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Nanoplastics internalization impairs mitochondrial activity in equine sperm. Nanoplastics (NP) accumulation in biological tissues and their adverse effects on fertility through inflammatory and oxidative stress responses have recently been described as consequences of global plastic pollution. However, little is known about the impact of NP on gametes. This study aimed to assess the internalization of NP and their effects on mature equine spermatozoa. Frozen-thawed ejaculates from five stallions were divided into untreated control (CTR) and samples supplemented with different concentrations (10, 50, 100 and 200 μg/mL) of 30 nm polystyrene NP. At baseline (T0), and a...
Pharmacokinetic analysis of bumped-kinase inhibitors in horses demonstrates their potential utility for prevention and treatment of equine protozoal myeloencephalitis. To determine the systemic and CNS distribution of bumped-kinase inhibitors (BKIs) in healthy horses, assess potential side effects, and identify a candidate compound for a clinical trial in equine protozoal myeloencephalitis (EPM) cases. Unassigned: 9 pharmacokinetic (PK) experiments were conducted from March 2021 through November 2024. Bumped-kinase inhibitors 1708, 1748, and 1841 were screened in Sarcocystis neurona growth assays and IV PKs, followed by investigation of a lead BKI compound by single-dose or multiday oral administration. Serial plasma collections were performed to assess syst...
Orthopaedic Injuries in 272 Dressage Horses: A Retrospective Study. There is limited information regarding orthopaedic injuries in dressage horses. This study assessed the prevalence of injuries in a mixed referral and first opinion population of 272 horses training and competing in dressage, 238 of which were followed up one to five years after injury. Warmblood (55.8%) and Iberian (38.6%) breeds predominated. The median age was 8 years (interquartile range [IQR] 5,11; range 1,21). Horses were examined due to lameness (85.3%) or poor performance (14.7%). The median lameness grade was 2/5 (IQR 2,4; range 0,4). Forelimb lameness was more prevalent than hindlimb...
Endothelial glycocalyx damage is associated with small intestinal disease in horses. To determine if blood and peritoneal fluid levels of syndecan-1, heparan sulfate, and hyaluronan are elevated in horses with small intestinal disease compared to healthy counterparts. Unassigned: 61 horses were categorized into control (n = 20), inflammatory (11), and strangulating (30) groups. Paired peritoneal fluid and blood samples were obtained from each group from December 2016 through December 2024 and analyzed via equine-validated ELISAs for syndecan-1, heparan sulfate, and hyaluronan concentrations. Patient survival to discharge was recorded for all groups. Immunofluorescence staining...
Surgical repair of bilateral lateral patellar luxation in a foal using block-recession trochleoplasty and polypropylene mesh reinforcement: Case report and review of literature. Patellar luxation is a rare orthopedic condition in horses, with congenital lateral patellar luxation being the most frequently reported form. A few sporadic reports have described surgical options for addressing equine patellar luxation. This report details the clinical presentation of a 2-month-old Italian Trotter foal diagnosed with bilateral lateral patellar luxation. Staged surgical correction of both stifles was performed, including block recession trochleoplasty combined with the application of polypropylene mesh for reinforcing medial imbrication sutures. Intra- and post-operative eval...
Evaluation of a targeted enrichment panel for gene editing detection and assessment of population variation in Thoroughbred horses. Gene editing and genome manipulation offer great promise for treating diseases in both humans and animals. There is a danger, however, that this technology could be used for other purposes such as performance enhancement. To detect such 'gene doping' events, we evaluated a targeted enrichment panel and next-generation sequencing to assess its reproducibility, sensitivity, and capability of variant detection on a wide variety of samples and biological matrices. The panel was verified against existing data for the myostatin gene, a PCR-based SNP panel, and whole genome sequencing in a subset of ...
The metabolomic profile of a high starch versus no starch diet in athletic horses. Feeding a high amount of starch-rich grains is common practice for performance horses even though the horse has evolved to eat a grass based, i.e. low starch diet. To our knowledge, there are no studies using metabolomics to investigate the effects of a high-starch diet in horses. In this study we investigated differences in the plasma metabolic profile of 6 Standardbred horses fed a no-starch, forage-only (F) diet or a high-starch forage-concentrate (FC) diet for 29 days, respectively in a cross-over design. Postprandial plasma samples were collected on the morning of day 25 of each dietary ...
[The importance of selenium for neonatal foals and calves – a literature review]. This article provides an overview of the clinically relevant functions and metabolic processes of selenium. Especially equine and bovine neonates are affected by selenium deficiency leading to serious consequences. Severe selenium deficiency may especially result in skeletal and/or heart muscles damage, which can result in serious illness and death of the animal. The typical clinical picture is known under various names and is often referred to as rhabdomyolysis, or more precisely as nutritional muscular dystrophy (NMD) and in the past usually as white muscle disease. Early recognition of nutr...
A Multi-Site Observational Evaluation of the Equine Assisted Growth and Learning Association Model of Equine-Assisted Psychotherapy for Veteran Trauma Survivors. The primary aim of this study was to evaluate the feasibility, safety, and preliminary outcomes of the Equine Assisted Growth and Learning Association (Eagala) model of equine-assisted psychotherapy for active-duty military and veteran trauma survivors. This was a retrospective multi-site observational study. Study participants completed four psychological instruments pre- and post-intervention. These were the PTSD Checklist for DSM-5, the Patient Health Questionnaire, the Satisfaction with Life Scale and the Sheehan Disability Scale. The Client Satisfaction Questionnaire-8 was also completed ...
Glycan Signatures on Neutrophils in an Equine Model for Autoimmune Uveitis. Glycosylation of surface proteins is a crucial post-translational modification that reflects the activation status of neutrophils, the predominant leukocyte subset in humans and horses. Neutrophils have emerged as active contributors to diseases mediated by the adaptive immune system, such as equine recurrent uveitis (ERU), a sight-threatening disease in horses and a unique model for studying the pathogenesis of autoimmune uveitis in humans. Since changes in surface glycosylation can impact neutrophil function, we were interested in the surface glycosylation landscape on neutrophils from healt...
Classification of donkey systems in Ethiopia. Working donkeys play a critical role in transportation, agriculture and household resilience in low- and middle-income countries. Other animals that are kept for production purposes, such as cattle, are often grouped into broad production system classes, such as dairy or pastoral, for comparison between and better understanding of the needs and outputs of animals within specific sectors. Despite the importance of working donkeys for sustaining livelihoods there are no systematic classifications of these populations. The aim of this study was to classify and characterise donkey systems in Ethio...
Equine endometrial organoids preserve tissue structure and cycle-stage transcriptional identity†. The endometrium is a hormonally responsive tissue that undergoes cyclic remodeling. Although endometrial organoids have been established in several species, detailed characterization remains limited. Here, we assessed the structural and molecular fidelity of equine endometrial organoids across reproductive cycle stages and during extended culture. Organoids were generated from biopsies collected during estrus and diestrus and analyzed using histology, immunohistochemistry, electron microscopy, and bulk- and single-cell RNA sequencing. Organoids formed polarized cystic structures composed of co...
Methodologies to Identify Metabolic Pathway Differences Between Emaciated and Moderately Conditioned Horses: A Review of Multiple Gene Expression Techniques. Starvation in horses presents critical welfare, economic, and management challenges with underlying molecular mechanisms of metabolic modification and recovery left poorly defined. Prolonged caloric deprivation induces significant systemic shifts in carbohydrate, protein, and lipid metabolism, reflected in coordinated changes in tissue-specific gene expression. This review synthesizes current knowledge on equine metabolic responses to starvation, emphasizing pathways found through RNA sequencing (RNA-seq) and real-time quantitative polymerase chain reaction (RT-qPCR) studies. Molecular investi...
Metagenomic Applications to Herbivore Gut Microbiomes: A Comprehensive Review of Microbial Diversity and Host Interactions. Herbivorous animals rely on complex gastrointestinal systems and microbial communities to efficiently digest plant-based diets, extract nutrients, and maintain health. Recent advances in metagenomic technologies have enabled high-resolution, culture-independent analysis of gut microbiota composition, functional potential, and host-microbe interactions, providing insights into microbial diversity across the herbivore digestive tract. This review summarizes key findings on the gastrointestinal microbiota of herbivores, focusing on ruminant foregut and non-ruminant hindgut fermentation. Ruminants...
Dynamic Mobilization Exercises Improve Activity and Stride Parameters Measured with Accelerometry in Sedentary Horses. Dynamic mobilization exercises (DME) are an effective strategy to prevent musculoskeletal injuries and promote back health in sport horses. Previous studies focused mainly on multifidus muscle cross-sectional area, with limited data on locomotion and adaptation timing. This study evaluated locomotor changes using accelerometry, over 8 weeks of DME application in 14 sedentary horses: a DME group ( = 8) performing 10 different DME (3 neck flexions, 1 neck extension and 3 lateral bending exercises to each side), 5 repetitions of each DME per session, 3 sessions/week, and a control group ( = 6), t...
Molecular Detection and Genetic Characteristics of Equine Herpesviruses 1 and 4 in Egypt. The present study investigated the molecular detection and genetic characteristics of equine herpesvirus 1 (EHV-1) and EHV-4 circulating within Egyptian horse populations during 2019-2022. A total of 79 animals were sampled (54 nasal swabs and 25 aborted fetal tissues). PCR assays revealed that 24 (30.3%) and 7 (8.8%) samples were positive for EHV-1 and EHV-4, respectively. Additionally, 5 (6.3%) samples were concurrently infected with both viruses. Four EHV-1 and three EHV-4 isolates were genetically characterized based on partial sequencing of gB gene. The four EHV-1 strains displayed 100% n...
Effect of N-Butylscopolammonium Bromide and Metamizol Sodium on Heart Rate, Blood Pressure, and Echocardiographic Measurements in Warmblood Horses With Aortic and Mitral Valve Regurgitation. Administration of N-butylscopolammonium bromide (NBB) with metamizol sodium (NBBM) causes tachycardia and hypertension, and has been associated with accentuated cardiac murmurs. Objective: To evaluate the effect of a pharmacological challenge using NBBM on valvular regurgitation and cardiac murmurs in horses with aortic (AR) and mitral valve regurgitation (MR). Methods: Twenty Warmblood horses with AR and 20 with MR. Methods: Cardiac auscultation and two-dimensional (2D), M-mode, color flow, pulsed wave Doppler flow, and tissue Doppler echocardiography were performed with simultaneous ECG reco...
Mechanical characterization of the equine linea alba and finite element modeling of suture patterns effects on its closure. Postoperative incisional complications are common in horses following abdominal surgery, which typically involves an incision through the abdominal wall along the linea alba. The linea alba is a fibrous band running in the craniocaudal direction along the ventral abdomen. This incision is closed with sutures, where the choice of suture pattern and surgical technique has shown to influence the rate of complications. Therefore, this study investigated how different suture patterns and variations influence the stresses in the tissue by combining experimental and computational biomechanics. The me...
Wearable smart textile band for continuous equine health monitoring. Continuous physiological monitoring is well-established in human healthcare for early disease detection and management. However, translation of these technologies to large animals such as equines remains underdeveloped due to anatomical constraints, dense hair coat coverage, and requirements for unimpeded mobility. Equines, particularly racehorses, are prone to asthma and cardiovascular abnormalities, with nearly 80 % affected by mild to moderate asthma, impacting performance and long-term health. Despite the need for continuous monitoring, existing solutions require shaving hairs, often lack...
Laser fenestration of the dorsal pharyngeal recess does not correct experimentally induced dorsal nasopharyngeal collapse in horses. To quantify the impact of experimentally induced dorsal nasopharyngeal collapse (NPC) on respiratory performance parameters and assess the efficacy of laser fenestration of the dorsal pharyngeal recess as a treatment option for experimentally induced NPC. Methods: Experimental interventional study. Methods: Six adult Standardbreds (one with naturally occurring disease). Methods: After an 8 week conditioning program, baseline parameters (V̇Omax, pharyngeal pressure, peak airflows, upper airway resistance) and dynamic endoscopy videos were collected in a high-speed treadmill test (T1). Dorsal N...
Morphometric changes in overweight horses following 10-week weight loss programs. Up to 70% of horses in domestic equine populations are overweight. Promotion of weight loss is an important component of limiting the detrimental co-morbidities associated with excess adipose tissue. The use of a body condition score (BCS) can help equine caregivers track their horse's weight-status. However, this single score doesn't reflect changes in individual adipose depots. The purpose of this study was to characterize morphometric changes (including 8 anatomic BCS measurements that make up the whole-BCS) in horses during 3 different weight-loss programs over 10 weeks. Methods: Thirty-tw...
The Effect of Hippotherapy Simulator-Assisted Therapy on Motor and Functional Outcomes in Children with Cerebral Palsy. : Horse riding simulators (HRS) provide rhythmic, repetitive, and multidirectional movements analogous to horseback riding, which may facilitate postural control, balance, and functional abilities in children with cerebral palsy (CP). This study aimed to investigate the effects of the HRS application on the muscle tone of the lower extremity, gross motor function, trunk postural control, balance, gait functions, and functional independence in children with CP. : A quasi-experimental study included 30 children with cerebral palsy (17 hemiparetic, 13 diparetic; mean age, 9.3 ± 3.2 years). All p...
Cryptorchidism in Equid: A Retrospective Study on Diagnostic Approach, Anaesthesia Management, Surgical Treatment and Outcomes. Over the years, various diagnostic and surgical techniques have been developed to recognise and treat cryptorchidism in equid. This study retrospectively analysed cases of cryptorchidism referred to two centres between 2012 and 2025. Clinical data collected included species, breed, age, gender, location of retained testis, diagnostic approach, anaesthesia plan and surgical treatment, perioperative medical treatment, intra-operative complications and outcomes. A total of 37 clinical cases were included, 1/37 was a donkey and 1/37 was an intersex female. Most of the horses were three years old a...
Equine Metabolism of Voxelotor and Its Impact on Hematological Indices: A Doping Control Perspective. Voxelotor, a therapeutic drug for sickle cell disease, has been reported to elevate serum erythropoietin and hemoglobin levels in healthy individuals. Because of its potential to alter blood parameters, the World Anti-Doping Agency (WADA) classified voxelotor under category M1 of the 2023 Prohibited List. Despite this classification, little is known about its metabolic behavior in either humans or animals. In this study, the metabolism of voxelotor was investigated in Thoroughbred horses after oral administration. Using liquid chromatography high-resolution mass spectrometry (LC-HRMS), 35 meta...
Plasma and Urine Pharmacokinetics of Intravenous Pridinol in Thoroughbreds for Its Medication Control. We examined the pharmacokinetics of intravenous pridinol in six thoroughbred horses. Each horse received a single 20 mg dose of pridinol mesylate via the jugular vein, and plasma and urine samples were collected over 72 h. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) was used to quantify pridinol concentrations in plasma and urine, allowing for the calculation of pharmacokinetic parameters. A three-compartment model best fit the plasma elimination data. Using the Toutain model, irrelevant plasma and urine concentrations were estimated to be 0.00284 and 0.000612 ng/mL, respec...
Effects of the Sodium-Glucose Cotransporter-2 Inhibitor Velagliflozin on Insulin Concentrations in Horses With Insulin Dysregulation. Sodium-glucose cotransporter-2 inhibitors (SGLT2i) are promising treatments to manage hyperinsulinemia in horses with insulin dysregulation (ID). Objective: The SGLT2i velagliflozin decreases insulin concentration in horses with ID. Methods: Privately-owned adult horses (n = 37) with laboratory-confirmed ID (low-dose oral sugar test insulin concentration > 75 μIU/mL). Methods: Double-blind randomized placebo-controlled trial. Horses received placebo (n = 19) or velagliflozin 0.3 mg/kg PO q24h (n = 18) for 20 weeks (Study Period 1, SP1) immediately followed by a 20-week ...
A genome-wide investigation of insidious uveitis in Appaloosa horses. Equine recurrent uveitis (ERU), an inflammatory eye disease, is the leading cause of blindness among horses. Insidious uveitis, a form of ERU, is especially pervasive within the Appaloosa breed and is highly heritable (h = 0.68-1.0). To date only one risk locus, leopard complex (LP), has been identified, and it explained 0.16-0.33 of the heritability estimate, suggesting that insidious uveitis is a complex genetic disease within the Appaloosa horse breed with multiple unknown predisposing loci. Results: A genome-wide association study (GWAS) using relatedness, LP genotype, sex, and age as ...
In silico-derived Actinobacillus equuli-specific DNA markers and development of associated PCR assays. The ability to accurately and rapidly identify causative agents of infectious diseases facilitates precise treatment, improves clinical outcomes, and augments epidemiology studies. For many veterinary and zoonotic pathogens, however, simple molecular tests for species identification are not available. causes severe diseases, such as sleepy foal disease, septicemia, and meningitis in horses and pigs. can also cause severe diseases in humans bitten by infected animals. Existing identification methods are biochemical tests, 16S rRNA gene amplification followed by DNA sequencing, and MALDI-TOF ...
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