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Tick-borne pathogens in a nature reserve area in the Netherlands: serological and molecular assessments in large herbivores and Ixodes ricinus ticks. Ticks are vectors of a wide range of pathogens, relevant to both veterinary and public health. Although tick surveillance is frequently conducted in the Netherlands, data on tick-borne pathogens in free-living herbivores remains limited, leaving the impact of these pathogens on animal health poorly understood. This study aimed to characterise tick species and determine seroprevalence and infection prevalence of selected tick-borne pathogens in large herbivores at the Oostvaardersplassen nature reserve and questing ticks collected in the area. Between September 2023 and December 2024, blood was...
Evaluation of an Immunoturbidometric Assay for Measurement of Total Adiponectin Concentration in Equine Serum Samples. Total adiponectin (TA) is a marker of metabolic health in equids, with values below a critical decision point of < 7.9 μg/mL conferring increased risk of laminitis. Objective: To evaluate an IT assay to measure serum [TA] in equids and to assess its correlation with [high molecular weight adiponectin] (HMWA) measured by ELISA. Methods: Total serum adiponectin concentrations from 207 adult horses were measured using both an IT assay for TA and HMWA using a previously validated ELISA assay. Data were analyzed using Spearman correlation and Passing-Bablok regression. Intra- and inter-assa...
Growth Performance, Milk Productivity, Productive Longevity, and Milk Composition of Mugalzhar Horses. The Mugalzhar horse is an important native breed of Kazakhstan, valued for its adaptability, milk production, and meat productivity under extensive pasture-based management. This study evaluated the relationships among first-lactation milk yield, productive longevity, lifetime milk production, growth, morphometric traits, and milk composition in the Mugalzhar horse breed using data from 100 mares with complete lifetime production records, 108 adult mares and 12 stallions for morphometric evaluation, and 68 foals (35 colts and 33 fillies) for growth analysis. The study was conducted on Mugalzha...
Longitudinal and spatial declines in equine Hendra virus vaccination despite continued risk. Hendra virus is an emerging zoonosis endemic to Australia with high fatality of infection in horses and humans. The role of infected domestic horses as amplifying bridge hosts for onward transmission to humans led to the creation of an equine vaccine as a One Health solution against spillover. Despite the risk this disease represents, previously reported equine vaccination rates were low. This study explored vaccination trends between 2012 and 2023 at fine spatial scales and identified demographic and ecological predictors of vaccination against emerging zoonoses. Over 1 million doses of Equiv...
Penile and preputial pythiosis in Saudi Arabian horses: clinicopathological features and surgical outcomes. Pythiosis, caused by , is a chronic granulomatous disease of horses characterized by invasive, ulcerative, and pyogranulomatous cutaneous lesions. Involvement of the external genitalia is uncommon and remains poorly characterized, particularly regarding environmental exposure and treatment outcomes. This study aimed to describe the epidemiological pattern, clinicopathological features, diagnostic findings, and surgical outcomes of penile and preputial genital pythiosis in a hospital-presented horse cohort. Unassigned: A retrospective study was conducted on 123 horses presented with cutaneous u...
Intratumoral para-toluenesulfonamide as a tumor-ablative therapy for equine cutaneous tumors: a case series of three horses. Equine neoplasia, including sarcoids, melanomas, and squamous cell carcinomas, presents therapeutic challenges due to recurrence and limitations of conventional treatments. Para-toluenesulfonamide (p-TLS) is a tumor-ablating agent that is associated with localized tumor necrosis and subsequent lesion resolution. It has been evaluated in human clinical settings as an intratumoral treatment of malignant airway obstruction caused by non-small cell lung cancer. This study aimed to describe the clinical outcomes and tolerability of intratumoral p-TLS in equine neoplasia. Three equine cases, includi...
Unveiling wolf dietary specialization on free ranging horses using forensic genetics and field monitoring. Wolves occasionally specialize on free-ranging horses when they are abundant and alternative prey is scarce, potentially reducing horse productivity, triggering conflicts with owners, and hampering conservation of both species. Yet, ecological and demographic impacts of wolf predation on horses remain poorly understood. We investigated wolf-horse interactions in NW Portugal by combining wolf monitoring, diet analysis, spatial overlap between wolf and horse activity areas, and horse pedigree reconstruction from genetically identified individuals recovered from wolf scat remains, feeding sites a...
Evaluation of the Brix refractometer for diagnosing the failure of transfer of passive immunity in 12-h-old foals. Failure of transfer of passive immunity (FTPI) is the most important cause of sepsis and mortality in neonatal foals. Unassigned: This study aimed to evaluate the performance of the digital Brix refractometer for the diagnosis of FTPI in 12-h-old foals. Unassigned: Cross-sectional, diagnostic accuracy study. Unassigned: Jugular blood samples were collected from 124 foals at 12 ± 0.5 h after birth. IgG concentrations were estimated using a digital Brix refractometer and measured using the radial immunodiffusion test (RID). Correlation coefficients were calculated between serum Brix percentages...
Anatomopathological aspects of osteoarticular lesions associated with Rhodococcus equi infection in two foals. Rhodococcus equi is an important bacterium that affects foals up to six months of age, especially those that are immunocompromised. The main manifestation is pyogranulomatous pneumonia; nevertheless, extrapulmonary lesions have not only been reported, but are not uncommon, including arthritis and osteomyelitis. Despite the widespread occurrence of rhodococcosis, the macro- and microscopic lesions in the musculoskeletal system are still poorly understood, and a detailed study is needed to better understand the pathogenic potential of the organism. The aim of this report is to present the anatom...
Recombinant EHV-1 Vector Expressing Immunodominant Hemagglutinin Protein of Equine Influenza Virus H3N8 (Sub-Lineage Florida Clade 2). Equine herpesvirus type 1 (EHV-1) and equine influenza virus (EIV) are major respiratory pathogens in horses, causing significant economic losses in domesticated horses. Bacterial Artificial Chromosome (BAC) technology can be used to precisely manipulate the EHV-1 genome for the development of live-attenuated vector vaccines. Earlier, our group developed a live-attenuated EHV-1 vaccine by deleting virulence-associated genes using this technology and the mutant EHV-1 has been exploited for expressing foreign gene in the current study. Specifically, in this study, a mutant EHV-1 virus expressing...
Phenotypic and genetic factors that affect the likelihood of Standardbred foals achieving a race start. This study was conducted to quantify the probability of a Standardbred foal attaining early career milestones and to estimate some environmental and genetic factors that influence achievement of those milestones. Data for all Standardbred foals registered at birth in New Zealand from 1995 to 2018 were used to estimate variance components and fixed effects influencing attainment of three early-career traits; registered with trainer (REG), starting in a trial (TRIAL) and starting in a race (RACE). The study population comprised 65,256 foals. Of these, 65.5% attained REG, 55.4% progressed to TRIA...
Clinical and pathologic findings of splenic tumours in four horses: a case series. Splenic tumours are rare in horses, with limited published literature consisting primarily of individual case reports and one hepato-splenic lymphoma case series. This case series analyses the clinical presentation, diagnostic findings and clinical outcomes of four cases of splenic neoplasia that presented to a university referral hospital over a three year period (2022-2025). Methods: Presented are two cases of primary splenic lymphoma, and two cases of metastatic melanoma. Three cases (75%) presented with chronic, non-specific clinical signs including weight loss, colic and ventral oedema. O...
Morphological investigation of myocardial sleeves with potential relevance to atrial fibrillation in Norwegian-Swedish Coldblooded Trotters. Myocardial sleeves (MSs) are thin layers of cardiac muscle that extend from the atria into the caval and pulmonary veins. They are recognised as important structures in both initiating and maintaining atrial tachycardia, and especially atrial fibrillation (AF), which is the most clinically important cardiac arrhythmia in horses with a reported prevalence of 1.3-2% in Standardbred racehorses. In contrast, the Norwegian-Swedish Coldblooded Trotter (NSCT) has a much lower prevalence of AF despite experiencing similar physical demands. The purpose of this study was to describe the macro-, and micr...
The Effects of Cysteamine Zinc Supplementation on Blood Hormones, Intestinal Flora, and Metabolites in Lactating Mares. This study aimed to investigate the effects of cysteamine zinc (CS-Zn) supplementation on blood biochemical indices, blood hormones, fecal fermentation, fecal microbial diversity, and blood metabolites in lactating mares. Blood samples were collected via jugular venipuncture, and fecal samples were collected via rectal sampling before morning tethering on days 30, 60, and 90 of the trial. Fecal samples were analyzed for volatile fatty acids (VFAs) and microbial diversity, while changes in blood biochemical indices, blood hormones, and blood non-targeted metabolomics were also analyzed. The res...
In-Hand Training of Piaffe and Passage with Leg Stimulation: A Literature-Based Biomechanical Argument for Why This Method Fails to Produce True Collection. In-hand training of piaffe and passage via tactile leg stimulation (Handarbeit mit Touchieren) is widely practised in dressage, yet consistently produces horses that elevate their legs without achieving collection - a pattern termed Schenkelgänger (leg-movers) in classical German equitation. Based on published kinetic, kinematic, and electromyographic literature, this review argues that tactile leg stimulation activates the spinal nociceptive withdrawal reflex, an unloading movement mechanistically opposed to the elastic tendon rebound and ventral muscular chain activation that define true co...
The Peridental Structures of Equine Cheek Teeth: An Age-Dependent Anatomical Study of Maxilla and Mandible. Sequestration is the most common complication following equine cheek tooth extraction, occurring predominantly in the mandible of younger horses. Extraction-related trauma to the peridental region may impair healing. Despite its clinical relevance, detailed knowledge of peridental anatomy remains limited. This study investigated age-related differences in the peridental region of maxillary and mandibular equine cheek teeth 07 to 09. The peridental region of 24 cheek teeth rows from six cadaver heads was sectioned horizontally at approximately 10 mm intervals. Sections were photographed and the...
Single-stage orthognathic correction of campylorrhinus lateralis in foals using transection and fixation: Surgical description and outcome of four horses. Campylorrhinus lateralis ('wry nose') is a rare congenital maxillofacial deformity of foals resulting in compromise of the airway and severe class 4 malocclusion. Various surgical techniques to correct the deformity have been described, but contemporary data on single-stage transection and fixation, including use of a rib graft, and long-term functional and cosmetic outcomes remain underreported. Objective: To describe the transection-and-fixation technique and perioperative management used to correct wry nose in horses, and to report postoperative complications and long-term outcomes of horse...
Limited Effects of High-Intensity Laser Therapy on Clinical and Radiographic Outcomes in Three-Year-Old Arabian Racehorses with Dorsal Metacarpal Disease. Dorsal metacarpal disease (DMD) is a common musculoskeletal injury in young racehorses, and effective non-invasive treatments remain of clinical interest. This study aimed to evaluate whether high-intensity laser therapy (HILT), which was applied as the sole intervention in horses retired from training, reduces the clinical signs of DMD compared with untreated controls. During the 2023-2024 racing seasons, 15 Arabian racehorses diagnosed with DMD were enrolled; 9 received HILT and 6 served as controls without laser therapy. The treatment protocol consisted of five daily HILT sessions followed ...
Demographic change and selection patterns in thoroughbred racing horses over the 20th century. The Thoroughbred horse is a legacy of centuries of selective breeding for speed, emerging from the admixture of British mares and imported Oriental stallions. While previous work explored its genetic diversity, inbreeding, and selection signatures, the breed demographic and selection dynamics during the 20-century remain poorly understood. Here, we sequenced the genome of Phar Lap, a late-1920s/early-1930s racing champion, and analyzed the largest time-series of Thoroughbred whole-genome sequences, within a global panel of 850 horse genomes. Demographic modeling reveals a marked decline in gen...
Prevalence of equine lungworm (Dictyocaulus arnfieldi) infection and associated risk factors in Egypt. infection is a common parasitic respiratory disease of equines that can adversely affect animal health, welfare, and productivity. However, epidemiological information on this infection remains limited in many regions of Egypt. This study aimed to determine the prevalence of and identify associated risk factors among equines in three Egyptian governorates. Unassigned: A cross-sectional study was conducted on 415 equines, including 150 donkeys, 55 mules, and 210 horses. Animals were examined for , and data on species, age, body condition, and deworming history were collected. Associations bet...
Global distribution of cattle, horses, goats, sheep and buffaloes at 1 km resolution for 2000-2022 based on subnational census data and spatiotemporal machine learning. The article describes the production and evaluation of annual livestock densities and headcounts of cattle, horses, sheep, goats and buffaloes (including 95% probability prediction intervals) at 1 km spatial resolution for the 2000-2022 period using spatiotemporal machine learning. A compilation of subnational livestock census data has been imported, harmonized and used as reference data (55,336 census polygons and 939,257 individual data entries; covering 147 countries) to build predictive models. A large stack of multi-source harmonized raster data sets (128 individual layers) were used as f...
Preliminary Metabolomic Analysis: Serum Metabolomic Dynamics During Estrus Synchronization in Kazakh Mares. This study aimed to analyze the differences in serum metabolomes at different stages of estrus synchronization in Kazakh horses, to characterize dynamic changes in serum metabolites during estrus synchronization, and to screen potential metabolic markers and key regulatory pathways. Four sampling stages (M1: intravaginal device insertion; M3: device removal, labeled consistently with the pre-experiment timeline; P: 24 h post-PG injection; L: tertiary follicle emergence) were selected. The research results showed that 37 significantly different metabolites (DAMs) were identified in the M1-vs.-M...
Differential shaping of equine gut microbiota structure and function by breed and feeding regimen. The gut microbiota plays an essential role in host energy metabolism and immune function. Horses are non-ruminant herbivores that rely heavily on hindgut microbial fermentation to meet their energy requirements. However, the relative contributions of host genetic background (breed) and environmental factors (feeding regimen and geographical location) to shaping the equine gut microbiota remain poorly understood. Unassigned: In this study, 16S rRNA gene sequencing and functional prediction analysis were performed on 139 equine fecal samples to systematically investigate the differential effects...
Electrochemotherapy Following Surgical Cytoreduction for the Treatment of Recurrent Equine Sarcoids: A Retrospective Study of 23 Lesions. Despite the wide range of therapeutic options currently available for equine sarcoids, recurrence of these lesions remains a major clinical challenge. Consequently, the identification of effective strategies for the management of recurrent sarcoids remains an important objective in equine oncology. The aim of this retrospective study was to evaluate the clinical outcome of surgical cytoreduction combined with intraoperative electrochemotherapy in horses affected by recurrent equine sarcoids. Medical records of horses treated between July 2018 and August 2025 at the Veterinary Teaching Hospital...
Altered gene expression in the liver and small intestine of horses with equine neuroaxonal dystrophy. Equine neuroaxonal dystrophy/degenerative myeloencephalopathy (eNAD/EDM) is the second most common diagnosis of spinal ataxia in horses in the United States. The disease develops due to a combination of vitamin E deficiency and an unknown genetic risk factor(s), and there currently is no effective treatment. Objective: We performed transcriptomic profiling of the liver and small intestine of horses with and without eNAD/EDM, as both tissues are the main locations for absorption, metabolism, and delivery of vitamin E to the nervous system. Methods: Case-control exploratory study. Methods: Post...
Mares with severe equine asthma exhibit a narrower trachea than geldings in a retrospective radiographic study of 189 horses. To evaluate potential relationships between sex, asthma severity, and tracheal diameter in adult horses through the use of thoracic radiography. Unassigned: This was a retrospective case-control study of horses that underwent thoracic radiography at the Université de Montréal from 2018 through 2024. Horses were classified as control, mild/moderate asthma, or severe asthma (SEA) according to the latest consensus statement on equine asthma. To account for radiographic magnification and body size, standardized ratios of tracheal diameter relative to the fifth thoracic vertebral body length and ...
Preliminary Assessment on Pathogenicity of an African Horse Sickness Virus Serotype 1 Strain in Guinea Pigs and Horses. African horse sickness (AHS), a noncontagious insect-borne disease affecting equids, is caused by the African horse sickness virus (AHSV) and is associated with extremely high morbidity and mortality. AHSV has nine distinct serotypes (AHSV-1 to AHSV-9). In a previous study, we characterized the genome and in vitro growth properties of AHSV/C, a cell-adapted derivative of an AHSV-1 strain imported into China 60 years ago, and verified its safety in mice. This study preliminarily explored the pathogenicity of AHSV/C in guinea pigs and horses (its natural host). Six groups of guinea pigs were ino...
Anatomical Insights Into the Equine Cervical Intervertebral Foramina: Implications for Veterinary Practice. The equine cervical intervertebral foramina (IVF) represent vital anatomical regions facilitating the passage of spinal nerves and associated vasculature. An in-depth understanding of their anatomy is imperative for the safe implementation of diagnostic and surgical interventions. Despite their clinical significance, anatomical descriptions of the equine cervical IVF remain under-characterised in the existing literature, particularly in relation to the needs of equine veterinary surgeons. Our study provides comprehensive anatomical analysis of the IVF at the cervical vertebral levels C5/C6 and...
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