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Quantitative evaluation of behavioral and physiological adaptation during retraining of retired Thoroughbred racehorses. Retired Thoroughbred racehorses commonly transition into riding roles, yet outward behavioral calmness may not fully reflect internal physiological regulation, with implications for safety. Objective: To quantify behavioral and autonomic adaptation across repeated startle exposures and assess concordance between behavioral and physiological indicators. Methods: Twelve retired Thoroughbreds underwent standardized plastic-bag startle trials conducted across three sessions (T1-T3), each including pre-training (Before) and post-training (After) phases, with three repeated exposures at 5-minute int...
Global prevalence and epidemiological determinants of African horse sickness: A systematic review and meta-analysis. African horse sickness (AHS) is a highly fatal, vector-borne viral disease of equids with substantial economic and animal health impacts, particularly in endemic regions. Despite numerous epidemiological studies, reported prevalence estimates remain highly variable, and a comprehensive quantitative synthesis is lacking. This study aimed to systematically evaluate and synthesize the global prevalence of AHS and to identify sources of epidemiological heterogeneity. A systematic review and meta-analysis were conducted following PRISMA 2020 guidelines, with the protocol registered in the Open Scie...
Physical Therapy Intervention With Hippotherapy (HPOT) Affects Balance Control in the Elderly: A Randomized Controlled Trial. Aging is characterized by a decline in functional abilities, strength, balance, flexibility, agility, and coordination due to neurological and muscular changes. Hippotherapy (HPOT) has been recognized for its physical and psychological benefits for older adults. Hence, this study aimed to investigate the effects of hippotherapy on balance in elderly individuals. The novelty lies in using the Biodex Balance System SD for dynamic balance assessment in healthy elderly without neurological disorders. Unassigned: We recruited elderly men aged 60 to 70 who had independent mobility and medical cleara...
Feasibility study of microbubble enhanced echocardiography in normal horses. Intrapulmonary shunting, a contributor to hypoxemia in both anesthetized and spontaneously breathing horses, may occur in association with pulmonary disease, general inhalation anesthesia, or systemic inflammation. In human medicine, transthoracic microbubble-enhanced echocardiography is a widely used method to detect intrapulmonary right-to-left shunting, especially in hepatopulmonary syndrome. This study aimed to adapt and evaluate the feasibility of this technique in horses, laying the groundwork for future clinical applications. Twelve healthy horses underwent two treatments: (1) infusion ...
The effect of form on equine salt intake. Sodium and chloride are required nutrients and are typically met using sodium chloride (salt) via compressed blocks. The objective of this study was to compare salt intake using block or loose salt. Sixteen mature horses were blocked by housing style and assigned to block salt or loose salt (form) for four 7-day periods. Salt intake was measured by weight at the end of each period and was not affected by form (P = 0.070) or period (P = 0.902). There was an effect of horse (P < 0.001). Horses consumed between 2 and 135 g of salt daily, however; over half of the horses in the study di...
Severe Macular Commotio Retinae Following a Fall from a Horse in a Pediatric Patient. Background and Clinical Significance: Blunt ocular trauma is a significant but often underestimated cause of visual impairment, particularly among adolescents involved in high-risk activities such as horseback riding. While most equestrian injuries affect the head and extremities, ocular trauma, especially commotio retinae, can result in severe visual complications. Case Presentation: We report the case of a 15-year-old girl who sustained blunt ocular trauma to the left eye following a fall from a horse and presented with decreased visual acuity. Multimodal imaging revealed outer retinal abnor...
Comparison of in vitro degradation of immunoreactive adrenocorticotropic hormone and insulin in equine blood measured by two immunoassay methods. This study compared the in vitro stability of equine plasma adrenocorticotrophic hormone (ACTH) and serum insulin measured by chemiluminescent assay (CLA; Siemens Immulite 2000XPi) and immunofluorescent assay (IFA; Tosoh AIA-900) after storage at 4°C or room temperature (approximately 21°C) for clinically relevant periods. Fresh equine EDTA blood for ACTH and coagulated blood for insulin were aliquoted and analysed immediately (T0) and after storage. ACTH was assessed at 24, 48 and 72 hours; insulin was assessed at 24 hours, 72 hours and 7 days. Percentage recovery relative to T0 was analyse...
Unusual, fatal neck cancer in a foal: immunohistological investigations and differential diagnosis. Neck masses may represent a diagnostic challenge for equine veterinarians, since they may involve different structures with a similar clinical appearance. Whereas neck masses in foals mostly result from non-neoplastic conditions, including various congenital abnormalities, neoplastic cervical masses have been rarely documented. This report describes the unusual case of a rapidly growing neck cancer in a four-month-old colt, resulting in a fatal outcome. Gross and immunohistological findings were most consistent with a poorly differentiated thymic carcinoma with sarcomatoid features and multifo...
Retrospective assessment of equine herpesvirus type 1 (EHV-1) genotype-associated clinical disease in Ontario. Equine herpesvirus type 1 (EHV-1) is an important viral pathogen in horses, associated with diverse clinical manifestations including fever, upper and lower respiratory disease, neurological signs, ocular disease, and abortion. Currently, EHV-1 variants (genotypes) are classified based on a single nucleotide polymorphism mutation of the open reading frame 30 (ORF30). Unassigned: The aim of this retrospective study was to evaluate the EHV-1 genotypes present in horses with various clinical presentations, including respiratory disease, abortion, and neurological disease, at a referral center in ...
Influence of Housing and Fecal Egg Count on Cytokine Profiles (IL-4 and IL-13) in Equines. Strongyles are parasitic roundworms that cause significant gastrointestinal infections in equines, primarily through contact with infected soil. Worldwide, strongylosis affects nearly 90% of horse populations. Objective: The objectives of our study were to determine if there was a relationship between fecal egg count (FEC) and housing types on interleukin IL-4 and IL-13. Methods: Horses (N=25) were separated into two groups based on housing conditions: pasture (housed on pasture 24/7; PS, N=13) and semi-intensive (housed in stalls with turnout overnight; SI, N=12). Within each housing group, t...
Pharmacokinetics of Ertugliflozin, a Sodium-Glucose Co-Transporter-2 Inhibitor (SGLT2i) in Horses After Enteral Administration. Ertugliflozin is a sodium-glucose co-transporter-2 inhibitor that has demonstrated promise as a treatment for hyperinsulinaemia in horses. Despite the frequent use of ertugliflozin in equine clinical practice, the pharmacokinetics of this drug in horses has not been established. The aim of the present study was to determine the pharmacokinetics of one supratherapeutic dose (0.25 mg/kg) of ertugliflozin in eight horses. Horses were defined as being healthy by physical examination, haematological, blood biochemical and oral sugar test (OST) results. Plasma concentrations of ertugliflozin were qu...
Historical perspectives guide advances in equine minimally invasive soft tissue surgery. Equine minimally invasive soft tissue surgical techniques have increased in demand and frequency with concurrent expansion of training programs under the oversight of the American College of Veterinary Surgeons. Benefits of recent advances in laparoscopic techniques include reduced cost and risk associated with general anesthesia and anesthetic recovery, improved visualization of the surgical field relative to open procedures, and more rapid return to performance, further improving patient welfare and limiting economic loss to the industry following surgical interventions. The evolution of lap...
Accuracy of large language model-based artificial intelligence tools for equine topics. Artificial intelligence (AI) platforms are becoming increasingly popular as resources for equine information. However, these platforms generate responses from a wide range of sources and do not always distinguish between fact and opinion. Objective: The objective of this study was to assess the accuracy and quality of AI-generated answers to equine-related questions. Researchers hypothesized that AI platforms could answer basic equine questions effectively but would perform poorly on complex topics or questions. Methods: Forty questions were written covering general horse care, facilities mana...
Beyond cortisol: evaluating serotonin, brain-derived neurotrophic factor, and oxytocin as indicators of equine welfare across three training regimens. BACKGROUND: Quantifying the balance between workload, stress, and recovery across equine disciplines remains challenging, and no single circulating biomarker provides a definitive index of welfare-related stress load. Cortisol, oxytocin, serotonin (5-hydroxytryptamine, 5-HT), and brain-derived neurotrophic factor (BDNF) may provide complementary information on endocrine and neuromodulatory responses. METHODS: Paired serum samples were collected from show jumping horses (n = 17) before and after competition, racehorses (n = 43 enrolled, n = 41 analyzed) before and after sessions at ...
Treatment of ventricular arrhythmias with oral sotalol in four horses. Sustained ventricular arrhythmias (VAs) in horses can require medical intervention. Prompt pharmacological treatment is indicated when the arrhythmia leads to hemodynamic or electrical instability. Established antiarrhythmic treatment of VA in horses includes lidocaine and magnesium, administered parenterally. Other antiarrhythmic agents are used; however, concerns regarding adverse effects, financial restrictions, logistics of administration, and lack of access often limit their use. While anecdotal reports of oral administration of sotalol for treatment of VA in horses exist, sotalol has pri...
In vitro cultivation of Trypanosoma equiperdum: Comparison of in vitro and in vivo antigens for an ethical and sustainable serological diagnosis of Dourine. The protozoan Trypanosoma equiperdum is the causative agent of Dourine, a contagious sexually transmitted disease of equines that can manifest itself in chronic or acute form. Dourine has serious veterinary and economic implications, as there are no vaccines available for prevention and the management of the disease requires the culling of infected animals, together with rigorous sanitary control measures. This study compares the traditional production of T. equiperdum antigen grown in vivo, with an in vitro cultivation methodology developed to eliminate the use of animals. The in vitro and in...
Prepubic Tendon Rupture and Uterine Herniation in a Late-Term Kurdish Mare: A Case Report. Prepubic tendon rupture (PPTR) is a rare but life-threatening complication in late-term pregnant mares. It results in abdominal wall failure, ventral oedema and a poor prognosis for both the mare and foetus. A 14-year-old multiparous Kurdish mare at approximately 310 days of gestation presented with acute ventral distension, reluctance to walk and cranial displacement of the udder. Clinical evaluation revealed tachycardia, pallor and Grade 3/4 ventral oedema. Haematology indicated leucocytosis and haemoconcentration. Transabdominal ultrasonography showed a viable foetus and severe thinning of ...
A service provider perspective in Irish horseracing on the availability of retirement specific support services for professional jockeys and perceived barriers and facilitators to their use. Retirement can come at any time in horse racing due to the unpredictable nature of the sport. Preplanning for the retirement transition in sport has been reported to lead to faster adjustment to retirement and better transition for athletes. The purpose of this study was to highlight the current support services available to Irish horseracing jockeys to aid with career transitions and to a) explore perceived barriers and b) perceived facilitators to their use. Semi-structured interviews were conducted with 11 representatives from various racing bodies including the Irish Horse Racing Regulator...
The Effects of L-Citrulline on the Apparent Digestion and Metabolism of Nutrients, Blood Hormone Levels, Amino Acid Metabolism and the Diversity of Faecal Microbiota in Mares in the Later Stage of Pregnancy. This study aimed to investigate the impact of dietary L-citrulline supplementation on the health of mares during late gestation. Thirty-two healthy mares in late pregnancy were randomly assigned to four groups: a control group (CON, 0 g/d) and three treatment groups receiving 15, 30, and 45 g/d/head of L-citrulline, respectively. The trial spanned 72 days, including a 12-day adaptation phase and a 60-day formal feeding period. A fixed daily feeding amount of 11.2 kg/head was provided, ensuring complete consumption and consistent dry matter intake across all groups. Results demonstrated that su...
miRNA Sequencing and Differential Analysis of Testis in 1-Year-Old and 2-Year-Old Kazakh Horses. The represents a significant genetic resource within China's population, characterized by notable resilience and an ability to thrive on coarse forage. Nevertheless, a decline in its numbers has been observed recently, making the improvement of its reproductive performance crucial for the preservation of this breed and the advancement of the related industry. In this study, testicular tissues from 1-year-old (pre-pubertal) and 2-year-old (post-pubertal) were analyzed. miRNA sequencing was conducted on tissues from these age groups, followed by bioinformatics analyses to elucidate the functi...
The immediate effect of whole-body vibration therapy on mechanical nociceptive thresholds in horses with thoracolumbar pain. Treating primary back pain in horses can be challenging and often necessitates a multimodal approach. Whole-body vibration therapy (WBV) has been used in both horses and humans to alleviate pain and strengthen muscles. A recent study showed worsening back pain following a 30-minute session of WBV; however, the immediate effects of WBV were not evaluated. The purpose of this study was to assess the immediate effects of whole-body vibration therapy on horses with back pain after a single session of WBV. Objective: The objective of the current study was to determine the immediate effects on mecha...
Nano-Encapsulated Vitamin E Enhances Cryo-Resistance of Stallion Spermatozoa: A Comprehensive Evaluation of Sperm Quality, Kinematic Parameters, Antioxidant Capacity, Microbiota and Ultrastructure. This experiment explores the comparative ability of vitamin E (VE) and its nano-emulsion (VEN) in enhancing cryo-resistance of stallion spermatozoa by examining semen quality, kinematic variables, acrosome integrity, apoptosis, antioxidant capacity, ultra-structural alterations and microbiota of cryopreserved stallion sperm. Semen from five stallions (8-10 years) was cryopreserved with 0.1 or 1 mM of VE or VEN; and a non-additive group served as the control. The VEN particles ranged in size from 72 to 172 nm, with a mean diameter of 287 nm. Supplementation with VE (1 mM) or VEN (0.1 ...
Molecular and serological survey on Theileria equi and Babesia caballi infecting Arabian horses in the northern provinces of Syria. Equine babesiosis is one of the prevalent diseases in horses worldwide, but its presence in Syria generally and in the northern region specifically is not known. In Syria, the civil war has severely disrupted veterinary services, hence disease control measures, creating a fertile ground for the spread of tick-borne diseases. Unassigned: This study aimed to conduct a comprehensive molecular and serological survey of and . in Arabian horses from the northern provinces of Syria, regions heavily impacted by the war. Unassigned: A total of 110 Arabian horses, aged between 2 and 10 years, were inc...
Heart rate variability in horses with naturally occurring gastric ulcers: Response to omeprazole and sucralfate treatment. Equine gastric ulcer syndrome (EGUS) is the most common disease affecting the equine stomach. Heart rate variability (HRV) describes and quantifies the variability between consecutive heartbeats due to the neurohormonal regulation of the heart. It has been considered a non-invasive method to detect autonomic tone changes that can be influenced by pain and disease. Unassigned: This study aimed to assess the HRV indices in horses affected by EGUS submitted or not to treatment. Unassigned: A cohort of 45 mares underwent baseline gastroscopy (T0); 24/45 mares diagnosed with Equine Squamous Gastric...
Horse racing towards antibiotic resistance. Accompanying animals as a source of antibiotic-resistant bacteria. Antibiotic resistance is a significant issue in modern infectious medicine and veterinary science, with animals, including horses, playing a crucial role in its dissemination. Antibiotics, used both for treatment and prevention of diseases in animals, influence the composition of the microbiota and promote the selection of resistant strains that can be transmitted to humans through direct or environmental contact. Horses, currently classified as companion animals, serve as a reservoir of commensal and pathogenic bacteria, including multidrug-resistant strains capable of horizontal gene transfe...
Circulating microRNA profiles as diagnostic and prognostic biomarkers for acute and carrier Theileria equi infection. Equine piroplasmosis caused by Theileria equi exhibits a wide clinical spectrum ranging from acute disease to lifelong asymptomatic carriage, posing significant diagnostic and epidemiological challenges. In this cross-sectional case-control study, equines were classified as acutely infected, asymptomatic carriers, or uninfected controls based on clinical examination and quantitative PCR. Hematological and biochemical alterations were assessed, and plasma miRNA profiles were characterized using small RNA sequencing, followed by qRT-PCR validation of selected miRNAs. Cytokine gene expression in ...
CD8+ T-cells, CD86+ macrophages and TNF-α signalling pathways are correlated with fetlock osteoarthritis in racehorses. There is emerging evidence for the role of the immune system in osteoarthritis (OA) pathophysiology; however, little is known about how immune cells and the synovial transcriptome are altered in naturally occurring equine OA. Objective: To evaluate synovial fluid (SF) and synovial membrane (SM) immune cell populations and the SM transcriptome in racehorses with fetlock OA. Methods: Cross-sectional cadaver study. Methods: Fetlock joints from racehorses euthanised at NY racetracks were considered for inclusion. SF and SM were analysed by flow cytometry using T-cell (CD3, CD4, CD8) and macrophage...
Rostral hard palate swelling (lampas) in horses: true or fiction? This study aimed to determine the occurrence of swellings (lampas) in the rostral portion of the hard palate in young, adult, and elderly horses and to characterize them histologically. One hundred and twenty horses of different ages were evaluated by oral inspection. Horses were classified with lampas when the mucosa of the hard palate extended beyond the occlusal surface of the upper incisors and samples of palatal mucosa were collected. Ten other horses without rostral hard palate alterations, euthanized for unrelated causes, were included as the control group. Histological analysis include...
Allogeneic Platelet-Rich Gel Supernatant Reprograms the Cytokine and Growth Factor Microenvironment in an Equine In Vitro Inflammatory Tendon System. Tendinopathy involves a dysregulated inflammatory microenvironment in which cytokines, growth factors (GF) and extracellular matrix components interact dynamically. Platelet-rich plasma (PRP) is widely used as a regenerative therapy, but its mechanisms of action in inflamed tendon remain unclear. This study evaluated whether platelet-rich gel supernatant (PRGS) reprograms the inflammatory-anabolic mediator network in an equine in vitro tendon explant system stimulated with lipopolysaccharide (LPS). Tendon explants were cultured under six experimental conditions, including non-stimulated contro...
Measuring Chuckwagon Racehorse Movement Asymmetry Before and After Racing Using Wearable GNSS-IMUs: A Preliminary Study. In Chuckwagon racing, teams of four Thoroughbred horses pull wagons at high speeds. Movement symmetry is a key locomotion metric linked to force production, racing direction, and lameness. Racehorse symmetry in trot during on-track warmups and cooldowns was assessed. Over 10 days, 60 horses (average 8 per day) were fitted with Global Navigation Satellite Systems combined with Inertial Measurement Unit (GNSS-IMU) sensors. Weight-bearing asymmetry was quantified using the minimum difference (MnD) in vertical trunk displacement between diagonal limb pairs, and push-off asymmetry was quantified us...
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