Veterinary Practice Research Articles

An Illustrated Scoping Review of the Magnetic Resonance Imaging Characteristics of Canine and Feline Brain Tumors.

Magnetic resonance imaging (MRI) is used pervasively in veterinary practice for the antemortem diagnosis of intracranial tumors. Here, we provide an illustrated summary of the published MRI features of primary and secondary intracranial tumors of dogs and cats, following PRISMA scoping review guidelines. The PubMed and Web of Science databases were searched for relevant records, and input from stakeholders was solicited to select data for extraction. Sixty-seven studies of moderate to low-level evidence quality describing the MRI features of pathologically confirmed canine and feline brain tumors met inclusion criteria. Considerable variability in data inclusion and reporting, as well as low case numbers, prohibited comparative data analyses. Available data support a holistic MRI approach incorporating lesion number, location within the brain, shape, intrinsic signal appearances on multiparametric sequences, patterns of contrast enhancement, and associated secondary changes in the brain to prioritize differential imaging diagnoses, and often allows for accurate presumptive diagnosis of common intracranial tumors. Quantitative MRI techniques show promise for improving discrimination of neoplastic from non-neoplastic brain lesions, as well as differentiating brain tumor types and grades, but sample size limitations will likely remain a significant practical obstacle to the design of robustly powered radiomic studies. For many brain tumor variants, particularly in cats, there remains a need for standardized studies that correlate clinicopathologic and neuroimaging data.

Effectiveness of modern antiparasitic animal collars

Despite the successes achieved in the prevention and control of parasitic diseases in companion animals, the issue of developing and implementing innovative, highly effective antiparasitic agents in veterinary practice is still relevant today. This study aimed to evaluate the efficacy of modern antiparasitic collars for dogs and cats in the prevention and treatment of ectoparasitic infections. The antiparasitic agents used in the experiments were ‘Flea and tick collar Comfort for cats’, ‘Antiparasitic collar TM Healthy Pet, Oberig’, ‘Flea and tick collar Comfort for dogs’, and ‘Antiparasitic collar TM Compliment, Oberig’. The active ingredient in the collars tested is diazinon. The experimental studies were conducted under current methodological recommendations and practical guidelines. The study of shelter pets and stray animals revealed their infestation with lice, fleas, and parasitic ticks of varying intensity. Experimentally, a high insecticidal effect of the products ‘Flea and tick collar Comfort for cats’ and ‘Antiparasitic collar TM Healthy Pet, Oberig’ was established, ‘Flea and tick collar Comfort for dogs’, ‘Antiparasitic collar TM Compliment, Oberig’ against fleas (Ctenocephalides felis, Ctenocephalides canis), chewing lice (Felicola subrostratus), sucking lice (Linognathus setosus), ticks (Ixodes ricinus, Dermacentor spp., Rhipicephalus spp.) The effectiveness of the drugs is 100%. It has been experimentally proven that the studied collars with the active ingredient diazinon can be used for preventive and therapeutic purposes for companion animals in case of infestation with fleas, chewing lice, sucking lice, and ticks

APPLICATION OF VETERINARY ETHICS IN INDONESIA

This article was written to find out the application of veterinary ethics in the work environment in Indonesia. The method used is the method of literature. In Indonesia, the Indonesian Veterinary Association (PDHI) has agreed that what is used as a guideline is the Indonesian Veterinary Professional Code of Ethics. This code of ethics provides guidelines for veterinarians in carrying out their practice according to professional and moral standards. The application of veterinary ethics in veterinary practice in Indonesia involves various aspects that need attention, namely animal welfare, transparency and communication, independence and avoiding conflict, and professional development and continuing education. The challenges faced by veterinarians include malpractice, violations of the code of ethics, zoonotic disease issues, limited facilities and infrastructure, and the obligation to always maintain the good name of veterinarians as a noble profession. The application of veterinary ethics is a strong foundation in the professional development of veterinarians in Indonesia. While some barriers may be encountered, continued efforts to improve education, access to resources, and support from relevant institutions and stakeholders can help overcome these obstacles. In addition, Indonesian veterinarians must not only improve their hard skills, but also improve their soft skills, in order to become successful and moral veterinarians.

In vitro immunotoxicity effects of carbendazim were inhibited by n-acetylcysteine in microglial BV-2 cells

Carbendazim (CBZ) is a benzimidazole fungicide widely used worldwide in industrial, agricultural, and veterinary practices. Although, CBZ was found in all brain tissues causing serious neurotoxicity, its impact on brain immune cells remain scarcely understood. Our study investigated the in vitro effects of CBZ on activated microglial BV-2 cells. Lipopolysaccharide (LPS)-stimulated BV-2 cells were exposed to increasing concentrations of CBZ and cytokine release was measured by ELISA, and Cytometric Bead Array (CBA) assays. Mitochondrial superoxide anion (O2·-) generation was evaluated by Dihydroethidium (DHE) and nitric oxide (NO) was assessed by Griess reagent. Lipid peroxidation was evaluated by measuring the malonaldehyde (MDA) levels. The transmembrane mitochondrial potential (ΔΨm) was detected by cytometry analysis with dihexyloxacarbocyanine iodide (DiOC6(3)) assay. CBZ concentration-dependently increased IL-1β, IL-6, TNF-α and MCP-1 by LPS-activated BV-2 cells. CBZ significantly promoted oxidative stress by increasing NO, O2·- generation, and MDA levels. In contrast, CBZ significantly decreased ΔΨm. Pre-treatment of BV-2 cells with N-acetylcysteine (NAC) reversed all the above mentioned immunotoxic parameters, suggesting a potential protective role of NAC against CBZ-induced immunotoxicity via its antioxidant and anti-inflammatory effects on activated BV-2 cells. Therefore, microglial proinflammatory over-activation by CBZ may be a potential mechanism by which CBZ could induce neurotoxicity and neurodegenerative disorders.

Ultrasonographic Assessment of Liver Size and its Association to Selected Morphometric Parameters of Domestic Dogs in Accra, Ghana

Introduction: The global unpopularity of linear ultrasonographic measurement, due to its inherent subjectivity, contrasts with the safety, portability, low cost, and real-time capabilities of this imaging modality. The increased availability of ultrasounds in veterinary practice in Ghana presents an opportunity to provide ultrasonographic liver size reference ranges to aid the diagnosis of hepatopathies in domestic dogs. Therefore, this study sought to establish ultrasonographic liver size reference ranges of dogs in Accra, Ghana. It also aimed to to investigate the correlation between liver size and selected morphometric parameters in these domestic dogs. Materials and methods: A total of 60 dogs from different domestic breeds, sexes (27 males and 33 females), age ranges (2.82 ± 2.12 years), weights (28.83 ±9.98kg), and body conformation were sampled. Purposive sampling of dogs was performed based on presenting history, clinical signs, physical exam, and blood analysis. Blood samples were collected for serum biochemistry to distinguish between those classified as healthy and those presenting with clinical illness. Additionally, all dogs were subjected to linear ultrasonographic liver size measurements in longitudinal and transverse planes. Results: The findings indicated a strong positive correlation of mean longitudinal sonographic liver measurement with body height, body girth (the widest point of the chest and the rib cage), the distance between the last rib and the tuber coxa, and the distance between the xiphoid and the tuber ischium. Equations were derived from the mean longitudinal sonographic measurement and these body parameters for deep and non-deep-chested breeds. This study helped to establish equations that can be used to estimate the longitudinal liver measurement. Conclusion: This information can be used in clinical settings to help veterinarians (even with basic knowledge of hepatic ultrasonography) to have a fair idea of hepatopathies relating to size.

Animal Health Discourse during Ecological Crises in the Media-Lessons Learnt from the Flood in Thessaly from the One Health Perspective.

Due to the increasing risk of extreme events caused by climate change (i.e., floods, fires and hurricanes) or wars, European veterinary public health may need some improvement. Utilizing a mix of qualitative (participatory observation) and quantitative methods (Internet mining), we analyzed the Greek media's responses to the millennial flood in Thessaly (September 2023), focusing on animal health (including wild, companion animals and livestock) and public sentiment towards epizootic/epidemic threats. The study revealed a gap in crisis management plans regarding veterinary-related issues, emphasizing the need for comprehensive emergency response strategies. Our findings show how (i) the lay referral system is projecting the perception of epidemic threats into the population; (ii) the emotional load of images of animal carcasses is misused by media creators aiming for a big audience; and (iii) pets' owners are creating online communities for the searching and treatment of their pets. Our results stress the importance of integrating crisis communication in consecutive phases of the discourse, such as the following: (i) weather change; (ii) acute flood; (iii) recovery; and (iv) outbreaks, into veterinary practices to better prepare for such disasters.

A comparison between veterinary small animal general practitioners and emergency practitioners in Australia. Part 1: demographic and work-related factors.

Occupational stressors are commonly encountered in small animal veterinary practice and have been associated with burnout. The working context of veterinarians differs by specialty, and this can potentially lead to variable exposures to risk factors for burnout. The aim of this study was to explore differences in demographic and working conditions of veterinary general practitioners (GPs) and emergency practitioners (EPs) to compare exposure to different potential stressors. An anonymous, online survey was administered to veterinary GPs and EPs practicing in metropolitan regions of Australia. In total, 320 participant responses were analyzed (n = 237, 74.2% GPs and n = 83, 25.9% EPs). Significant differences (P < 0.05) in the demographics and work-related exposures were found between the two groups. GPs were found to be older than EPs with a greater number of years of experience in their field (P < 0.001). Most veterinary GPs worked only day shifts (207/236, 87.7%); where EPs worked a greater variety of shift patterns, with "only day shifts" being the least common shift pattern (P < 0.001). Most GPs worked a set and predictable roster pattern (195/236, 83.6%), while most EPs did not (51/83, 61.5%). EPs worked more weekends and public holidays (P < 0.001). The EP group performed more hours of work each week but worked less overtime. The main contributing factors for overtime were scheduling factors for GPs and staffing issues for EPs. EPs were commonly not able to take meal-breaks and GPs' meal-breaks were commonly interrupted by work. EPs were more frequently exposed to patient death, euthanasia (including for financial reasons), emotionally distressed clients and delivering negative news (P < 0.001). Both groups indicated that most work environments were collegiate and supportive, and a minority reported toxic colleagues (11.8%) or management teams (26.9%). Just under one-half of respondents reported having witnessed or experienced workplace bullying. Of our respondent group, 52.0% (166/319) were not satisfied with their remuneration. Desire to leave their principal area of practice was prevalent among this survey group (192/319, 60.2%) with approximately one-third considering leaving the veterinary profession. We discuss the implications of these workplace factors, including mitigation strategies.

THE FEATURES OF THE STRUCTURE OF THE LYMPHOID COMPONENT OF RAT PERICARDIUM THROUGHOUT ONTOGENESIS.

Introduction. Research of the cardiovascular system is a relevant issue today, because its diseases are highly pathological and significantly affect the general mortality of the population. The morphofunctional state of the heart directly depends on the pericardium, which, in turn, performs a number of key physiological functions for the heart. The pericardium, having a coelomic origin, can perform not only a mechanical barrier function, but also exhibits immune properties through lymphoid tissue associated with serous membranes, known as serosa-associated lymphoid clusters. Objective. The purpose of the study is to expand the understanding of the structure of the lymphoid component of the pericardium, to analyze the qualitative composition of this tissue, and to study the topography at various stages of the postnatal ontogenesis of rats. Materials and methods. The study was conducted on 4 age groups of laboratory rats, each of which included 5 individuals. Film preparations were made. Samples of film preparations were stained with methylene blue, as well as with hematoxylin and eosin natively and after fixation. Results. The lymphoid tissue of the pericardium of rats is mainly represented by small and medium-sized lymphocytes, as well as cells that are similar to plasma cells. Features of the topography of the lymphoid tissue of the pericardium in the early and late postnatal periods, revealed with the help of various staining methods, testify to important aspects of the morphology of the rat pericardium. Conclusions. Analysis of the lymphoid population of cells made it possible to determine them in different parts of the organ during ontogenesis, indicating the presence of dynamic changes in the lymphoid tissue of the pericardium during the postnatal period. Taking into account the age-related features of the structure of the pericardium, further study of the qualitative and quantitative composition of serosa-associated lymphoid clusters in rats is recommended, which allows for a more detailed understanding of the immune processes that occur in this organ. Considering the importance of immunological aspects of the cardiovascular system, the obtained data have a high potential for application in veterinary and medical practice.

Application of modified porcine xenograft by collagen coating in the veterinary field: pre-clinical and clinical evaluations.

This study aimed to identify a collagen-coating method that does not affect the physicochemical properties of bone graft material. Based on this, we developed a collagen-coated porcine xenograft and applied it to dogs to validate its effectiveness. Xenografts and collagen were derived from porcine, and the collagen coating was performed through N-ethyl-N'-(3- (dimethylamino)propyl) carbodiimide/N-hydroxysuccinimide (EDC/NHS) activation. The physicochemical characteristics of the developed bone graft material were verified through field emission scanning electron microscope (FE-SEM), brunauer emmett teller (BET), attenuated total reflectance-fourier transform infrared (ATR-FTIR), and water absorption test. Subsequently, the biocompatibility and bone healing effects were assessed using a rat calvarial defect model. The physicochemical test results confirmed that collagen coating increased bone graft materials' surface roughness and fluid absorption but did not affect their porous structure. In vivo evaluations revealed that collagen coating had no adverse impact on the bone healing effect of bone graft materials. After confirming the biocompatibility and effectiveness, we applied the bone graft materials in two orthopedic cases and one dental case. Notably, successful fracture healing was observed in both orthopedic cases. In the dental case, successful bone regeneration was achieved without any loss of alveolar bone. This study demonstrated that porcine bone graft material promotes bone healing in dogs with its hemostatic and cohesive effects resulting from the collagen coating. Bone graft materials with enhanced biocompatibility through collagen coating are expected to be widely used in veterinary clinical practice.

Clinical validation of circulating immune complexes for use as a diagnostic marker of canine leishmaniosis.

Canine leishmaniosis (CanL) is a systemic disease that affects dogs. When multiplication of the parasite cannot be controlled, dogs consistently show high levels of antigen and IgG antibodies, which lead to the formation of circulating immune complexes (CIC). Timely intervention to reduce the parasite load and CIC levels is crucial for preventing irreversible organ damage. However, a diagnostic test to quantify CIC levels is currently lacking. In this real-world study, we aimed to examine the performance of a new ELISA to measure CIC levels in dogs naturally infected with Leishmania infantum. Thirty-four dogs were treated according to their clinical condition and followed for 360 days. Before (day 0) and after treatment (days 30, 90, 180, 270, and 360), all dogs underwent a physical examination, and blood samples were obtained for CBC, biochemical profile, serum protein electrophoresis and IFAT. Serum PEG-precipitated CIC were determined by ELISA. Our results indicate higher CIC levels in dogs in advanced disease stages showing higher antibody titres (p < 0.0001, r = 0.735), anemia (p < 0.0001), dysproteinemia (p < 0.0001), and proteinuria (p = 0.004). Importantly, dogs responding well to treatment exhibited declining CIC levels (p < 0.0001), while in poor responders and those experiencing relapses, CIC were consistently elevated. CIC emerged as a robust discriminator of relapse, with an area under the curve (AUC) of 0.808. The optimal cut-off to accurately identify relapse was an optical density of 1.539. Our findings suggest that declining CIC levels should be expected in dogs showing a favorable treatment response. Conversely, in dogs displaying a poor response and recurrent clinical relapses, CIC levels will be high, emphasizing the need for vigilant monitoring. These findings suggest that CIC could serve as a valuable biomarker for disease progression, treatment efficacy, and relapse detection in CanL. Our study contributes to enhancing diagnostic approaches for CanL and underscores the potential of CIC as a complementary tool in veterinary practice. As we move forward, larger studies will be essential to confirm these findings and establish definitive cut-offs for clinical application.

Challenges and mitigation strategies associated with Burkholderia cepacia complex contamination in pharmaceutical manufacturing.

Burkholderia cepacia complex (BCC) is a Gram-negative, non-spore-forming bacterium with more than 20 opportunistic pathogenic species, most commonly found in soil and water. Due to their rapid mutation rates, these organisms are adaptable and possess high genomic plasticity. BCC can cause life-threatening infections in immunocompromised individuals, such as those with cystic fibrosis, chronic granulomatous disease, and neonates. BCC contamination is a significant concern in pharmaceutical manufacturing, frequently causing non-sterile product recalls. BCC has been found in purified water, cosmetics, household items, and even ultrasound gel used in veterinary practices. Pharmaceuticals, personal care products, and cleaning solutions have been implicated in numerous outbreaks worldwide, highlighting the risks associated with intrinsic manufacturing site contamination. Regulatory compliance, product safety, and human health protection depend on testing for BCC in pharmaceutical manufacturing. Identification challenges exist, with BCC often misidentified as other bacteria like non-lactose fermenting Escherichia coli or Pseudomonas spp., particularly in developing countries where reporting BCC in pharmaceuticals remains limited. This review comprehensively aims to address the organisms causing BCC contamination, genetic diversity, identification challenges, regulatory requirements, and mitigation strategies. Recommendations are proposed to aid pharmaceutical chemists in managing BCC-associated risks and implementing prevention strategies within manufacturing processes.

Antibiotic use in the Northern Irish sheep flock: What lessons can be learnt from medicine records and farmer attitudes to improve stewardship of these essential medicines?

Stewardship of antibiotics used in livestock production has come under increasing scrutiny, from both the animal welfare point of view and due to concerns that antibiotic use in livestock may pose a risk to human health through selection pressure to drive development of antibiotic resistant strains of bacteria. Despite this concern, however, antibiotic consumption in the sheep sector is currently poorly described. This study determines the range and quantities of antibiotics used in the Northern Irish (NI) sheep flock as well as exploring drivers for their use. A mixed-methods approach was utilised, with an anonymous online scoping survey, analysis of the medicine records from 52 NI sheep farms and semi-structured interviews undertaken with 27 farmers. Eighteen farmers contributed both records and participated in interviews. Veterinary medicine records were derived from two sources: on-farm medicine books (seven) or veterinary practice sales data (51). As six of these farmers provided information from both sources a total of 52 unique farms participated. Overall, antibiotic use in sheep on the 52 farms sampled was low, with a median value of 11.35 mgPCU−1 (mean 13.63 mgPCU−1, sd 10.7; range 0–45.29 mgPCU−1), with all farms below 50 mgkg−1. Critically important antibiotics accounted for 0.21% of all antibiotics purchased. Lameness was the main driver of antibiotic use identified by this study. Others included a range of prophylactic treatments such as oral antibiotics to prevent watery mouth, injectable antibiotics to prevent abortion and following assisted lambing. Farmers acknowledged some of these uses had become habitual over time. The veterinary medicine sales records demonstrated significant sales of antibiotics not authorised for use in sheep, on an ongoing, rather than case-by-case, basis. Farmers were positive about their veterinarian’s ability and knowledge to improve flock welfare and productivity, but were unwilling to pay for this advice. However, veterinarians may have facilitated weak medicine stewardship through a failure to adequately challenge farmers seeking antibiotics. Farmers did not maintain accurate or up-to-date on farm medicine or production records in the majority of cases. Despite this lack of on-farm recording, veterinary sales records can be studied in consultation with farmers to provide veterinarians with a farm-specific insight into antibiotic use and related attitudes and behaviours. Farmers and veterinarians can then identify areas and behaviours to target collaboratively, improving antibiotic and wider medicine stewardship, whilst simultaneously improving flock health and productivity.

A Cadaveric Study Using Anatomical Cross-Section and Computed Tomography for the Coelomic Cavity in Juvenile Cory's Shearwater (Aves, Procellariidae, Calonectris borealis).

Birds play a crucial role in ecosystems, engaging in key functions such as pollination, pest control, and seed dispersal. The anatomical understanding of these species is essential to addressing emerging challenges, including climate change and habitat loss, which directly impact their survival. Detailed knowledge of avian anatomy is fundamental for research across various disciplines, ranging from ornithology to veterinary medicine. Therefore, this study aims to disseminate the understanding of avian anatomy and the application of computed tomography (CT) for visualizing the coelomic cavity in Cory's Shearwater (Calonectris borealis). Recent advances in comprehending the anatomical structures of this region in avian species are highlighted, with a specific focus on Cory's Shearwater as a study model. Various anatomical cross-sections and transverse CT images were described and analyzed in detail, offering a comprehensive insight into the coelomic cavity from different perspectives. The correlation between anatomical cross-sections and CT images is emphasized as crucial for a profound understanding of avian anatomy. This research contributes to the broader knowledge of avian anatomy, with potential implications for conservation efforts and veterinary practices.

Wings of Knowledge: Navigating Learner Confidence and Cognitive Load in Avian Radiography with a Low Fidelity Model

In veterinary first opinion practice, radiography is an important diagnostic tool for avian patients. Teaching of such diagnostic skills to learners is usually conducted using teaching models in clinical skills laboratories. The aim of this work is to evaluate the impact of using a teaching model for avian radiography positioning by measuring learner's cognitive load, confidence, satisfaction, and assessing learning by OSCE assessment. An avian radiography positioning model was created and evaluated with pre- and post-Likert questions on confidence, a pre and post 9-point cognitive load scale, an OSCE assessment (max score = 20), and post Likert questions on satisfaction. Thirty-two undergraduate veterinary medicine and veterinary nursing students participated in the study. The results showed the cognitive load of participants was high and did not change with the use of a physical model ( p = .882). Participants exhibited increased confidence in avian radiography positioning (pre; M = 2, post; M = 4, p &lt; .001) and expressed high overall satisfaction with the model (x̄ = 4.6, no negative or neutral Likert responses). The OSCE results demonstrated a higher pass rate mean (82%) for the positioning tasks compared to the collimation and centering tasks (53%). Overall, the model was well received by learners with increased confidence and a satisfactory learning experience in a clinical skill for exotics species. These findings suggest the avian radiography positioning model is an effective model to train students to position avian patients for radiography.

Data Analyses in Veterinary Research and Practice

Data Analyses in Veterinary Research and Practice

Observational Studies in Veterinary Research and Practice

Observational Studies in Veterinary Research and Practice

Contribution of the veterinary profession to the Australian animal health surveillance system and opportunities for future contributions

Animal health surveillance is crucial for early detection of emergency animal diseases and effective responses. However, surveillance systems are complex and rely on the contributions of many animal health stakeholders. Veterinarians are key stakeholders in this system, given their role and skills in investigating, diagnosing, and reporting notifiable diseases. This study investigated the contribution of the veterinary workforce to the Australian animal health surveillance system and opportunities for future involvement. To achieve the aims of the study, an online cross-sectional survey among the veterinary profession was conducted. Descriptive statistics and regression analyses were used to provide an overview and investigate drivers of attitudes and practices of veterinarians in relation to animal health surveillance. A total of 311 usable responses were obtained, with 191 being from veterinarians who worked in private practice in the previous 12 months. Among private practitioners, 58.6% worked with companion animals, 34.0% were mixed practice veterinarians and 7.3% were equine veterinarians. Over half (56.6%) of all participants considered themselves active participants in the local animal disease management system. The level of confidence in understanding the reporting system and knowing and identifying signs of endemic and exotic diseases was moderate among those working in private practice, with companion animal veterinarians reporting the lowest levels of confidence (p < 0.05). Approximately 40% of veterinarians had taken samples for diagnosis for notifiable diseases in the last year, with just over 20% reporting a notifiable disease. Awareness of and participation in training and surveillance programs for animal diseases by veterinarians was low, with those working in private practice having lower levels of both awareness and participation for most programs. In relation to potential future contribution to the surveillance system, over half of participants reported being interested and available to undertake surveillance work on behalf of the government, with those in mixed practice reporting higher levels of interest (69.6%) compared to those in companion (49.5%) and equine practice (30.8%). However, key challenges identified were related to perceived conflict of interest, and tensions between client needs and government agenda, followed by profitability and suitability of the business. This study provides evidence of a significant existing contribution by the veterinary profession to the surveillance system, and the capacity and willingness to increase this contribution. However, there are gaps in awareness, confidence and participation, as well as financial and veterinary-client relationship challenges that should be considered in any future planning to strengthen the Australian surveillance system.

Rapid hearing threshold assessment with modified auditory brainstem response protocols in dogs.

Auditory brainstem response (ABR) is the gold standard for hearing testing in dogs. ABR is commonly used in puppies to diagnose congenital sensorineural deafness. Long test times limit the use for a more comprehensive hearing screening in veterinary practice. This study aimed to establish a super-fast hearing screening protocol in dogs. Hearing thresholds were routinely measured with a mobile device designed for newborn hearing screening in 90 dogs. We introduced modifications of the ABR protocol, e. g., a binaural test mode, higher stimulus rates, a broadband chirp stimulus, and an algorithm for automatic peak V detection in a stepwise fashion. Hearing thresholds were then measured with fast protocols utilizing either 30 Hz click or 90 Hz broadband chirp stimuli with 80, 60, 40, 30, 20, 10, 0 and -10 dBnHL stimulation intensities. Interrater reliability, agreement between click and chirp hearing thresholds and correlations with clinical characteristics of the dogs were assessed. Using all innovations, the test time for hearing threshold assessment in both ears was reduced to 1.11 min (mean). The chirp stimulus accentuated both, peak V and the subsequent trough, which are essential features for judgement of the hearing threshold, but preceding peaks were less conspicuous. Interrater reliability and agreement between click and chirp hearing threshold was excellent. Dogs >10 years of age and dogs with abnormal hearing score or otitis score had significantly higher hearing thresholds than younger dogs (p ≤ 0.001) or dogs without abnormalities (p < 0.001). The results demonstrate that modifications in ABR protocols speed-up test times significantly while the quality of the recordings for hearing threshold assessment is maintained. Modified ABR protocols enable super-fast hearing threshold assessment in veterinary practice.

The prevalence of damaged tails in New Zealand dairy cattle

ABSTRACT Aims: To undertake a survey of the prevalence of tail deviations, trauma and shortening on a representative selection of New Zealand dairy farms, and to assess whether sampling based on milking order could be used instead of random sampling across the herd to estimate prevalence. Methods: This was a cross-sectional observational study, with 200 randomly selected farms enrolled across nine regions of New Zealand via selected veterinary practices (one/region). Veterinary clinics enrolled 20–25 farms each depending on region, with 1–2 trained technicians scoring per region. All cows (n = 92,348) present at a milking or pregnancy testing event were tail scored using a modified version of the New Zealand Veterinary Association Industry Scoring System. Palpated lesions were recorded as deviated (i.e. non-linear deformity), shortened (tail shorter than normal) or traumatic (all other lesions). The location of lesions was defined by dividing the tail into three equal zones: upper, middle and lower. A cow could have more than one lesion type and location, and/or multiple lesions of the same type, but for the prevalence calculation, only the presence or absence of a particular lesion was assessed. Prevalence of tail damage calculated using whole herd scoring was compared to random sampling across the herd and sampling from the front and back of the milking order. Bootstrap sampling with replacement was used to generate the sampling distributions across seven sample sizes ranging from 40–435 cows. Results: When scoring all cows, the median prevalence for deviation was 9.5 (min 0.9, max 40.3)%; trauma 0.9 (min 0, max 10.7)%, and shortening was 4.5 (min 1.3, max 10.8)%. Deviation and trauma prevalence varied between regions; the median prevalence of deviations ranged from 6% in the West Coast to 13% in Waikato, and the median prevalence of all tail damage from 7% in the West Coast to 29% in Southland. Sampling based on milking order was less precise than random sampling across the herd. With the latter and using 157 cows, 95% of prevalence estimates were within 5% of the whole herd estimate, but sampling based on milking order needed > 300 cows to achieve the same precision. Conclusions and clinical relevance: The proportion of cows identified as having damaged tails was consistent with recent reports from New Zealand and Ireland, but at 11.5%, the proportion of cows with trauma or deviation is below acceptable standards. An industry-wide programme is needed to reduce the proportion of affected cows.

35 Louisiana cattle pregnancy determination clinic aims to improve reproductive efficiency

Abstract The Cattle Pregnancy Determination Clinic is a 1-d program aimed at teaching multiple methods of pregnancy determination to assist producers in effectively making keep/cull decisions and improving reproductive efficiency of their herd. This program began in 2019 after repeated requests for the inclusion of pregnancy determination techniques as a component of an annual Artificial Insemination School. Development of this program held one significant regulatory challenge. According to the Louisiana Veterinary Practice Act [La. R.S. 37:1511-1558], the use of any manual or mechanical procedure for pregnancy determination is considered to be a medical diagnosis. While producers do not have the right to diagnose the pregnancy status of other producers’ cattle, they can do so on their own cattle. To enforce these regulations, two essential components were integrated into the program: two local large animal veterinarians served as primary instructors, and each participant signs an acknowledgement form stating they understand the regulations within the Louisiana Veterinary Practice Act. Management practices are taught by blending classroom learning and hands-on practice. The classroom portion of the syllabus includes an introduction to female anatomy, explanations of how to determine pregnancy through rectal palpation and blood testing, and a brief overview of herd health and nutritional management. The outdoor portion affords participants the opportunity to rectally palpate open cows and cattle in all stages of pregnancy, collect blood via coccygeal venipuncture, and view ultrasound demonstrations. Ten clinics, two annually, have resulted in 123 participants completing the Cattle Pregnancy Determination Clinic. Space limitations restrict enrollment to 15 participants. At the conclusion of the program, participants were asked to complete an evaluation reviewing their experience, and an average completion rate of 94.25% was seen over the 5-yr period. When asked to rate overall impression of the clinic on a scale of 1 to 10 (1 = poor and 10 = great), 77.6% responded “10,” 21% responded “9,” 1% responded "8,” and less than 1% responded "7.” When asked to rate their likelihood of implementing pregnancy determination in their herd (1 = not likely and 10 = very likely), 83% responded “10,” 3.5% responded “9,” 5.5% responded "8,” and 8% responded "7.” When asked which portion of the program was most beneficial, a majority of responses were reflective of this selected comment, “The hands-on part only because it tied into the classroom part and made a better understanding.” The only responses on topics of no benefit included one regarding the nutrition portion, and one saying blood collection because they already had that knowledge. Inclusion of a chute-side pregnancy test demonstration and more information on herd health have been requested for future clinics. Participant feedback and continued requests for enrollment illustrate a demand for the continuation of this program.