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Traumatic brain abscess due to Streptococcus equi subspecies zooepidemicus in a Foal. Bacterial infection of the equine central nervous system is rare. This report describes the clinical features, computed tomography (CT) findings, and postmortem results of a 3-month-old female Quarter Horse with an intracranial abscess. Clinical signs included seizures, depression, and bilateral blindness. CT imaging demonstrated a large space-occupying lesion in the left cerebral hemisphere, associated with a frontal bone fracture. Necropsy and histopathology confirmed the presence of an abscess secondary to head trauma. Bacterial culture identified Streptococcus equi subsp. zooepidemicus as...
Cushing’s Disease in the Animal Kingdom: Translational Insights for Human Medicine. Cushing's disease (CD) is a rare neuroendocrine disorder caused by ACTH-secreting pituitary adenomas, presenting significant diagnostic and therapeutic challenges. Given the evolutionary conservation of the hypothalamic-pituitary-adrenal axis, this review explores the translational value of spontaneous CD forms in dogs, horses, cats, small mammals, and rats, as well as of experimental models in mice, rats, and zebrafish. Dogs are the most studied, showing strong molecular and clinical similarities with human CD, making them valuable for preclinical drug and diagnostic research. While equine an...
Comparison of Two Surgical Techniques for the Treatment of Equine Hindlimb Proximal Suspensory Desmopathy. Suspensory desmopathy is a frequently documented cause of lameness in performance horses; proximal suspensory desmopathy is the most frequent site of injury in dressage horses [...].
Progress in serology and molecular biology of equine parasite diagnosis: sustainable control strategies. Internal parasitic infections are a persistent challenge for horse owners, in the absence of effective vaccines and the growing challenge of drug resistance, leading many researchers to view current control strategies as unsustainable. Despite slow progress over the past two decades, effective parasitic diagnosis remains crucial for controlling infections and preventing the growing issue of drug resistance. This review examines the research progress in serological and molecular biological diagnostic methods for major equine parasites. Currently, most diagnostic techniques are based on genes su...
Equine Sarcoid Arising From the Medial Caruncle With Invasion of the Third Eyelid in a Quarter Horse Gelding. To describe the clinical and histologic features of a sarcoid arising from the medial caruncle with spread to the third eyelid of a horse. Methods: A 20-year-old Quarter Horse gelding. Methods: An incisional biopsy of the medial caruncle mass was initially performed, with histopathology suggesting a sarcoid or other spindle cell neoplasm. The mass grew rapidly following the biopsy, expanding to affect the third eyelid and adjacent superior palpebral conjunctiva. A complete third eyelid and medial caruncle excision with resection of affected palpebral conjunctiva and adjunctive cryotherapy was ...
A cohort study of nutritional secondary hyperparathyroidism in horses in Hawai’i. Equine nutritional secondary hyperparathyroidism (NSHP, Bighead Disease) is a consequence of diets with abnormal calcium: phosphorus ratios. With the widespread availability of fortified feeds and legume forage, the disease has largely disappeared. The Hawaiian Islands are unique in that legume forage is largely unavailable and pastures have high oxalate concentrations. This was a cohort study that included seventeen adult horses imported from the continental US to the Waiki'i region, Hawai'i that grazed on kikuyu grass pastures. Plasma ionized calcium and parathyroid hormone concentrations at...
A case-matched controlled retrospective performance indexed analysis of Thoroughbred racehorses that underwent surgical repair of proximal phalanx and third meta-carpal/tarsal condylar fractures. Standing fracture repair has become established as an acceptable technique with a good long-term prognosis. However, no study has compared racing outcomes with case-matched controls. Objective: To compare racing outcomes between a large dataset of horses undergoing standing fracture repair against case-matched controls. Methods: Retrospective case-matched controlled comparative study. Methods: Thoroughbred racehorses undergoing standing repair of distal limb fracture(s) over 10 years (2012-2022) at five hospital centres across North America and Europe were included. Data retrieved included...
MHC compatibility influences the interaction between different types of equine mesenchymal stem/stromal cells and the local immune response. The allogeneic administration of equine mesenchymal stem/stromal cells (MSCs) has numerous advantages over autologous therapy, but their interactions with the patient's immune system need to be further elucidated. These interactions can be influenced by factors such as the compatibility between donor-receptor for the major histocompatibility complex (MHC) and by the MHC expression levels, which can change under different conditions like inflammatory exposure and chondrogeneic differentiation. In this study, we evaluated the local immune response induced by chondrogeneically differentiated (MSC...
Pharmacokinetics of orally administered calcium dobesilate in Warmblood horses. Calcium dobesilate has recently been used for treating lameness in horses because it enhances microvascular processes and reduces intraosseous pressure. Lameness caused by disorders in bone metabolism and increased intraosseous pressure, such as navicular disease, osseous cyst-like lesions and pedal bone oedema, are commonly treated with rest, anti-inflammatory agents and surgery. Calcium dobesilate has the potential to influence the pathophysiology of these diseases, thereby improving healing. To determine whether calcium dobesilate and its acting agent calcium 2,5-dihydroxybenzene sulfonate ...
Antimicrobial prescribing guidelines for horses in Australia. The growing problem of antimicrobial resistance also affects equine veterinarians with increasing frequency. Antimicrobial stewardship and responsible prescribing are essential for a future in which effective antimicrobials are available, as it is unlikely that new antimicrobials will become available for use in horses. While antimicrobials are commonly used to treat equine infections, complications with therapy are also relatively common. Antimicrobial-associated diarrhoea, immune-mediated diseases, and nephrotoxicity have been reported as sequelae of antimicrobial therapy in equine practice....
Effects of Sedation on Rectal Temperature During Equine Dental Procedures Performed in Cold to Warm Ambient Temperatures. Sedation is important for safe equine dental procedures, but it is unknown if there is a higher risk of sedation causing hypothermia in procedures performed during cold months. The authors hypothesize that sedation for a dental procedure will significantly decrease rectal body temperature in cold as compared to warm ambient temperatures. Adult equids ( = 246), from a private equine dentistry practice, that underwent dental equilibration, were selected for the study. Each horse's weight was estimated and sedation was administered intravenously (0.01 mg/kg detomidine and 0.01 mg/kg butor...
Decoding Leishmania in equines: A comparative analysis of molecular targets. Parasitic diseases caused by Leishmania spp. create considerable health concerns in animals, resulting in a considerable financial impact. They causes a complex infection in equines, affecting weight gain, skin, liver, and spleen. To date, there is a lack of reports on the occurrence of Leishmania in equines in Southern Punjab, Pakistan, highlighting the need for molecular epidemiological surveillance. The current study focused on determining the prevalence of Leishmania in the equine population from District Rahim Yar Khan, Southern Punjab, Pakistan, through amplification of mitochondrial (Cy...
Hippotherapy in the Treatment of CMD and Bruxism in Dentistry. Dysfunctions and disorders of the craniomandibular system are accompanied by pathophysiological changes of muscle groups in the throat/neck and facial area, e.g., pain in the jaw and muscles of mastication and disturbance of occlusion, leading to teeth injury (loss of dental hard tissue, fractures/sensibility disorders, etc.). For muscular dysfunctions, even in the context of psychosomatic disorders and chronic stress, hippotherapy is particularly suitable, since it helps actively to relieve muscle tensions. In the current project we combined hippotherapy with progressive muscle relaxation (PM...
Seropositivity for Pathogenic Leptospira in Dogs, Cats, and Horses at a Teaching Veterinary Hospital in Southern Chile. At a veterinary hospital in southern Chile, we conducted an epidemiological study involving domestic dogs, cats, and horses to determine the seropositivity for pathogenic spp., identify the infecting serogroups, measure antibody titers, and characterize seropositive animals by sex and age. None of the sampled animals showed clinical signs of leptospirosis. The microscopic agglutination test, using a panel of eight serogroups, was used for diagnosis. The seropositivity was 36.5% (95% confidence interval [CI] = 24.5-48.4) in dogs, 12.9% (95% CI = 2.6-23.1) in cats, and 45.2% (95% CI = 30.1-60.2...
Early transatlantic movement of horses and donkeys at Jamestown. Domestic equids were central to the initial colonization of the Atlantic coast of the Americas, a process partially chronicled by historical records. While Spanish colonists brought horses to the Caribbean decades earlier, settlement of the English colony at Jamestown, Virginia, was among the first dispersals of horses to the eastern seaboard. Archaeozoological analysis of identifiable domestic equid remains from two contexts associated with the initial occupation of Jamestown demonstrates intense processing and consumption of the first Jamestown horses during the "Starving Time" winter of 160...
Mitohormesis and Regeneration: Natural Compounds Chlorogenic Acid (CGA) and Isovanillic Acid 3-O-sulfate (IVAS) Boost Muscle Cell Recovery in the Equine Athlete Model. Skeletal muscle satellite cells ( SCs), essential for muscle regeneration, are a valuable model for studying exercise-induced stress relevant to human athletes. This study examined the effects of two natural compounds-chlorogenic acid (CGA) and isovanillic acid 3-O-sulfate (IVAS)-increasingly recognized as components of modern, nature-based recovery strategies. Their combination (Hybrid) was also tested on equine model of skeletal muscle satellite cells (ESCs) exposed to heat shock (40 °C, 1 h), mimicking exercise stress. Cells were treated with CGA (0.005%), IVAS (0.0005%), or both for 24...
Time-activity budget in horses and ponies: A systematic review and meta-analysis on feeding dynamics and management implications. The time-activity budget is a key indicator of animal welfare. This meta-analysis integrated 14 studies (1979-2020) with 364 horses under wild, natural-living, and stabled conditions to evaluate feeding, resting, standing, and locomotion. Objective: The study aimed to categorize daily behavioural patterns in equines, with emphasis on feeding behaviour. Methods: Fixed and random effects models, forest plots, and ANOVA assessed the influence of management, sociality, sex, age, body size, and feeding type. Results: Feeding was greater in free-ranging (56 %) than stabled horses (38 %; p < 0.000...
The predictive ability of blood-based biomarkers to detect bacteremia in hospitalized neonatal foals. Early and accurate identification of septicemia in neonatal foals improves survival. In human medicine, the neutrophil-to-lymphocyte ratio (NLR), neutrophil-to-monocyte ratio (NMR), monocyte-to-lymphocyte ratio (MLR), and plasma cell-free DNA (cfDNA) aid in early bacteremia detection. This study evaluated the diagnostic utility of these markers in conjunction with other clinical and hematological parameters in hospitalized foals < 5 days old to predict positive blood culture at admission and to distinguish between Gram-positive, Gram-negative, or polymicrobial bacteremia. A total of 391 f...
Ionic composition of gastric reflux and small intestinal fluid in horses: implications for fluid replacement. Small intestinal (SI) distension and gastric reflux (GR) are common in horses with mechanical and functional ileus. Removal of GR results in fluid/ion losses. Objective: 1) Determine the capacity of healthy SI; 2) measure ion concentrations in normal SI fluid, GR, or fluid from SI undergoing resection. The authors hypothesized that Na and Cl concentrations would be lower and higher, respectively, in GR as compared to SI fluid from healthy horses, while there would be little difference in K concentration. Methods: Observational study: two to 15 meters of SI from 15 horses were distended with wa...
Adjuvant combination enhances immune response of equine influenza virus vaccine in horses. Despite routine vaccination, equine influenza outbreaks occur due to disparities of virus strains between vaccine and field, and immunity gaps between vaccinations. Objective: To evaluate whether a combination of adjuvants can enhance immune responses to equine influenza virus (EIV) vaccines. Methods: In vivo experimental study. Methods: Eight mixed-breed horses were immunised intramuscularly with a recombinant canarypox-based EIV vaccine, either alone or in combination with monophosphoryl lipid A (MPL) and polyinosinic-polycytidylic acid (poly I:C). A single vaccine dose was administered, and...
Detection of Neorickettsia risticii in antemortem fecal and postmortem fetal samples, with genomic insights from complete genome sequencing of a strain recovered from an aborted equine fetus. Neorickettsia risticii (N. risticii) is an obligatory intracellular bacterium that causes Potomac horse fever (PHF), a disease clinically characterized by diarrhea, pyrexia, and laminitis in horses. Although sporadic reports of N. risticii infection have been linked to abortion in mares, a detailed retrospective study, including genomic analysis of the pathogen from an aborted fetus, has not been published. This study examined 546 fecal samples from clinically ill horses (January 1, 2017-December 31, 2024) and 833 colon samples from aborted equine fetuses (September 20, 2018-December 31, 2024)...
A serological test based on mutated recombinant Fasciola hepatica cathepsin L protease for the diagnosis of equine fasciolosis. Fasciola hepatica is a common trematode parasite of livestock in many regions, causing significant economic losses and affecting animal welfare. Horses rarely develop patent liver fluke infection. However, liver damage can affect animal health and welfare. Therefore, F. hepatica infection in horses may be underreported. Recently, a serological test for the antibody detection has been reported based on recombinant parasite cathepsin L1 (FhCL1) protease. Here, we optimized this enzyme-linked immunosorbent assay (ELISA) for antibody-detection in horses with equine fasciolosis based on recombinant...
Cortisol and heart rate response of mares during the in-hand breeding procedure with and without restraint. In-hand breeding involving restraint methods is likely the most common practice in the horse breeding industry worldwide. However, welfare issues that arise from such management have not been investigated in detail. Objective: (1) To investigate whether the mares show increased stress responses during in-hand breeding using (a) a lip twitch and (b) hobbles. (2) To evaluate if the use of restraint methods influences the mare's expression of oestrous behaviour. Methods: Intra-individual cross-over design. Methods: Six Franches-Montagnes stallions and 10 warmblood mares were used in these experim...
[Unilateral leiomyoma in the spermatic cord – a reason for intermittent colic in stallions?]. A 19-year-old Oldenburg stallion was presented multiple times over the course of several months with recurrent colic signs. At each examination, an enlargement of the scrotum was noted, which could not be further specified by palpation and ultrasonographic examination. The increase in circumference was noted both on palpation and on inspection and the size remained unchanged throughout. No special findings were noted during the general examination and the special examination of the colic patient. A few months after the first onset of symptoms, a chicken egg-sized mass was palpated on the right...
PPARγ Agonism Modulates Synovial Macrophage and Cartilage Responses in an Equine Model of Synovial Inflammation-Implications for Joint Therapy. Synovitis resolution is critical for joint homeostasis and prevents the progression of osteoarthritis (OA). Treatments like NSAIDs and intra-articular corticosteroids relieve symptoms by blocking pro-inflammatory mediators, but also impair the production of pro-resolving mediators, contributing to the likelihood of chronic synovitis. PPARγ signaling is an essential mechanism of synovitis resolution, which is decreased in OA tissues. To evaluate the potential of PPARγ agonists to promote pro-resolving pathways, equine macrophages cultured in autologous, normal, or inflamed synovial fluid ( = ...
In vitro and in vivo effects of Acacia mearnsii De Wild extract for cyathostomin control in horses. Anthelmintic resistance has led to the use of organic extracts as alternative methods of parasite control. Objective: The study aimed to assess the effects of Acacia mearnsii extract (tannin) on the control of cyathostomins in horses, both in vitro and in vivo. Methods: Thirty Pantaneiro horses naturally infected with cyathostomins were sourced from two distinct farms, designated as Farms A and B. At the start of the study, all third-stage larvae were cyathostomins, and an egg hatchability test (EHT) was performed using fecal samples from horses on both farms. Two randomized 28-day field studi...
Evaluating efficacy and strongyle egg reappearance period after ivermectin treatment in a Hungarian stud farm. Horses remain globally at constant risk of strongylid infections, with cyathostomins being particularly prevalent and abundant. It is essential to routinely monitor the efficacy of anthelmintics against equine nematodes. This study aimed to evaluate the efficacy of ivermectin against equine strongyles and estimate the strongyle egg reappearance period (ERP) following ivermectin treatment for the first time in Hungary. Fecal samples were collected from 57 Thoroughbred mares before treatment and at 2, 4, 5, 6, and 7 weeks post-treatment at a Hungarian National Stud Farm. Fecal egg counts (FECs)...
Cat, dog, and horse allergies: emerging new insights. Animal allergens, particularly those from cats, dogs, and horses, are significant risk factors for the development of allergic diseases in childhood. Managing animal allergies requires allergen avoidance and, when this is not feasible, specific immunotherapy. Patient history remains the cornerstone of diagnosis, providing the foundation for diagnostic algorithms. Extract-based tests, such as skin prick tests and specific IgE measurements, are essential for confirmation and screening. However, traditional extract-based diagnostic methods have notable limitations, as they are unable to distingui...
Stable microclimates and autonomic modulation in horses housed in different stable architectures during monsoon in a tropical environment. The impact of climate conditions and stable design on horses housed in individual stalls plays a significant role in their well-being, especially in tropical climates. Limited information exists regarding their conditions during the monsoon season. Objective: This study focused on the stable microclimate and autonomic regulation of horses kept in different stable architectures during the monsoon in a tropical setting. Methods: Twenty-two horses were assigned to one of three stable designs, each offering unique microclimates, including relative humidity, air temperature, and various levels of n...
Risk factors associated with gastric disease prevalence in extensively kept horses in Iceland evaluated four times in a calendar year. It is unknown whether the high prevalence of Equine Squamous (ESGD) and Equine Glandular (EGGD) Gastric Disease in extensively grazed Icelandic horses in the autumn/winter is seasonally driven. Objective: To determine the prevalence of, and risk factors for, gastroscopically significant ESGD (ESGD:score of ≥2/4); gastroscopically severe ESGD (ESGD:score of ≥3/4) and gastroscopically significant EGGD (EGGD:score of ≥1/2) in extensively pasture-managed Icelandic horses at four timepoints. Methods: Prospective longitudinal cohort. Methods: Gastroscopy was undertaken in 80 Icelandic horses (...
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