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Recent advances in intestinal helminth parasites of horses in the Asia-Pacific region: Current trends, challenges and future directions. Over the past 25 years, significant progress has been made in understanding and managing equine gastrointestinal parasites in the Asia-Pacific region, particularly in Australia and New Zealand. This review synthesises current knowledge of the epidemiology, diagnostic methods, anthelmintic resistance (AR), and control strategies for major equine intestinal parasites, including cyathostomins, Parascaris spp., Anoplocephala perfoliata, and Strongyloides westeri. Recent studies highlight substantial regional variation in parasite prevalence, egg shedding and cyathostomin population composition, sh...
Lectin Microarray-based Glycomics and Machine Learning Identify Shared Osteoarthritis Biomarkers in Humans, Dogs, and Horses. Post-traumatic osteoarthritis (PTOA) is a common sequela to joint injury in both humans and companion animal species such as horses and dogs. Despite the increasing prevalence of osteoarthritis (OA) in humans, investigation of glycosylation changes associated with OA remains in its infancy. Recent advances, such as lectin microarray analysis, now enable detailed glycan profiling in complex biofluids such as synovial fluid. Using lectin microarray technology, this study characterized glycosylation patterns in synovial fluid samples from healthy and OA-affected joints in horses, dogs, and humans...
Incorporating a Behavioral Medicine Approach in the Multi-Modal Management of Chronic Equine Gastric Ulcer Syndrome (EGUS): A Clinical Commentary. Equine gastric ulcer syndrome (EGUS) refers to mucosal gastric disease in horses, including equine squamous gastric disease (ESGD) and equine glandular gastric disease (EGGD), which present as two distinct disease entities differing in pathophysiology and approach to disease management. Both diseases are a source of pain in affected horses, partly explaining why EGUS continues to receive substantial attention in the equine medical, welfare and equitation research sectors. There is a complex interplay between EGUS and a variety of physical and psychological stressors. Horses with EGUS are often...
Intraocular Tumors in Horses: Diagnosis, Tumor Classification, Oncologic Assessment and Therapy. Intraocular neoplasia in horses is rare and only few case reports and small case series exist. Intraocular neoplasia has various clinical signs and includes important differential diagnoses in ocular disease. This narrative review of the current literature aims to provide a clinically relevant overview and classification of intraocular tumors in horses and adds a comparative oncological perspective concerning diagnosis, treatment and future considerations. The available clinical and imaging examination techniques allow for a reliable and differentiated investigation of the tumor, even in the s...
Newly designed PCR assays based on the ema-10 and ema-11 genes confirm the circulation of Theileria haneyi in horses in Brazil. Equine Piroplasmosis (EP) is a tick-borne disease caused by the protozoan parasites Babesia caballi, Theileria equi, and Theileria haneyi, characterized by intravascular hemolysis and associated systemic illness. Although T. equi and B. caballi have been widely reported in some regions of Brazil, data from other states are limited. Additionally, despite reports of T. equi genotype C, currently recognized as T. haneyi, has been identified in Brazil, there are no investigations using T. haneyi-specific molecular tools. This study assessed the presence of these three agents in horses from Baixada...
Safety and efficacy of a feed additive consisting of an essential oil derived from the flowering aerial parts of Salvia rosmarinus Spenn. (rosemary oil) for use in all animal species (FEFANA asbl). Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the safety and efficacy of an essential oil from the flowering aerial parts of Spenn. (rosemary oil) when used as a sensory additive in feed and in water for drinking for all animal species. Methyleugenol (< 0.039%) and estragole (< 0.027%) were detected in some batches of the additive. The EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) concluded that the use of rosemary oil is very unlikely to induce adverse effects in long-living and reproductive ani...
Abnormal Fetuin-A levels in obese horses are associated with activated TLR4/NF-ƙB/MAPK axis and depleted FBXW7 E3 ubiquitin ligase. Fetuin-A (FetA) is a multifactorial glycoprotein primarily synthesized by the liver with additional expression in adipose tissue, the abundance of which is tightly regulated by the FBXW7 E3 ubiquitin ligase. Recently, FetA has been implicated in the pathogenesis of insulin resistance and associated metabolic failures in humans through its potent and selective inhibition of insulin receptor tyrosine kinase activity, however, no studies have yet directly investigated its role in the development and progression of equine obesity. In this investigation, FetA levels were measured in serum, liver, a...
Reliability of three scoring systems for assessing quality of anaesthetic induction in horses. Several induction quality scoring systems (IQSS) have been described to evaluate drugs and risk factors of this anaesthetic period in horses, but no attempts to compare their reliability have been performed. Objective: To elucidate the reliability of three IQSS: the visual analogue scale (VAS), a simple descriptive scale (SDS), and a composite grading scale (CGS) proposed by the authors. Methods: Reliability study. Methods: Eight randomly selected video-recorded anaesthetic inductions from horses that underwent general anaesthesia were evaluated twice by four blinded evaluators with experience...
Ultrasonography and shear wave elastography of equine skin: a preliminary study. To noninvasively characterize skin thickness and elasticity in healthy horses using B-mode ultrasound and shear wave elastography (SWE) and to verify whether there are differences between the skin of stabled and outdoor horses. Unassigned: 10 clinically healthy horses were enrolled in this study. Five animals were housed exclusively indoors (indoor group), and 5 had temporary or permanent access to an outdoor environment (outdoor group). All horses underwent bilateral ultrasonographic examination of 3 anatomical regions: neck, withers, and girth region caudal to the elbow. Skin thickness was a...
Editorial: Advances in the application of technology for monitoring horse welfare and health. Flowchart illustrating interdisciplinary collaboration in animal research. A horse symbolizes the focus, with pathways connecting physiology, behavior, and environment to decision-making and regulatory indications. Data analysis, system understanding, and data interpretation lead to feedback and warning. Visual elements include sun, clouds, a light bulb, gears, and a graph.
Th1 and Th2 cells in equine endometrosis and their interactions with endometrial fibroblasts. Mare endometrosis is a chronic degenerative condition of the endometrium, primarily characterized by fibrosis, involving interactions among fibroblasts, immune cells, and epithelial cells regulated by cytokines and growth factors. T helper (Th)1 and Th2 cells seem to play a pivotal role in fibrosis. However, their roles in equine endometrial fibrosis remain unknown. This study explores Th1 and Th2 cell distribution across different stages of endometrium histopathological Kenney and Doig categories; and evaluated their secretome effects on non-fibrotic endometrium derived fibroblast functional ...
Analysis of Staphylococcal Diversity in the Skin Microbiota of Healthy Riding Horses. In animals, staphylococci constitute a significant part of the normal skin microbiota and mucous membranes. There is limited information available on staphylococci isolated from healthy horses. These skin-associated bacteria can be easily transferred between animals and horse riders via direct contact. Patients undergoing hippotherapy (i.e., medical or therapeutic sessions with horses) are especially at risk of being colonized by horse skin-associated bacteria. However, it remains unclear whether equine skin is colonized by antimicrobial-resistant (AMR) opportunistic pathogens, which may be o...
Expression pattern of the HIFα-family in equine chorioallantois during pregnancy and placental pathology. Equine placental dysfunction impairs fetal growth and disrupts pregnancy outcomes. Despite many advances in diagnosis, the molecular pathophysiology of equine placentitis and premature placental separation remains poorly understood. However, the hypoxia-inducible factor (HIF-α) pathway is related to placental hypoxia, and its modulation in placental diseases has been shown in other species. Therefore, we hypothesized that in conditions marked by equine placental dysfunction, oxygen deprivation in the chorioallantois membrane triggers the activation of the HIF-α pathway, which is related to m...
A national equine identification and traceability system for emergency preparedness and response in New Zealand. An essential component of a timely response to a disaster event or disease outbreak is an accurate understanding of the population at risk, its location, and the owners' contact details. In equines, this can be achieved through individual identification, via microchipping, and the registration of these individuals in a centralised database. This review outlines the development by the New Zealand Equine Health Association (NZEHA) of a centralised database for equines in New Zealand, the National Equine Identification and Traceability (NEIT) system, which is built using Companion Animal New Zeal...
What if Horses Were Humans? Comparing Rein Tension and Bit Pressures to Human Pressure Pain Thresholds. Bit pressure and rein tension-induced mouth pain in horses have recently become a significant welfare concern, fueling debates within the equestrian community and beyond. Evidence indicates that bits can cause pain-related behaviors and even oral lesions. Although studying pressure-induced pain in animals is challenging, the similarities in the physiology of pain processing (nociception) across mammals suggest that it is reasonable to assume that pain perception in humans and horses is principally comparable. Therefore, we compared human pressure pain detection thresholds (PPDTs) to reported r...
Use of preoperative computed tomography (CT) to plan repair of comminuted fractures of the middle phalanx in six Warmblood horses: Configuration, treatment and long-term outcome. To describe the additional information provided by computed tomography (CT) in planning and assisting repair of comminuted fractures of the middle phalanx (MP) in Warmblood horses. Methods: Case series. Methods: Six adult Warmblood horses. Methods: The case records of horses undergoing CT examination prior to internal fixation of comminuted MP fractures were reviewed. All horses underwent radiographic and preoperative CT examination. A standardized fast protocol (SFP) to assess CT images was used. Surgical repair consisted of fracture repair and proximal interphalangeal joint arthrodesis using...
Assessment of olfactory sensitivity in horses using positively conditioned scent. Differences in the ranges and capacities of sensory modalities cause horses to perceive their surroundings differently than humans. To date, the horses' sense of smell has been studied mainly regarding social and reproductive behaviour. The role of olfaction in horse management and use also seems to be of utmost importance. The aim of this study was to determine the response to a scent of different intensities by horses of different sexes and types (warmblood horses vs ponies). The study involved 21 adult mares and geldings, of which 15 subjects learned how to complete the required task and we...
Corneal Squamous Cell Carcinoma Arising From a Conjunctival Graft Scar in a Horse. To describe the case details of an equine corneal squamous cell carcinoma (SCC) arising from the central scar of a previous conjunctival pedicle graft. Methods: An 18-year-old Thoroughbred gelding, showing a progressive increase in diameter, depth, opacity, and pigmentation of a conjunctival pedicle graft scar of the left eye, 34 months after surgery. Methods: Complete ophthalmic examination, standard histologic and immunohistochemical evaluation of an incisional biopsy to formulate a definitive diagnosis. Carbon dioxide (CO) laser photoablation combined with topical mitomycin C treatment. R...
Controlling drug-resistant bacteria in Arabian horses: bacteriophage cocktails for treating wound infections. Antimicrobial resistance is a major global health issue requiring a coordinated response. This study investigated for the first time the prevalence, antimicrobial resistance phenotypes of bacteria causing infections in Arabian horses, and the potential of bacteriophage therapy for wound treatment. One hundred clinical samples from infected Arabian horses, presenting respiratory disorders, diarrhea, abortion, wound, and ocular infection, were examined using direct sample multiplex PCR and phenotypic methods. Antimicrobial susceptibility testing of the recovered isolates was performed using pane...
Genome-wide association study reveals candidate loci on ECA1 and ECA9 for withers height in Friesian horses. In Friesian horses, withers height is an important trait as a minimum has been set to be eligible to the studbook. Several loci for withers height have been identified in horses. However, withers height has not been studied in the Friesian horse. Therefore, our aim was to identify loci associated with withers height in the Friesian horse population. We performed a genome-wide association study using 70 K SNP data of 2192 Friesian horses. We found ECA1 and ECA9 to be significantly associated with withers height, explaining 19.6% and 3.5% of the phenotypic variance, respectively. In other hors...
Successful treatment of Rhodococcus equi P-type infection with subcutaneous abscessation in a foal. is a common causative agent of the septic arthritis, physitis, and osteomyelitis (SAPO) complex in foals, often resulting from hematogenous dissemination or perforating trauma. The early detection of osteomyelitis is challenging, and treatment has a guarded prognosis.A 3-month-old warmblood filly was presented with severe lameness, swelling, and palpable heat in the right cubital region. Ultrasonographic examination revealed signs suggestive of septic arthritis. Joint lavage and intra-articular injection of antibiotic were performed, but synovial swab cultures were sterile. Subsequently worse...
Efficacy of feed additives obtained from the leaves of Ginkgo biloba L.: Ginkgo tinctures for all animal species and ginkgo extract for horses, dogs, cats, rabbits and guinea pigs (FEFANA asbl). Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the efficacy of feed additives obtained from the leaves of L.: ginkgo tinctures as sensory additives for all animal species and ginkgo extract as a sensory additive for horses, dogs, cats, rabbits and guinea pigs. In previous assessments, a sensory analysis of ginkgo extract was performed, which showed that aqueous solutions of ginkgo extract have an intense aroma, significantly different from plain water. No evidence was provided to show that the additives would impart flavour to a food or fee...
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...
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...
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 ...
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 ...
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