American journal of veterinary research最新文献

The US FDA's Center for Veterinary Medicine (CVM) is advancing its leadership in veterinary science by integrating AI and machine learning (ML) into its regulatory framework and scientific initiatives. This paper explores the CVM's strategic approach to harnessing these technologies to enhance human and animal health by supporting innovative products and methods. Key areas of focus include regulatory adaptation, genomic research, and information technology modernization. The Animal and Veterinary Innovation Agenda outlines the Center's commitment to fostering innovation in veterinary medicine while addressing emerging challenges. This includes developing AI/ML-driven tools for antimicrobial resistance research, genome editing safety, and postmarketing safety surveillance. The paper discusses the CVM's participation in the FDA's role in shaping guidance documents for AI in regulatory decision making. In genomic research, the CVM is utilizing AI/ML to study antimicrobial resistance and improve genomic editing techniques. These technologies enhance the understanding of resistance mechanisms and facilitate the precise identification of genetic alterations. Artificial intelligence is also pivotal in information technology modernization efforts, aimed at streamlining data management and enhancing operational efficiency. The paper highlights the efforts to integrate AI/ML in safety surveillance, including signal detection and case processing. It emphasizes the importance of human-led governance, data quality, and model validation in ensuring the ethical deployment of AI technologies. The CVM's initiatives represent a transformative shift toward more efficient and innovative regulatory approaches. The paper concludes with a call for continued collaboration among researchers, industry, and regulatory bodies to advance AI integration and achieve mutual goals in animal health.

Objective: This study investigated whether the behavior profiles of cats with inflammatory gastrointestinal or skin diseases differ from those of healthy cats.

Methods: We identified adult cats within the patient database at the University of Pennsylvania's veterinary hospital that had been diagnosed with inflammatory gastrointestinal (n = 22) or skin disorders (17) and a control group of healthy cats (58). We collected data via owner completion of the Feline Behavioral Assessment & Research Questionnaire from March to May 2023 and conducted an observational study comparing the Feline Behavioral Assessment & Research Questionnaire scores between groups.

Results: Cats with inflammatory gastrointestinal or skin disease exhibited more etepimeletic (care-soliciting) behaviors than healthy cats, including purring (U = 1,396.50, Z = 2.03, r = 0.21, 95% CI, 0.00 to 0.50), trainability (U = 1,303.50, Z = 2.33, r = 0.24, 95% CI, 0.00 to 1.00), and sociability to people (U = 367.50, Z = 2.21, r = 0.26, 95% CI, 0.00 to 1.57). The inflammatory group also exhibited more anxious behaviors than the healthy group, including compulsive grooming (U = 1,736.00, Z = 4.91, r = 0.50, 95% CI, 0.33 to 1.00) and fear of novelty (U = 603.00, Z = 2.14, r = 0.25, 95% CI, 0.00 to 1.00). Additionally, cats treated with corticosteroids exhibited more anxious behaviors than healthy and nonsteroid treatment groups, including separation behaviors (χ2[2] = 8.22, η2 = 0.08) and compulsive grooming (χ2[2] = 25.35, η2 = 0.25).

Conclusions: Chronic inflammatory response is associated with increased etepimeletic and anxious behaviors in cats, and corticosteroid treatment is associated with anxious behaviors.

Clinical relevance: These findings suggest that monitoring anxious and etepimeletic behaviors may be relevant when assessing inflammatory disease in cats.

Objective: To obtain standard reference values of intraocular pressure measured with rebound tonometry in conscious healthy Egyptian vultures (Neophron percnopterus).

Methods: 17 Egyptian vultures presented for a routine health check, involving a full physical examination, blood film examination, Hct, manual total leukocyte count, and plasma biochemistry. 15 animals considered healthy and with no signs of stress underwent an ophthalmic examination, including observation of facial symmetry, adnexa, and direct fundoscopy to screen for ocular disease. Healthy animals, with no evidence of ocular disease and no signs of stress, were included in the study. The birds were manually restraint in an upright position for rebound tonometry of the right and left eyes.

Results: Mean and SD of intraocular pressure were 27.33 ± 3.54 mm Hg for the right eye and 27.00 ± 4.11 mm Hg for the left eye. There was no statistical difference when comparing the right and left eyes. The combined mean ± SD for both eyes was 27.2 ± 3.76 mm Hg.

Conclusions: Rebound tonometry was well tolerated in all animals included in the study. The results of intraocular pressure with rebound tonometry can be used as reference values during the ophthalmological examination of Egyptian vultures.

Clinical relevance: The investigation of vision threatening diseases in Egyptian vultures may necessitate rebound tonometry as part of a comprehensive ophthalmologic examination. Rebound tonometry values obtained from anesthetized Egyptian vultures, or Egyptian vultures restrained in lateral, dorsal, or sternal positions, may differ from those reported here.

Objective: To determine the effect of the administration of oral gabapentin (20 mg/kg) and trazodone (8 mg/kg) on the MAC of isoflurane in dogs.

Methods: 6 adult dogs (3 castrated males and 3 spayed females), aged 13.3 ± 1.5 months and weighing 36.8 ± 3.4 kg (mean ± SD), were each anesthetized twice, separated by at least 7 days. Dogs were randomly assigned to receive gabapentin (20 mg/kg orally) and trazodone (8 mg/kg orally) followed by maintenance isoflurane or maintenance isoflurane alone. For their second event, dogs received the other treatment. The MAC was determined using an iterative bracketing technique with electric stimulation. Hemodynamic variables and vital parameters were assessed throughout the anesthetic episode. The effect of treatment on outcome variables was analyzed by use of a paired t test (P < .05).

Results: The mean ± SD MAC of isoflurane in dogs was significantly lower with gabapentin and trazodone premedication and isoflurane (0.625 ± 0.18%) compared with isoflurane alone (0.95 ± 0.14%). The mean MAC of isoflurane reduction was 0.33 ± 0.04%. Heart rate was decreased but still within normal limits in premedicated dogs. Other hemodynamic variables did not differ significantly between treatments.

Conclusions: Oral administration of gabapentin (20 mg/kg) and trazodone (8 mg/kg) 2 hours before anesthesia maintained with isoflurane had a MAC-sparing effect with no significant effect on hemodynamic variables in dogs.

Clinical relevance: Oral premedication with gabapentin and trazodone could be administered before anesthesia to decrease MAC, thus limiting dose-dependent anesthetic risks.

Objective: To assess the agreement of transpulmonary thermodilution (TPTD) and transpulmonary ultrasound dilution (TPUD) against direct measurement of main pulmonary artery flow with an ultrasound transit time flow probe (UTF) over a wide range of conditions in anesthetized cats. Additionally, the trending ability of TPTD, TPUD, and esophageal Doppler ultrasonography (EDU) was evaluated against UTF.

Methods: 12 purpose-bred cats were used. One cat was used for a pilot study. The cats were instrumented according to the manufacturer's recommendation. Paired measurements were made over a wide range of cardiac output. Agreement was analyzed with Bland-Altman analysis with repeated measures, and trending ability was assessed by 4-quadrant plot and concordance rate. Interchangeable was defined as percentage error less than simplified total error. Acceptable trending was defined as concordance rate > 95%.

Results: Bias and percentage error were -0.084 L·min-1 and 38.2% for TPTD and -0.041 L·min-1 and 52.9% for TPUD. The concordance rate was 100%, 95.5%, and 64% to 65% for TPTD, TPUD, and EDU, respectively.

Conclusions: Both TPTD and TPUD were not interchangeable to UTF. Both TPTD and TPUD provided acceptable trending ability but not EDU.

Clinical relevance: Transpulmonary thermodilution and TPUD allow detection of the direction of cardiac output changes in anesthetized cats but not EDU. Clinical and research use of these 3 devices warrants careful consideration of the limitations presented in this study.

Objective: To determine the predictive potential of the open reading frame 5 nucleotide sequence of porcine reproductive and respiratory syndrome (PRRS) virus and the basic demographic data on the severity of the impact on selected production parameters during clinical PRRS outbreaks in Ontario sow herds.

Methods: A retrospective longitudinal study of clinical outbreaks in Ontario sow herds at various points between September 5, 2009, and February 5, 2019, was conducted using herds as units of analysis. Data were gathered from study sow farms in Ontario at the start of each clinical outbreak. Six machine learning models and 2 different genetic input structures of open reading frame 5 sequences were utilized to predict the impact on abortion and preweaning mortality.

Results: Extreme boosting machine learning models with genetic data represented through 2-dimensional multiple correspondence analysis had the highest accuracy when predicting clinical outcomes (60.8% [SD = 12.4%] and 74.4% [SD = 13.2%]) for abortion and preweaning mortality outcomes, respectively. The mean sensitivity of classifying outbreaks with a high impact on abortion was 50%, with a specificity of 89.2%. The mean sensitivity of classifying outbreaks with high preweaning mortality was 56.2%, with a specificity of 85.2%.

Conclusions: The data and methods utilized herein exhibited improvement in accuracy over the baseline; however, this increase was not sufficient to warrant field implementation.

Clinical relevance: Predictive models based on observed data could assist practitioners in linking the genetics of the PRRS virus with clinical impact in clinical settings. Models trained in this study show promise for PRRS clinical impact prediction.

Objective: To understand the prevalence, genetic diversity, and potential pathogenicity of adenoviruses present in pigeon and turtledove populations.

Methods: Nested PCR and Sanger sequencing methods were used to identify the genotype and percentage of various adenoviruses in the feces of pigeon (Columba) and turtledove (Streptopelia) populations. In Beijing, China, a total of 194 fresh feces samples from meat-use pigeons (C livia domestica), homing pigeons (C livia domestica), wild pigeons (C livia domestica), and turtledoves (S decaocto and S chinensis) were collected using noninvasive sampling collection techniques. Their partial DNA-dependent DNA polymerase gene sequences were obtained using nested PCR and double-ended Sanger sequencing, and their genotypes were then ascertained based on sequence alignment.

Results: A total of 6 genotypes of adenovirus were detected in pigeon and turtledove flocks, including pigeon adenovirus (PiAdV)-1, PiAdV-2A, PiAdV-3, PiAdV-4, PiAdV-5, and a novel adenovirus genotype (PiAdV-6). Among them, PiAdV-1 was found widespread in flocks of pigeons exhibiting extensive presentations of hepatic necrosis. Highly conserved PiAdV-4 and PiAdV-5 were found to be nonpathogenic and extensively distributed in all pigeon and turtledove groups.

Conclusions: These findings imply the presence of diverse PiAdVs in pigeon and turtledove flocks, and the wild pigeons and wild turtledove birds are potentially serving as natural sources of these viruses.

Clinical relevance: This study provides supportive evidence of the pathogenicity of different genotypes of adenovirus in pigeon flocks and also implies that stopping the transmission of the virus brought by wild pigeons and turtledoves may be important for the prevention of diseases associated with PiAdVs.

Objective: To compare the pharmacokinetics of cannabidiol (CBD) and cannabidiolic acid (CBDA) in horses and to evaluate the safety of their chronic administration.

Methods: CBD- and CBDA-rich oil (1 mg/kg) were administered orally twice daily to 7 adult horses over 6 weeks in a randomized, crossover design with a 2-week washout period. A 12-hour pharmacokinetic analysis was conducted on day 1 of each 6-week trial, followed by the measurement of peak and trough concentrations at weeks 1, 2, 4, and 6. The cannabinoids safety was assessed via daily physical examination, periodic bloodwork, and liver biopsy at the beginning and end of the study.

Results: 12-hour pharmacokinetics revealed a higher maximum serum concentration (103 vs 12 ng/mL) and greater area under the curve (259 vs 62 ng·h/mL) for CBDA when compared to CBD. Cannabidiolic acid nadir and peak serum levels over time ranged from 46 to 122 ng/mL, which was higher than CBD (12 to 38 ng/mL). Complete blood count and serum chemistry revealed no clinically relevant changes with either CBD or CBDA. No significant abnormalities were detected on liver ultrasonographic and histopathologic evaluation on day 0 and after both phases of the study.

Conclusions: A dose of either 1 mg/kg of CBD or CBDA administered long term appears safe; however, CBDA serum concentrations suggest superior absorption/retention.

Clinical relevance: Chronic cannabinoid supplementation in horses is safe. Considering the higher absorption of CBDA, its use is recommended to evaluate the therapeutic efficacy of this common hemp derived cannabinoid.

Objective: In severe equine asthma, structural remodeling of the airways ultimately leads to bronchial wall thickening and airflow obstruction. Increased bronchial vascularization has been described in horses affected by the severe form of the disease, but whether it contributes to bronchial remodeling in milder forms of asthma remains to be determined. In a blinded, retrospective case-control study, we evaluated the presence of bronchial angiogenesis in horses with mild and moderate equine asthma (MEA) and its correlation to airway smooth muscle remodeling.

Methods: Endobronchial biopsies from the Equine Respiratory Tissue Biobank collected between August 14, 2014, and May 31, 2019, from 9 horses with MEA and 7 healthy controls were studied. The vascular basement membrane was identified by immunohistochemistry, allowing the measurement of the number of bronchial vessels, vascular area, and mean vessel size by histomorphometry. The correlations between angiogenic parameters, airway smooth muscle (ASM) remodeling features, and airway neutrophilia were studied.

Results: No differences between groups were observed for the angiogenic parameters evaluated. The number of vessels was correlated to ASM cell proliferation in MEA horses (Spearman r = 0.73) but not in controls. Airway neutrophilia correlated negatively with mean vessel size in horses with MEA (Pearson r = -0.83) but not in control horses.

Conclusions: Major changes in bronchial vascularization do not occur in central airways in MEA.

Clinical relevance: Contrary to previous findings in horses with severe equine asthma, angiogenesis is not a prominent feature of MEA, but it might be associated with ASM remodeling.