneal thickness (CCT) and their correlation with intraocular pressure (IOP) have not been reported in horses. This information may be clinically relevant when interpreting IOP readings. Methods: Twenty-four eyes of 6 healthy adult gelded males and 6 healthy adult intact mares were evaluated. Rebound tonometry (TonoVet, Jorgensen Laboratories) followed by ultrasonic pachymetry (iPac Pachymeter, Reichert technologies) was performed in both eyes every 3โh over 24โh during the natural 14-h daylight summer photoperiod. Results: Central corneal thickness varied ...
Effects of acupuncture on stride, speed, and heart rate variability in Thoroughbred racehorses. Thoroughbred racehorses are at increased risk of injury during race preparations and trials, primarily due to intensive workloads that predispose them to musculoskeletal injuries. Evaluating clinical interventions to improve health and prevent injury is essential for addressing animal welfare concerns. This study investigated the medium-term effects of acupuncture on stride, speed and cardiac autonomic regulation (assessed via heart rate variability [HRV]), in Thoroughbred flat racehorses. This prospective, randomised, parallel-group study included an intervention and a control group. Thirty T...
Growth kinetics of Taylorella equigenitalis and its survival in straw-based bedding. Taylorella equigenitalis, the causative agent of contagious equine metritis, is a fastidious bacterium with limited tolerance to extra-host conditions; however, quantitative data on its growth dynamics and survival outside the host remain scarce. This study evaluated the growth of T. equigenitalis under aerobic and microaerophilic conditions in liquid medium and its survival in wet and dry straw-based bedding under controlled laboratory conditions.Growth was assessed at 20ย ยฐC and 37ย ยฐC using real-time optical density monitoring and viable cell counts. No proliferation was observed at 20ย ย...
Venous blood lactate concentration as a predictor of intestinal viability in horses with acquired indirect inguinal hernia. Background: Acquired indirect inguinal hernia represents a life-threatening emergency. Therapeutic decision-making largely depends on intestinal viability, for which specific predictive parameters (such as venous lactate) have not been evaluated.Objectives: Investigating the predictive performance of venous blood lactate and other laboratory results on intestinal viability in horses with acquired indirect inguinal hernias.Study designRetrospective multicentre observational study.Methods: Seventy-four horses diagnosed with acquired indirect inguinal hernia (treated surgically) at two referral h...
Effects of supplementing concentrates with different energy levels on growth performance, blood indicators, and fecal microbiota of Mongolian horses in late gestation. Horse breeding and management have a globally extensive history, with horses serving vital roles in transportation, warfare, agriculture, and cultural activities. In China, particularly in Inner Mongolia, the horse industry faces challenges such as harsh winters and limited nutritional research for local breeds, especially during late gestation. This critical period is essential for fetal development and maternal health, and inadequate nutrition can lead to complications like nutritional abortions and poor foal growth. Similar issues exist worldwide in cold climates or regions with seasonal pa...
Equine arteritis virus Nsp10 promotes MAVS proteasomal degradation via E3 ligases Smurf1/MARCH5. Equine arteritis virus (EAV) is a positive-sense, single-stranded RNA virus that belongs to the family , which also includes porcine reproductive and respiratory syndrome virus (PRRSV). EAV is the causative agent of equine viral arteritis (EVA), an economically important systemic, reproductive, and respiratory disease of equids. EAV infection triggers host innate immunity, yet the precise strategies employed by the virus to evade immune defenses and achieve productive infection are poorly characterized. In this study, it was observed that EAV infection can induce a cellular IFN response; howev...
Verminous mastitis caused by Cephalobus cubaensis infection in a mare. A 7-y-old American Quarter Horse mare was presented to a veterinary hospital for ongoing reproductive monitoring and management of endometritis. During physical evaluation, several nodular lesions of unknown origin and duration were discovered in the mammae. Histologically, biopsies from the lesions were confirmed as severe granulomatous mastitis with intralesional rhabditid nematodes. A putative diagnosis of or infection was assigned, and ivermectin (1.2โmg/kg PO) treatment was given every 2โwk. When lesions persisted after the initial dose of ivermectin, PCR testing of and gene targe...
Radiographic and Morphological Prevalence of Dorsopalmar Hoof Distortions in in Brazilian High-Performance Racehorses. Although racehorses represent a dominant segment in equine industry, there are growing concerns regarding injury prevention, with hoof conformation increasingly recognized as a contributing factor. Objective: To morphologically and radiographically evaluate the forelimb digits of racehorses at the Sรฃo Paulo Jockey Club in order to determine the prevalence of dorsopalmar hoof distortions and to compare morphological and radiographic methods for assessing the hoof-pastern axis. Methods: The forelimb digits of 59 thoroughbred horses aged 3 to 4 years were evaluated using standardized photographi...
Identification of gene conversion events in horse IGHV suggests preferential hotspots for diversification. The humoral immune response relies on a diverse antibody repertoire, which is expanded through processes such as somatic hypermutation, class-switch recombination and gene conversion. These processes are primarily mediated by activation-induced cytidine deaminase (AID). Gene conversion generates diversity in immunoglobulin heavy and light chains (IGHVs) in species such as chickens and rabbits, though it has not been widely studied. Since 80% of the equine IGHV repertoire originates from only three functional gene segments, we examined gene conversion events in horses to assess their role in an...
Establishment and evaluation of hematological and serum biochemical reference intervals in Chinese local donkey populations. Background: Reliable interpretation of hematological and serum biochemical test results in donkeys benefits from the use of population- and management-system-adapted reference intervals (RIs). However, standardized and CLSI-compliant RIs for Chinese local donkeys are still unavailable, limiting their clinical and epidemiological application. This study aimed to establish hematological and serum biochemical RIs for Chinese local donkeys using a large, multi-farm dataset, and to evaluate the effects of farm origin, age, and sex on these parameters. Blood samples were collected from healthy donke...
Risk assessment of West Nile fever in equines in Europe based on an ecological niche model. West Nile fever is a zoonotic viral disease transmitted by Culex mosquitoes, capable of causing severe neurological illness in humans, equines, and birds. Over the past dozen years, Europe has experienced numerous WNF outbreaks of varying severity, leading to significant public health and economic impacts. Consequently, WNF has emerged as a major concern for both public health and veterinary sectors. In this study, we employed spatiotemporal analysis techniques alongside an optimized ecological niche model to investigate the spatiotemporal distribution patterns of historical WNF outbreaks, pre...
Conventional IVF in the horse past, present, and future: physiological and technical insights. For decades, conventional in vitro fertilization (IVF) in the horse was ineffective, leading to reliance on intracytoplasmic sperm injection (ICSI) for both research and clinical in vitro embryo production. However, the ability to achieve IVF is essential to the study of key reproductive processes, including sperm capacitation, fertilization, and early embryonic development. Recently we have established a repeatable and efficient IVF system for horses, using long-term (9-22 h) sperm pre-incubation. For clinical use, IVF has many features that may support higher embryo quality than does ICSI, a...
Synchronization dynamics between rider and saddle motion across gaits revealed by IMU analysis. Effective rider-horse coordination is essential for performance and welfare, yet objective, field-based quantification of rider-saddle synchronization across gaits remains limited. Objective: To quantify dynamic synchronization between rider motion and saddle motion (as a proxy for horse trunk oscillations) across walk, trot, and canter using a minimal inertial measurement unit (IMU) setup, and to determine whether synchronization differs between rider body segments. Methods: Two experienced riders (8-20 years riding experience) rode their own or familiar warmblood horses (n = 2; age 6-14 year...
The effect of dynamic mobilization exercises and therapeutic trunk exercises on superficial epaxial and hypaxial muscle activity in horses. Equine back rehabilitation commonly integrates dynamic mobilization exercises (DME), including DME to the chest (DMEChest) and DME to the hip (DMEHip), and therapeutic trunk (TTE) exercises, including pelvic rounding (Rounding), and lateral tail pulls (LatTail). However, limited evidence supports their use for selectively activating trunk muscles. Objective: To quantify and compare superficial epaxial and hypaxial muscle activity during selected DMEs and TTEs using surface electromyography (sEMG). Increased muscle activity was hypothesized across exercises, specifically in external abdominal o...
Transcriptomic and Proteomic Analysis of the Skeletal Muscle Revealed the Effects and Mechanism of Mulberry Leaf Flavonoids on Alleviating Exercise-Induced Muscle Damage in Mongolian Horses. The scientific evidence regarding the use of plant-derived extracts to alleviate exercise-induced muscle damage in horses remains limited. Mulberry leaf flavonoids (MLFs) are the primary bioactive constituents of a traditional medicinal plant and are potent antioxidants. The aim of this study was to investigate the protective effects of MLFs against exercise-induced muscle damage. In this study, twelve Mongolian horses were used in a 3 ร 3 Latin square design to investigate the protective effects of MLFs. Our results showed that high-intensity exercise negatively impacted the immune status, m...
Functional and feasibility aspects of orthopedic exoprostheses in quadruped domestic animals: a systematic review. The use of prostheses in animals with partial limb amputation has emerged as an alternative to euthanasia, aiming to improve their quality of life. However, the fabrication and adaptation remain challenging in Veterinary Medicine. This study aims to evaluate, through a systematic review, the determinants of viability, outcomes, and limitations of exoprostheses in domestic animals of varying sizes. A literature search was conducted in ScienceDirect, PubMed, Scopus, Web of Science, and Google Scholar using structure search terms related to prosthesis, veterinary, amputation. After screening and ...
Genetic diversity of Dermacentor nitens (Acari: Ixodidae) collected on horses from western Cuba. The tropical horse tick, Dermacentor nitens Neumann, 1897, has a wide distribution throughout the Neotropics, and is a vector of protozoan haemoparasites that cause equine piroplasmosis. Despite this, little is known about the genetic diversity of this tick species, particularly in Cuba, where horses are important domestic animals used in agriculture and for transportation. The objective of this study was to assess the magnitude of genetic variation in 115 D. nitens adults (57 females and 58 males) collected from horses in the Cuban province of Mayabeque using sequence data of two mitochondria...
Possible Effects of C-Reactive Protein in the Central Nervous System During Venezuelan Equine Encephalitis Virus Infection. Venezuelan equine encephalitis virus (VEEV) is an alphavirus vectored by mosquitos. It can cause disease in equines and humans characterised by a febrile illness that may progress into encephalitis. Replication of VEEV in the central nervous system induces activation of glial cells and neurons, compromising the blood-brain barrier (BBB) and inducing a state of neuroinflammation. This inflammation can lead to symptoms such as confusion, seizures, and coma, and sustained inflammation contributes to neurodegeneration. C-reactive protein (CRP) is a biomarker that has previously been associated wit...
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