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Substance withdrawal during psychotherapy incorporating equines: A preliminary investigation of the role of neurotransmitters during treatment. Substance withdrawal presents a barrier to substance use disorder (SUD) recovery in part due to symptoms implicating neurotransmitters and their metabolites. Despite this relationship, research investigating alternative treatments such as psychotherapy incorporating equines (PIE) have primarily targeted vital signs and cortisol concentrations. Previous research has also proposed benefits of human-horse physiological coupling, but the role of neurotransmitters in the relationship between humans and horses during PIE has not yet been investigated. The purpose of this study was to characterize ne...
Evaluation of Subjective Assessment of Right Heart Size and Function Using Standard 2D-Echocardiographic Recordings in Horses With and Without Pulmonary Hypertension. Echocardiographic evaluation of right heart (RH) size and function in horses is challenging and relies on subjective assessment. Objective: Evaluate inter- and intra-rater agreement of subjective assessment of RH size, RH function, and the presence of pulmonary hypertension (PHT) in horses. Assess subjective RH changes with and without PHT and the influence of observer experience. Methods: Healthy horses (n = 30) and horses with Doppler measurements suggesting the presence or absence of PHT (n = 30 each). Methods: Nine standard echocardiographic recordings were analyzed by experienced ...
Analysis of dental dust and aerosol emissions during odontoplasty: assessing potential respiratory health risks. Equine dental disorders, such as sharp enamel points and focal overgrowths, are common in horses and are often treated with motorized dental grinding tools. These tools, while effective, produce dust and aerosols that may pose health risks to veterinarians and nearby individuals. This study aimed to assess the health risks associated with dental dust and aerosols generated during equine odontoplasty. Using a realistic setup, air concentrations of inhalable and respirable dust, crystalline silica, and airborne microorganisms and endotoxins were measured in 12 groups of horses undergoing odontop...
Horse handlers’ knowledge, attitudes, and perceptions of African horse sickness in South-West, Nigeria. African horse sickness (AHS) is endemic in Nigeria. Despite this, little is known about the perspective of horse handlers in Nigeria regarding AHS. The study aimed to evaluate the knowledge, attitudes, and perceptions (KAP) of horse handlers in Southwest Nigeria regarding AHS. A cross-sectional survey study was conducted, which involved convenient sampling of 131 horse handlers in Lagos and Oyo States by February - April 2024. The pre-validated questionnaires were administered via face-to-face interviews, covering demographics, knowledge of AHS transmission, clinical signs, prevention and cont...
Mapping the epidemiology and intensity of Parascaris equorum infection in equids in Erbil Province, Iraq. This study investigated the prevalence, intensity, and associated risk factors of Parascaris equorum (P. equorum) infection in equids using both parasitological and molecular methods. Data on age, sex, body condition, and housing conditions were systematically collected to evaluate their influence on infection risk. Fecal samples from 294 equines (148 horses, 47 mules, 63 donkeys, and 36 ponies) were examined microscopically using direct wet-mount and flotation techniques, with infection intensity quantified using the McMaster technique to determine eggs per gram (EPG). Molecular confirmation ...
What ‘knot’ to do whilst castrating donkeys. A retrospective comparison of ligation method on spermatic cord haemorrhage in 261 donkeys castrated by vet students in rural Malawi using transfixing and modified millers’ ligatures. Special considerations for donkeys undergoing castration compared with horses include the presence of large scrotal vessels, larger testicular artery and vein and the consequential increased risk of post-operative haemorrhage which necessitates spermatic cord ligation. Objective: This retrospective study compares haemorrhagic complication rates between two methods of spermatic cord ligation in donkeys castrated in rural Malawi. Methods: All donkeys presenting to Veterinary Education Malawi / Lilongwe Society for the Protection and Care of Animals rural large animal outreach clinics for castrat...
Usefulness of a Computer-Aided Learning Module for Teaching Radiology of the Equine Foot to Clinical Veterinary Students. Lameness in horses resulting from foot pathology is very common. When investigating the cause of a lameness localised to the foot, the first step is most frequently radiographic imaging. Therefore, being able to identify normal anatomy and recognise pathology on radiographs is important for a veterinary medicine student to learn. Computer-aided learning (CAL) is becoming increasingly utilised in the teaching of students on medicine-related courses, especially post-COVID where online learning has been continued in hybridisation with in-person teaching.In this study, a low-cost CAL module was cr...
Serologic and molecular survey of Toxoplasma gondii in Baghdad Province, Iraq. A prevalent contagious pathogenic parasite that can lead to major health issues is . Unassigned: The present study aimed to detect the parasitic immune response and the existence of genomic DNA in the blood of a -positive equine. Unassigned: Thirty serum samples from horses suspected of having toxoplasmosis were collected from the Al-Rusafa neighborhood in Baghdad. To quantitatively investigate toxoplasma antibody levels in horse serum, an ELISA was used to evaluate immunoglobulin G (IgG) levels. Conventional (PCR) was used to identify DNA. Unassigned: The blood levels of IgG immunoglobulin i...
Rabies in livestock in the United States (2012-2021). Rabies in livestock in the United States (US) poses a significant public health concern due to the potential for human exposure and economic losses to producers. Understanding the epidemiology of rabies in livestock supports broader One Health goals by enhancing early detection of viral incursions and protecting both animal and human health. This study assessed the epidemiology of rabies in livestock in the US from 2012 to 2021 using surveillance data reported to the National Rabies Surveillance System. A sensitivity analysis was conducted to estimate economic losses, including livestock value...
Regulatory Integrity and Welfare in Horse Sport: A Constructively Critical Perspective. This commentary evaluates contemporary equestrian sport governance through the lens of equine welfare science. Drawing on evidence from the FEI Sport Forum 2025 debates, the IFHA Racing Integrity Handbook, media coverage of horse sport, recent scientific presentations, regulatory texts, and published research, we identify systemic shortcomings in how horse welfare is assessed, prioritised, and protected. Key issues include reliance on performance as a proxy for welfare, inadequate "fit-to-compete" protocols, neglect of horses' mental states, coercive tack and equipment practices (e.g., double ...
Novel lineages of bacteria with reduced genomes from the gut of farm animals. Genome reduction and associated metabolic deficiencies have been described in various lineages of parasitic and symbiotic microorganisms that obtain essential nutrients from their partners, and in some free-living microorganisms that inhabit stable environments. The animal gut is a relatively stable ecosystem, characterized by an abundance of organic substances and a high concentration of microorganisms, which provides favorable conditions for the survival of microorganisms with reduced genomes. Metagenomic analysis of 49 samples of feces of farm animals (cows, sheep, yaks, and horses) reveale...
Risk Factors Associated with the Prevalence of Antibodies Against Brucellosis in Equids from Western Pará, Brazil. This study aimed to determine the prevalence of antibodies against equine brucellosis in three distinct equid groups (farm animal, urban carthorse, and sport horse) in Western Pará, Brazil, and to identify associated risk factors. A cross-sectional study, involving 75 farms across 14 municipalities, sampled 1069 equids composed of urban carthorses and sport horses. Serum samples were tested for antibodies against spp. using the buffered acidified plate antigen (BAPA) test for screening, followed by the serum agglutination in tubes with 2-mercaptoethanol (2-ME) for confirmation. Univariate an...
CENP-A and centromere evolution in equids. While the centromeric function is conserved and epigenetically specified by CENP-A, centromeric DNA, typically composed of satellite repeats, is highly divergent and rapidly evolving. In the species of the genus Equus (horses, asses and zebras), also known as equids, the numerous centromeres devoid of satellite repeats enabled us to carry out molecular analysis of centromeric chromatin establishing a unique model system for mammalian centromere biology. In this review, after a brief description of the rapid evolution of equids, we outline one of our most relevant initial discoveries: the posit...
Laryngoscopic evaluation of arytenoid movements in pure Arabian horses. The equine larynx can be affected by a variety of diseases that may interfere with upper respiratory tract patency. Laryngeal hemiplegia is a well-known disease in large-sized equine breeds and its occurrence in Arabian horses has not been thoroughly investigated. Unassigned: To endoscopically assess arytenoid movements in pure Arabian horses. Unassigned: A total number of 38 pure Arabian horses were examined. When the horse was unsedated, the laryngeal arytenoid movement was assessed using a laryngoscope, and a grading score was assigned accordingly. Unassigned: Evidence of laryngeal movement...
Identifying insulinemic responses of ID horses offered varying levels of NSC and meal-sizes. Feeding small meals (∼1 g/kg BW DM basis) providing >10% nonstructural carbohydrates (NSC; starch + water soluble carbohydrate; WSC) has resulted in an augmented insulin response (AIR) in insulin dysregulated (ID) horses, but it’s unclear if AIR reflects NSC content or the g NSC/kg BW/meal. The insulinemic responses of ID (n = 7) and non-insulin dysregulated (NID; n = 8) horses fed four feeds (A = 6.8% NSC; B = 14.9% NSC; C = 35.5% NSC; D = 44.6% NSC) at three levels of NSC intake (0.06, 0.11-0.12 and 0.17-0.18 g/kg BW) were evaluated in a randomized Latin square design across two phas...
Comparative genomic and virulence analyses of a novel sequence type 420 Streptococcus equi subspecies zooepidemicus isolated from donkey. The zoonotic pathogen subspecies (SEZ) frequently colonizes equines harmlessly but can occasionally cause disease or cross species barriers. Currently, growing evidence suggests SEZ can lead to severe clinical manifestations in horses and other animals, posing a threat to human and companion animal health. In this study, we sequenced the complete genome of the SEZ strain HT321, a novel sequence type 420 isolated from a donkey with a respiratory infection in China. Subsequently, we conducted comparative genomics, core genome single nucleotide polymorphisms (cgSNP), phylogenetic analysis multi...
Influence of Cryopreservation on the Acrosome Reaction in Hucul Stallion Spermatozoa. The Hucul horse is a Polish primitive breed with a small population size, which highlights the importance of preserving the genetic resources. The cryopreservation of semen is essential for creating gene banks, but its effect on the acrosome reaction in Hucul stallions has not yet been investigated. The acrosome reaction is one of the most important physiological events associated with the fertilization process. Therefore, our goal was to determine the level of acrosome reaction in chilled and frozen/thawed Hucul stallion semen using the FluoAcro test and the SCA semen analysis system. We foun...
Heart Rate and Heart Rate Variability Are Affected by Age and Activity Level in Athletic Horses. The physiological capabilities of horses begin to decline after they reach 15 years of age. However, some exceptionally talented horses can continue their sports careers beyond this age, raising concerns about their welfare. This study investigated animal welfare by observing resting heart rate (HR) and heart rate variability (HRV) metrics in geriatric horses participating in similar training or physical activities compared to younger adult horses over 30 min periods. Forty-six horses of varying ages and activity levels were divided into four groups, including horses under 15 years practising ...
Meat Production Potential of Local Horse Breeds: Sustainable Conservation Through Valorization. Local horse breeds, particularly cold-blood types, are often marginalized in economic and social contexts, primarily due to the neglect of their economic, genetic, and cultural potential, as well as their role in preserving the identity of rural areas, local communities, and ecosystems. The valorization of these breeds is a crucial prerequisite for their economic repositioning. The Croatian Posavina horse is a local breed, well adapted to harsh, extensive production systems. Its sustainability is achieved through pasture-based meat production, primarily targeting foreign European markets. Ensu...
Transcriptional Factors Related to Cellular Kinetics, Apoptosis, and Tumorigenicity in Equine Adipose-Derived Mesenchymal Stem Cells (ASCs) Are Influenced by the Age of the Donors. The impact of donor age on Adipose-derived mesenchymal stem cell (ASC) functionality and safety remains insufficiently characterized, particularly in equine models. This study investigates the influence of age on ASCs proliferation dynamics and the expression of tumorigenic and apoptosis-related markers. Equine ASCs were isolated from juvenile (15 years) horses and assayed across multiple passages. The relative mRNA expressions of pluripotency (Oct4), tumorigenic (CA9), and apoptosis-related (Bax and Bcl 2) markers were evaluated. The Gompertz growth model, population doubling time (PDT), and ...
Impact of Low-Starch Dietary Modifications on Faecal Microbiota Composition and Gastric Disease Scores in Performance Horses. Equine gastric disease (EGD) is a common condition in performance horses (), potentially compromising behaviour, performance, and welfare. EGD is often attributed to high-starch, high-sugar feeds and limited forage. Evidence for diet-induced changes on digestive microbiota is lacking. Nine elite showjumping horses were housed at the same performance yard with standardised diet and management throughout the study. Horses were transitioned from a high-sugar and -starch (31%) feed to a low-starch and -sugar (16.5%) concentrate feed. Gastroscopies, blood, and faecal samples were taken pre- and 12 ...
First report of Trypanosoma evansi A-type from the Ecuadorian Amazon: Phylogenetic and structural analyses of the VSG RoTat1.2 fragment. Trypanosoma evansi, a protozoan parasite of the Trypanozoon subgenus, infects domestic and wild animals, and occasionally humans, worldwide. Despite its significant impact on livestock production, epidemiological studies and molecular analyses of T. evansi based on variant surface glycoproteins (VSG) remain limited in South America. We report the first molecular identification of T. evansi in two localities in the Ecuadorian Amazon and provide phylogenetic and structural analyses of the VSG RoTat 1.2 fragment. Using a retrospective biobank approach, we analyzed DNA from blood samples of dogs a...
Influence of lighting on sleep behaviour, circadian rhythm and spontaneous blink rate in stabled riding school horses (Equus caballus). Modern horse husbandry involves significant time spent indoors, often in suboptimal lighting conditions and with frequent night-time disturbances by humans for management purposes. The aim of this study was to investigate the influence of a customised light-emitting diode (LED) lighting system and a standard fluorescent lighting fixture on equine sleep behaviours, circadian rhythmicity and spontaneous blink rates in horses. Ten riding school horses experienced two stable lighting conditions for four weeks each in a cross-over study running from January to March, 2023. The treatment lighting co...
Pharmacokinetics of cannabidiol and its two main phase I metabolites in Connemara ponies. Cannabidiol (CBD) has shown potential therapeutic benefits in veterinary medicine, but further investigations are needed to establish its pharmacokinetics and therapeutic dosing in horses and ponies. The present study aimed to investigate the pharmacokinetic properties of CBD in Connemara ponies following oral administration of CBD oil. Unassigned: Ten healthy ponies received a single oral dose of CBD oil at 2 mg/kg. Blood samples were collected before dosing and up to 16 days post-administration, with physical examinations conducted at baseline and at 8, 12, and 24 h post-dose. Addition...
Mosaic arthroplasty in equine stifle and fetlock joints: A retrospective study of 31 cases between 1998 and 2023. To evaluate the clinical application of equine mosaic arthroplasty for joint surface repair, including outcomes and complications. Methods: Retrospective clinical study. Methods: A total of 31 horses diagnosed with subchondral bone cysts (SBCs) in the femoral condyle (22/31), distal metacarpus (7/31), or metatarsus (2/31). Methods: Medical records of horses that underwent autologous or allogeneic osteochondral graft transplantation were reviewed. Follow-up lasted at least 12 months. Success was determined in terms of improvements in lameness and post-surgical athletic performance, classified...
Using STR Data to Investigate the Impact of the Studbook Cap on Genetic Diversity in the American Standardbred Horse from 1998 to 2021. Standardbreds, a breed of horses used in harness racing at either the trot or the pace, established a closed studbook in 1973. Concerns about genetic diversity within the breed led the United States Trotting Association (USTA) to establish a limit of mares bred per stallion (i.e., a studbook cap) in 2009. Here, we aimed to evaluate the impact of the breeding restrictions on genetic diversity between and among subpopulations. : Sixteen short tandem repeats (STRs) were analyzed across a dataset of 176,424 Standardbreds foaled in the United States between 1998 and 2021. We examined allelic richn...
Detection of Novel Orthobunyavirus Reassortants in Fatal Neurologic Case in Horse and Culicoides Biting Midges, South Africa. We detected Shuni virus in horses and ovine fetuses and Shamonda virus in a caprine fetus in South Africa. We identified a Shuni/Shamonda virus reassortant in a horse and Shuni/Caimito, Shamonda/Caimito, and Shamonda/Sango virus reassortants in Culicoides midges. Continued genomic surveillance will be needed to detect orthobunyavirus infections in Africa.
Dietary nonstructural carbohydrates influence synthesis of mare milk carbohydrates and yield. Mare milk is the primary source of nutrients for neonatal foals and contains various carbohydrates. Milk oligosaccharides are complex carbohydrates that are resistant to enzymatic digestion and provide support for the immune system and developing microbiome in the neonate. However, factors influencing the synthesis of milk carbohydrates in the mare are not well understood. This study aimed to determine the effects of dietary nonstructural carbohydrate (NSC) on mare milk composition and yield. Thoroughbred mares were paired by age and last breeding date then randomly assigned to one of two diet...
Spinal Injuries from Equestrian Activity: A US Nationwide Study. Equestrian activities can result in spine injuries. Most studies are from single centers, and none use a national database. It was the purpose of this study to describe the demographics, injury mechanisms, and types of equestrian-associated spinal injuries using a US national ED database. The National Electronic Injury Surveillance System database was queried for equestrian-related spine injuries from 2000-2023. ED disposition was categorized as discharged or not discharged. Statistical analyses accounted for the weighted, stratified nature of the data to obtain national estimates. There we...
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