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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 ...
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...
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...
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 ...
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...
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. Objective: 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...
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...
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...
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 ...
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 ...
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...
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 (<5 years), middle-aged (5-15 years), and geriatric (>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 Gomper...
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...
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...
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...
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...
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...
Tracheal collapse rates in Kenyan working cart and pack donkeys. Donkeys (Equus asinus) in East Africa are recognised as working with poorly designed harnesses and carts. The donkey cart used in regions of Africa, specifically Meru County, Kenya, appears to place the cart's weight solely on the donkey's mid-cervical region. The ventral area of the neck is vulnerable to external pressure on the trachea, which is superficially located. Objective: To compare the presence and severity of endoscopic abnormalities in the upper airway and trachea of Meru County working cart donkeys compared to pack donkeys. To determine associations between endoscopic and physical...
Measurements of equine foot parameters show limited agreement between radiographs and low-field magnetic resonance imaging. Equine foot radiographs are commonly obtained to measure anatomical conformation parameters. Comparison of measurements between radiographs and low-field magnetic resonance imaging (MRI) has not been extensively explored. Objective: To compare foot parameter measurements between radiographs and low-field MRI, and assess the effect of hoof wall markers on visualising the hoof capsule (during MRI) and facilitating measurements. Methods: Comparative cadaveric analytical study. Methods: Radiography and MRI of nine equine cadaver front feet were performed with and without hoof wall markers, which w...
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.
A comparison of the efficacy of three commercial human embryo vitrification kits for cryopreservation of in vivo produced equine embryos. Different cryoprotectants can influence the ability of embryos to successfully survive vitrification and subsequent warming before transfer. Objective: To compare pregnancy rates for embryos ≤500 μm vitrified, without puncture or aspiration of the blastocoele cavity, with one of three commercial human embryo vitrification kits containing the same penetrating cryoprotectants (DMSO and EG) but varying in their non-penetrating cryoprotectants (NPCPAs; sucrose, trehalose, dextran serum supplement [DSS], and hydroxypropyl cellulose [HPC]). Methods: In vivo experiments. Methods: Embryos (n =...
A comparison of a transdermal eutectic lidocaine/prilocaine cream and subcutaneous lidocaine injection prior to jugular vein catheterization in horses: a randomized crossover study. To compare horses' aversive behavioural responses to the application of 5% prilocaine/lidocaine eutectic mixture of local anaesthetics (EMLA) cream versus subcutaneous infiltration of 2% lidocaine, followed by jugular vein catheterization. Methods: Blinded, randomized study. Methods: A group of 26 university-owned research horses. Methods: Each horse received both treatments at opposite jugular sites with ≥ 12 hours between procedures. One randomly assigned jugular site received 1 g cm of 5% EMLA cream 60 minutes before catheterization, while the contralateral site received 1.5 mL of 2% lido...
Multisystemic Disease and Septicemia Caused by Presumptive Burkholderia pseudomallei in American Quarter Horse, Florida, USA. We report a presumptive case of melioidosis caused by an atypical Burkholderia pseudomallei serotype in an American quarter horse in north-central Florida, USA, through archived formalin-fixed paraffin-embedded specimens dating back to 2006. This case underscores the potential pathologic impact of emergent B. pseudomallei in the Gulf region of the United States.
Complications associated with subpalpebral lavage systems in upper and lower equine eyelids: A prospective, randomised study in 73 cases (2015-2024). Evidence for optimal location of subpalpebral lavage (SPL) systems is lacking. Objective: To compare the rate and types of complications with SPL systems located in central upper- compared with medial lower-eyelid in hospitalised patients. Methods: Prospective, randomised treatment trial. Methods: Horses admitted for ophthalmic treatment using an SPL system from February 2015 to January 2024 were included if ocular pathology did not necessitate SPL system placement in a specific location. Coin toss was used to determine location. SPL systems were monitored at least daily, and complications wer...
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...
Efficacy of needle and endoscopic lavage on the recuperation of microspheres from the adult equine metacarpo-/metatarsophalangeal joint and digital flexor tendon sheath. To measure microsphere recovery following needle-through-and-through lavage (NTAT) of the metacarpo-/metatarsophalangeal joint (fetlock) and digital flexor tendon sheath (DFTS) compared to endoscopic lavage (EL). Methods: Ex vivo experimental study. Methods: Adult equine cadavers immediately following euthanasia (n = 10). Methods: Colored 15 μm microspheres (2 million) were injected into fetlock joints and DFTS. Synovial structures were assigned to NTAT or EL groups. Each lavage was performed using 5 L of 0.9% NaCl, sequentially collecting egress fluid for microsphere quantification. Re...
Evaluation of use of respiratory physiotherapy in treatment of young foals with pneumonia. Pneumonia is a common condition in young, hospitalized foals, causing accumulation of inflammatory secretions to the airways. In humans, respiratory physiotherapy is commonly used as a supplementary treatment for pneumonia with varying results regarding its efficacy, but the efficacy in foals has not been assessed to date. Objective: This study aimed to evaluate the safety and efficacy of respiratory physiotherapy as a supplementary therapy method for young foals with pneumonia. Methods: A total of 44 foals with pneumonia aged under a month were used. The prospective intervention group receivi...
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