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Therapeutic Horseback Riding for Youth With Autism and Psychiatric Comorbidities: A Randomized Trial. Autism spectrum disorder care is often complicated by co-occurring psychiatric symptoms. Equine-assisted services show promise for improving behavioral outcomes in this population. We aimed to examine benefits of equine-assisted services for youth with autism at higher risk for mental health interventions. Methods: A total of 236 youth with autism and psychiatric comorbidity (aged 6-16 years.) were enrolled in a randomized controlled multisite clinical trial, stratified by nonverbal IQ, and assigned to 1 of 3 intervention arms: therapeutic horseback riding (THR), no horse contact barn activity...
[Atlantoaxial luxation in a neonatal Warmblood foal]. Atlantoaxial luxation represents a rare but clinically relevant differential diagnosis in neonatal foals presenting with neurological abnormalities or dysphagia. This case report describes a newborn filly without apparent ataxia, but presenting with a stiff head-neck posture and milky nasal discharge. Clinical examination revealed a compromised general condition and abnormal swelling in the region of the fossa retromandibularis. Radiographic examination confirmed the diagnosis of an atlantoaxial luxation. Due to the poor prognosis the foal was euthanized. This case highlights the diagnostic ap...
Renal dysplasia in horses: 25 cases (1991-2021). Renal dysplasia (RD) is a congenital malformation with variable clinical expression and limited characterization in horses. Objective: We hypothesized that RD occurs in horses across a broad age range and may be overrepresented in specific breeds. Our objective was to describe clinical, clinicopathologic, and histopathologic findings in horses with RD. Methods: Twenty-five horses with RD identified from a veterinary teaching hospital between 1991 and 2021. Horses included neonates, young horses, and adults, with ages ranging from 0 days to 24 years and representing multiple breeds and both s...
Safety and efficacy of feed additives consisting of tinctures derived from the roots or leaves and stems of Althaea officinalis L.: Marsh mallow root tincture for use in all animal species and marsh mallow leaf tincture for use in horses and dogs (FEFANA asbl). Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the safety and efficacy of two tinctures obtained from the roots (marsh mallow root tincture) or leaves and stems (marsh mallow leaf tincture) of L. when used as sensory additives. The additives are water/ethanol tinctures, with a specified dry matter content of 2%-3% (w/w) (marsh mallow root tincture) and not more than 25% (w/w) (marsh mallow leaf tincture). Marsh mallow root tincture is intended for use in feed or water for drinking for all animal species, while marsh mallow leaf tincture is ...
Teaching Direction Control in Horse Riding: A Pre-Post Intervention Proof-of-Concept Study Using Multi-Modal Motor Learning Techniques. Many riders experience persistent communication problems with their horses, particularly in controlling speed and direction, despite extensive training. This proof-of-concept study employed a pre-test-post-test intervention design to examine the effectiveness of the Four-Step Riding Programme (FSRP) in developing clear rider-horse body language for direction control. Multi-modal motor learning techniques (MMLTs) were applied to five rider-horse dyads during four one-hour lessons to teach coordinated movement patterns necessary for directional accuracy. Rider-horse communication was evaluated b...
Antinociceptive effects of subcutaneous butorphanol administration in healthy horses. Subcutaneous (SQ) butorphanol administration maintains target plasma concentrations in horses longer than intravenous administration with fewer adverse effects. This study aimed to evaluate whether SQ butorphanol also produces clinically relevant antinociception in healthy horses. Unassigned: In a blinded, randomized, cross-over study, eight horses received 0.1 mg/kg butorphanol or equal volume (0.01 mL/kg) saline SQ in the cervical region. Thermal (TT) and pain pressure (PPT) thresholds at different body locations, along with physiological and behavioral variables, were assessed at baseli...
Effect of shod status on distal limb thermography in leisure horses. This study evaluated whether shod status affects distal limb surface temperature in 43 healthy leisure horses using infrared thermography. Thermographic images of 16 regions of interest were acquired at rest from shod (n=23) and barefoot horses (n=20), with temperatures corrected for ambient temperature and wind speed. Significant thermal differences existed between anatomical regions (P0.7). These findings indicate shod status has minimal impact on resting distal limb thermography in leisure horses.
Characterizing dietary and exercise management practices and inflammatory biomarkers in a population of recreationally managed horses in Pennsylvania. Horses evolved as slow-moving grazers for 30 to 40 million years, but domesticated horses often consume greater quantities of grains and concentrates to foster athleticism. The changes in diet and exercise are hypothesized to increase the risk of chronic inflammatory conditions. Objective: The objective was to characterize relationships between dietary and exercise management practices and acute phase proteins (APPs) in horses. Methods: We collected body condition scores, blood samples, and surveys of the horse management practices from 144 horses. Plasma serum amyloid A (SAA), C-reactive prot...
A generalized additive model using kinematic and demographic data provides an accurate and objective anesthesia recovery score in horses. To analyze kinematic data extracted from an inertial measuring unit to assess quality of recovery in horses emerging from general anesthesia. Unassigned: Horses undergoing anesthesia from February 2024 through March 2026 were enrolled in this study. Collected data from the inertial measuring unit included 3-axis acceleration, angular velocity, and orientation. Recoveries were evaluated by 3 scorers using a modified composite grading scale. The mean of the scores was used as the dependent variable. A Python pipeline was written to detect attempts to stand using the first derivative of the accel...
Plasma adrenocorticotropin concentrations vary with assay used in horses with and without pituitary pars intermedia dysfunction. Plasma adrenocorticotropin (ACTH) concentration is measured to support a diagnosis of pituitary pars intermedia dysfunction (PPID). However, baseline ACTH and ACTH concentrations after IV administration of thyrotropin releasing hormone (TRH) vary with season and assay used. To compare two ACTH assays (Scantibodies immunoradiometric assay [IRMA] and Immulite 2000Xpi chemiluminescent immunometric assay [CIA]) for diagnosis of PPID, ACTH was measured before and 10 minutes after administration of TRH in three groups of horses: 1) four young horses (6 ± 3 years, no hypertrichosis and a pituita...
Balancing training load, rest and musculoskeletal injury risk: a mathematical modelling study in Thoroughbred racehorses. Musculoskeletal injuries (MSI) in Thoroughbred racehorses are a leading cause of death and premature retirement, and are heavily influenced by training practices. Greater distances of high-speed galloping accumulated during racing campaigns are associated with MSI. Bone injury is the most common MSI, and understanding how training practices influence bone damage accumulation is critical for improving both horse welfare and racing outcomes. This study builds on an existing mathematical model of bone adaptation and damage to investigate the impact of different training programmes on bone injury ...
Quantitative assessment of specific bacterial taxa of the intestinal microbiota of healthy and diarrheic horses. Alterations in intestinal microbiota composition, as determined by DNA sequencing, are reported in horses with acute colitis compared with healthy horses. Objective: Changes in specific bacterial populations can detect overall intestinal disruption of the normal intestinal microbiota. Identify bacterial taxa that indicate intestinal dysbiosis or health in horses using quantitative PCR (qPCR). Methods: Thirty horses with undifferentiated colitis, 13 with colitis associated with Salmonella spp., 14 with antibiotic-associated diarrhea (AAD), 52 healthy horses from Canada and 48 from the United St...
The use and perception of hay nets and slow feeders by horse owners and handlers: findings from a United Kingdom survey. Hay nets and slow feeders are widely used in equine management, yet United Kingdom (UK) horse owners' perceptions of these devices are underexplored. An online cross-sectional survey (66 questions) was distributed via social media between 5 July and 6 August 2024, yielding 100 valid responses from UK horse owners. Data were analysed descriptively and using chi-square/Fisher's exact tests. Hay nets only were used by 42 respondents, slow feeders only by 26, and both by 32. Safety concerns were reported by 43% of hay net users, most often entanglement and dental issues, although 81% used hay nets...
Barriers to entry: A participatory science study of tick identification, monitoring, and physical barriers to reduce tick bites on horses. Equine tick-borne diseases pose increasing challenges due to climate change and expanding tick geographical ranges. With no vaccines available for Lyme disease or equine anaplasmosis in horses, tick bite prevention remains the primary control method. This two-year study evaluated tick species composition on horses in Pennsylvania and assessed the effectiveness of physical barriers for tick prevention through community-based participatory research. The study engaged horse owners as research partners. Year 1 (2022) established baseline tick surveillance across 45 participants with 60 horses, con...
Effect of canagliflozin treatment on β-cell responsiveness in insulin-dysregulated horses: a 4-week, multi-arm, double-blind, randomized clinical trial. The sodium-glucose co-transporter 2 (SGLT2) inhibitor canagliflozin (CAN) decreases hyperinsulinemia in insulin-dysregulated (ID) horses, but its effects on pancreatic β-cell responsiveness to glucose are unknown. Objective: Compare the effects of 2 CAN dosages (0.6 and 1.2 mg/kg) with placebo (PBO) on β-cell responsiveness to IV glucose in ID horses using a graded glucose infusion (GGI) test. Methods: Forty-two privately-owned ID horses. Methods: Randomized, multicenter, double-blind, parallel-group, multi-arm, PBO-controlled study. Horses underwent GGI testing before and after 4 weeks of...
Morphological and Behavioural Predictors of Motor Laterality in Domestic Horses: A Cross-Sectional Field Study. Motor laterality in horses affects performance, training, and welfare. A simple morphological marker for laterality would help riders, trainers, and veterinarians identify likely locomotor asymmetries early. This study tested whether observable morphological and behavioural characteristics were associated with rider-perceived motor laterality in domestic horses, using a cross-sectional observational field study design conducted in the Blida and Algiers regions of Algeria. The study included 100 regularly ridden domestic horses. Mane orientation, facial whorl characteristics, standing curvature...
Ultrasonography of the spleen, kidneys and bladder in healthy Mangalarga Marchador horses across different life stages. This study is the first breed-specific ultrasonographic reference values for spleen, kidneys, and bladder in Mangalarga Marchador horses from different life stages. Objective: The aim of this study was to establish a normal reference range of measurements of the spleen, kidneys and bladder, as well as to describe the anatomy and sonographic characteristics of these organs in Mangalarga Marchador horses. Methods: Abdominal ultrasound examinations were performed in 88 Mangalarga Marchador horses of both sexes, aged 1, 7 and 15 days, monthly from their 1st to the 11th month of age ando n their 1s...
Evaluating a novel automatic feeding device for hay provision in horses: behavioral outcomes in group and individual housing. This study evaluated a novel Automatic Feeding Device (AFD) for hay provision in group-housed and individually housed horses. Unassigned: In Phase 1 (P1), behavioral responses to ground hay feeding (Control-Hay) and to hay delivery through the AFD were assessed in three group-housed mares under two conditions: AFD continuously open (O-AFD) and AFD alternating between open and closed periods (OC-AFD). In Phase 2 (P2), four individually housed horses were used to evaluate the behavioral effects of three AFD opening-closing schedules: long opening (LO-OP), medium opening (ME-OP), and short openin...
Forage chemical composition drives early metabolic shifts in ponies fed different haylages. Rapid changes between feeds can cause dysbiosis and colic in horses. The metabolic consequences of transitioning between haylages (HY) are currently unknown. Objective: To characterise urinary and faecal metabonomics in ponies transitioned between HY varying in botanical composition and physiological age and to evaluate the speed of metabolic adaptation. Methods: In vivo experiments repeated Latin Square. Methods: Eight Welsh Mountain ponies were fed four HY (R1, R2, M1, M2) across 4 × 15-day periods; a structured 3-day (Days 13-15) changeover was observed: old:new 70:30, 50:50and 30:70....
Pass rates using the FEI noseband measurement device at British Dressage 2025 Championships. Appropriate fitting of equipment provides horse comfort and avoids compromising equine welfare. In May 2025, the Fédération Equestre Internationale (FEI) introduced an evidence-based measuring device that is passed beneath the noseband to ensure sufficient laxity. Objective: To study the use of the FEI noseband device during mandatory tack and equipment checks at British Dressage Championships. Methods: Observational. Methods: Noseband testing was observed for a total of 523 horses competing at the 2025 British Dressage National Championship, Middle Tour Championship and Area Festival Champi...
Economic assessment of burden of animal diseases in donkeys in Ethiopia. Working donkeys play a crucial role in Ethiopia's household and agricultural economies but they carry a massive, neglected burden of disease. There is currently limited understanding of the size and scale of this burden. This study aimed to quantify the burden of disease in working donkeys in Ethiopia using the Animal Health Loss Envelope (AHLE) metric. The AHLE measures all cause disease burden by estimating the gap between actual production and potential output in an ideal, animal disease-free scenario. An enterprise budget analysis was conducted under two health scenarios (current and ideal...
Antimicrobial stewardship priorities and prescribing in Australian equine practice. Antimicrobial resistance is a global health crisis that needs to be addressed by all areas of human and animal health sectors to safeguard effective antibiotics into the future. Understanding current antimicrobial prescribing patterns and veterinary antimicrobial stewardship (AMS) priorities is crucial for effective stewardship program design and sustainable uptake. Objective: To identify focus areas for stewardship interventions, implementation, resource allocation, and future campaign targets for equine practice. Methods: Cross-sectional study of equine veterinarians in Australia. Methods: A...
Cumulus cell DNA fragmentation as non-invasive biomarker of equine oocyte quality in in vitro embryo production. The efficiency of in vitro embryo production in animal species is constrained by the absence of practical, non-invasive biomarkers to assess oocyte quality. Cumulus cell DNA fragmentation index (CC-DFI) has been proposed as a biomarker in humans, but data in animals remain limited. Objective: This study investigated the association of CC-DFI with in vitro maturation (IVM) and intracytoplasmic sperm injection (ICSI) outcomes in horses, and its relationship with mare-related factors, autumnal transition period, cumulus cell viability, and cumulus expansion. Methods: Cumulus-oocyte complexes (COC...
Optical neuronavigation facilitates transcranial surgical access to the equine pituitary gland. To evaluate the feasibility of an optical neuronavigation-guided transcranial approach to the equine pituitary gland, compare pituitary tissue acquisition using MRI versus CT guidance, and assess an automated tissue resection device versus a standard biopsy needle. Unassigned: 13 equine cadaver heads from horses euthanized for reasons unrelated to the study were used. A fiducial array was secured to the frontal bone before imaging; 7 heads underwent CT, and 6 heads underwent MRI. Images were imported into a neuronavigation system for 3-D reconstruction, surgical planning, and registration. Eig...
The effects of feeding frequency on glycemia and insulinemia in moderately exercised young horses. Concentrates are typically fed twice daily to supplement forages in horses to facilitate management, especially those with higher energy needs, but high-grain meals can contribute to digestive and metabolic challenges, including insulin dysregulation. This study investigated the effects of feeding frequency on glycemia, insulinemia, and insulin sensitivity measured by an oral sugar test in moderately exercised young horses. Thirty-two healthy Quarter Horses (2-3 years old) were assigned to either traditional feeding (TF; two grain meals/day) or fractioned feeding (FF; automated grain delivery...
Cervical articular process joint versus ventral cervical stabilization in horses: A biomechanical study. To determine the biomechanical properties and modes of failure of a single level equine cervical spine immobilized with unilateral or bilateral articular process joint (APJ) stabilization, ventral cervical stabilization (VCS) and non-stabilized controls. Methods: Ex vivo experimental study. Methods: A total of 24 equine cadaver cervical spines. Methods: Cervical spinal units (C4-C5) were randomly assigned to four groups (n = 6/group): unilateral APJ stabilization, bilateral APJ stabilization, VCS using pedicle screws and rod constructs, or non-stabilized. Non-destructive testing assessed k...
Melatonin as a daily rhythm control signal for glucose homeostasis and insulin secretion in horses. An involvement of melatonin in the regulation of glucose homeostasis and insulin secretion in pancreatic β-cells has been proposed. To evaluate the features of the daily rhythms of plasma melatonin, blood glucose, and insulin in horses, ten clinically healthy Italian Saddle geldings, 9-10 years old with a mean body weight of 490 ± 25 kg, were enrolled. The animals were housed in individual boxes under natural environmental conditions (sunrise 06:10; sunset 18:10; 12-15°C, 77% RH). All horses were cannulated the day before the start of the study for sample collection, which was perfo...
Platelet-rich plasma exhibits antibacterial and anti-inflammatory effects in an in vitro donkey endometritis model. Infectious endometritis, mainly caused by Escherichia coli (E. coli) and Streptococcus equi subsp. zooepidemicus (SEZ), significantly impairs donkey reproductive performance. Platelet-rich plasma (PRP) shows promise as an anti-inflammatory and antibiotic alternative. Objective: To evaluate PRP's antimicrobial efficacy against key pathogens and assess its anti-inflammatory and tissue repair properties in an in vitro endometrial model. Methods: Non-randomised in vitro and explant experiments. Methods: In in vitro antibacterial assays, the inhibitory effects of PRP on the growth of E. coli and SE...
Serum amyloid A alone or in combination with white blood cell count and fibrinogen is associated with inflammatory disease status in horses undergoing elective anesthesia. The objective of this study was to assess the clinical utility of common systemic inflammatory markers (WBC count [WBCC], plasma fibrinogen, and serum amyloid A [SAA]) for the detection of disease in patients undergoing general anesthesia. Unassigned: A retrospective review of 1,002 surgical case records (February 2021 to June 2023) was performed. Systemically stable equine patients undergoing elective orthopedic and soft tissue procedures and that had WBCC, fibrinogen, and SAA evaluated preoperatively were eligible for inclusion. Disease status (healthy vs disease) was recorded for each case ...
Novel serum biomarkers provide evidence for an involvement of the CCL3:CCL5 axis in fatal musculoskeletal injuries in Thoroughbred racehorses. Fatal musculoskeletal (MSK) injuries in Thoroughbred (TB) racehorses adversely affect equine welfare, negatively impact public acceptance of horse racing, and cause severe economic losses for the racing industry. Biomarker assays predicting the risk of MSK injuries are currently not available. Our hypothesis was that immune system and inflammatory markers are indicators of fatal MSK injuries in TB racehorses. Unassigned: Serum samples from TB racehorses with fatal (n = 44) and nonfatal injuries (63) were collected. Serum from 2- to 5-year-old TBs submitted for annual equine infectious anemia t...
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