Changes over time in organic matter dynamics and copper solubility in a vineyard soil after incorporation of cover crop residues: Insights from a batch experiment.

Cover crops (CCs) are increasingly used in viticulture because they benefit the soil and the environment in many ways. This study investigated the extent to which the incorporation of CC residues altered organic matter (OM) and Cu dynamics in a Cu-contaminated vineyard topsoil. A 92-day incubation period was used to monitor changes over time in carbon mineralization, carbon hydrolytic enzyme activity, concentration and optical properties of dissolved organic matter (DOM), and Cu solubility after the addition (or not) of two CC residues, oat or faba bean. The results revealed that adding CCs transitorily increased the concentration of DOM in soil solution, as well as the activity of C hydrolytic enzymes and C mineralization rates. DOM content was approximately two orders of magnitude higher in CC-amended soils than in the control soil on day 0, after which it gradually decreased to reach concentrations similar to those measured in the control soil on day 92. Analyses of DOM optical properties showed that its molecular weight and degree of humification increased over time with a decrease in its concentration. The close relationship between DOM and Cu concentrations in the soil solution suggests that degradation of CCs releases soluble forms of C capable of complexing and solubilizing Cu, and hence that incorporating CC residues can transitorily increase the solubility of Cu in vineyard topsoils. Despite their different C:N ratios, oat and faba bean had almost the same effect on Cu dynamics, implying that C inputs played a prominent role in explaining the interactions between OM and Cu within the timeframe of our experiment. In conclusion, this study enabled recommendations on how to mitigate the risk of Cu ecotoxicity associated with incorporating CCs in Cu-contaminated vineyard soils.

Increased efficiency could lessen the need for more staff in companion animal practice.

OBJECTIVE: To evaluate technical efficiency of US companion animal practices. SAMPLE: 60 independently owned companion animal practices selected from the 2022 AVMA Veterinary Practice Owners Survey. PROCEDURES: A ratio of the weighted sum of outputs to weighted sum of inputs was computed for each practice (ie, decision-making unit [DMU]). Inputs included labor (hours worked) and capital (fixed costs and number of exam rooms). Outputs (or production) included annual gross revenue, number of patients seen per year, and number of appointment slots per full-time-equivalent (FTE) veterinarian per year. Data envelopment analysis was used to optimize the ratio and estimate relative efficiency (RE) scores. RESULTS: 25 (42%) practices were classified as having high efficiency (RE = 1 or 100% efficient), 26 (43%) as having moderate efficiency (RE > 0.7 but < 1.0), and 9 (15%) as having low efficiency (RE ≤ 0.7). Mean RE scores for moderate- and low-efficiency practices were 0.83 and 0.66, meaning they could have reached their current production levels with 17% or 34% less resources. Per the model, if all 60 practices were 100% efficient on the RE scale, 22 fewer FTE veterinarians, 47 fewer FTE veterinary technicians and assistants, and 43 fewer FTE nonmedical staff would be needed overall. CLINICAL RELEVANCE: These preliminary findings suggested that efforts to optimize efficiency could allow companion animal practices to meet demands for their services without necessarily needing to hire more staff. Such efforts might include engaging support staff to their full potential and implementing automated processes. Additional research is needed to identify routines or workflows that distinguish high-efficiency practices from others.

Benefits of practice ownership among US private practice veterinarians extend to professional quality of life.

Objective: To estimate the effects of practice ownership on wellbeing of US private practice veterinarians. Sample: 1,217 practice owners and 1,414 associate veterinarians (ie, nonowners) who participated in the 2021 AVMA Census of Veterinarians and Practice Owners Survey. Procedures: A professional quality of life instrument was used to measure compassion satisfaction (CS; a positive attribute), burnout (BO), and secondary traumatic stress (STS) in practice owners and nonowners both as scores and as score categories (low, moderate, and high CS, BO, and STS). For hypothesis tests, propensity score matching was used, with owners (n = 595) matched to nonowners (595) on several demographic and employment factors. Results: Owners had significantly (P < .001) higher CS scores (mean ± SE, 34.1 ± 0.3) and lower BO scores (26.1 ± 0.3) than nonowners (32.8 ± 0.3 and 26.9 ± 0.3, respectively), but STS scores were comparable between groups (27.4 ± 0.3 and 27.5 ± 0.3; P = .55). The prevalence of low CS scores and high BO scores was significantly (P < .001) higher for nonowners versus owners (53.8% vs 42.7% and 51.6% vs 46.4%, respectively). Both owners and nonowners had a high prevalence of high STS scores (81.8% and 83.2%, respectively; P = .53). Clinical Relevance: Results suggested that practice ownership confers a benefit to private practice veterinarians in terms of CS and BO, but not STS. The prevalence of poor CS, BO, and STS scores was higher than reported previously for 2016 to 2018, suggesting an impact of the COVID-19 pandemic. The high prevalence of high STS scores in both groups warrants attention and action to protect the welfare of the veterinary workforce and support optimal patient care.

Nonveterinarian staff increase revenue and improve veterinarian productivity in mixed and companion animal veterinary practices in the United States.

OBJECTIVE: To determine the contributions of veterinarians and support staff to revenue and veterinarian productivity (ie, number of patients seen/full-time-equivalent veterinarian/wk) in private mixed and companion animal practices in the US and identify staff-to-veterinarian labor ratios (SVLRs) that maximized these 2 practice outputs. SAMPLE: 409 owners of mixed and companion animal practices who participated in the 2020 AVMA Practice Owner Survey. PROCEDURES: Data regarding owner demographics, practice characteristics, labor (defined as mean total hours worked/wk), and gross revenue in 2019 were obtained from participating practices. Multivariable ordinary least-squares regression was used to identify factors associated with revenue and productivity as well as the SVLRs at which revenue and productivity were maximized. RESULTS: For each 10% increase in total veterinarian hours worked per week, revenue increased by a mean of approximately 9%. A 1-unit increase in total number of technician hours used to support 1 hour of veterinarian work was associated with a 20.5% increase in revenue but with no change in productivity. The same increase in total number of nonmedical staff hours was associated with a 17.0% increase in revenue and 14.4% increase in productivity. In terms of revenue, the optimal SVLRs for veterinary technicians and nonmedical staff were 9:1 and 8:1, respectively. In terms of productivity, the optimal SVLR for nonmedical staff was 10:1. CLINICAL RELEVANCE: Findings confirmed the important role of nonveterinarian staff in revenue and veterinarian productivity in mixed animal and companion animal practices and may be useful for making evidence-based staffing decisions.

Do DOM optical parameters improve the prediction of copper availability in vineyard soils?

Accumulation of copper (Cu) in soils due to the application of fungicides may be toxic for organisms and hence affect winegrowing sustainability. Soil parameters such as pH and dissolved organic matter (DOM) are known to affect the availability of Cu. In this study, we investigated the contribution of chromophoric and fluorescent DOM properties to the prediction of Cu availability in 18 organic vineyard soils in the Bordeaux winegrowing area (France). The DOM parameters, assessed through absorbance and fluorescence analyses, and proxies for Cu availability (total soluble Cu and free ionic Cu2+) were measured in 0.01 M KCl extracts. Total soluble Cu (CuKCl) varied 23-fold while free ionic Cu2+ varied by a factor of 4600 among the soils. DOC concentrations were similar among the soils, but the samples differed in the quality of DOM as assessed by optical spectroscopy. Multilinear regression models with and without DOM quality parameters were investigated to predict Cu availability. The best model for CuKCl successfully explained 83% of variance and included pH, CuT, and two DOM fluorescence quality indices, the FI fluorescence index, which distinguishes between microbial and higher plant origins, and the HIX humification index. For the prediction of Cu2+, pH alone explained 88% of variance and adding DOM parameters did not improve modelling. The two Cu availability proxies were related to pH. This study confirms the prominent role of pH in Cu availability and underlines the importance of DOM quality to better predict Cu solubility.

Compassion satisfaction, burnout, and secondary traumatic stress among full-time veterinarians in the United States (2016-2018).

OBJECTIVE: To determine prevalences of low compassion satisfaction (CS), high burnout (BO), and high secondary traumatic stress (STS) scores among full-time US veterinarians and estimate effects of selected demographic, employment-related, and education-related factors on those scores. SAMPLE: 5,020 full-time veterinarians who participated in the 2016, 2017, and 2018 AVMA Census of Veterinarians surveys. PROCEDURES: Data were obtained from census surveys regarding demographic, employment-related, and education-related factors, and scores assigned to items from a professional quality-of-life instrument designed to measure CS and compassion fatigue (ie, BO and STS) were compared between and among various demographic and employment groups. RESULTS: Overall, 35.5% of veterinarians were classified as having low CS scores, 50.2% as having high BO scores, and 58.9% as having high STS scores. Controlling for other variables, high educational debt was associated with low CS, high BO, and high STS scores. Veterinarians who spent ≥ 75% of their time working with dogs or cats had higher BO and STS scores than did those who spent < 25% of their time. Veterinarians with more experience and higher annual incomes had higher CS scores and lower BO and STS scores. Women had higher BO and STS scores than did men, but no gender differences were observed in CS scores. CONCLUSIONS AND CLINICAL RELEVANCE: Several variables were identified that may put veterinarians at higher risk than others for compassion fatigue and low CS. These findings may be useful in the development of resources and targeted initiatives to support and defend veterinarian well-being.

Online procurement of pet supplies and willingness to pay for veterinary telemedicine.

Changing consumer shopping behaviors, and specifically the shift towards online procurement of goods and services, have altered the retail landscape of nearly all goods, including pet products and services. Whilst it is known and commonly discussed that less retail business for products and medications is being conducted in clinics than in the past, it is not well documented where that commerce is now taking place, and by what customer segments. For cats, dogs, and other pets, specialty food and food in general was purchased by a high percentage of respondents at the physical store. Sixteen-percent of dog owners, 17 % of cat owners and 14 % of other animal owners purchased prescription food at the veterinarian. Ten percent of dog owners, 10 % of cat owners, and 9 % of other animal owners purchased prescription food from the physical store. A high percentage of cat and dog owners purchased flea and tick preventative, heartworm preventative and prescription medications at the veterinarian, followed by the physical store. Using a choice experiment, both dog and cat owners were willing-to-pay a statistically significant positive amount for having their veterinarian, or a veterinarian in their community (who was not their veterinarian) on the veterinary telemedicine call or video when compared to a veterinarian from outside the community. In relation to the willingness to pay (WTP) for a telemedicine veterinary consultation with a veterinarian outside of the pet owners' community, dog owners were willing to pay $38.04 more for a telemedicine veterinary consultation with their regular veterinarian, and $13.38 more for a telemedicine veterinary consultation with a veterinarian in the dog owners' community. Cat owners had a WTP of $38.12 per call or visit for having their veterinarian as the consultant which was statistically higher than their WTP for a veterinarian in their community, $12.74 when compared to a veterinarian outside their community. When comparing the mean price adjusted WTP between cat and dog owners, there were not any statistically significant differences found. Quantifying pet owner willingness to pay for commonly discussed attributes of telemedicine, such as whether a local veterinarian is consulted (versus a veterinarian from outside the community), facilitates veterinary practice management decision making as practices adjust product and service offerings to meet the changing consumer demand of pet owners in today's marketplace.

Familiarity and Use of Veterinary Services by US Resident Dog and Cat Owners.

Pet ownership, veterinary use, and beliefs regarding veterinary care were elicited through the use of a nationally representative survey of 997 U.S. residents. Fifty-one percent of respondents have or had a dog in the past five years and 37% have or had a cat in the past five years. Over ninety percent of cat and dog owners had visited a veterinarian at any time, but only about 40% visited a veterinarian annually. With the rise of options in veterinary medicine, including low-cost options for vaccines and spay/neuter, further study and analysis of pet-owners use of veterinary care is warranted. Fifty-four percent of dog owners and 40% of cat owners who went to a low-cost spay/neuter clinic also went to a veterinarian/clinic/practice. This finding suggests that pet-owners who use low-cost options do so in a manner that supplements rather than replaces traditional veterinary care. Logit models were employed to evaluate the relationship between dog and cat owner demographics and visiting a veterinarian. The probability of visiting a veterinarian increased with age and income for dog owners.

A census of veterinarians in the United States.

Analysis of the AVMA's electronic membership database provided information on 113,394 veterinarians living in the United States in 2018. At 39%, Millennials represented the highest percentage of the US veterinary workforce, and women (61.7%) outnumbered men (38.2%). Mean age at the time of graduation has increased since 1975, raising concerns that career length for veterinarians may be decreasing, potentially exacerbating veterinarian shortages. Overall, 83.9% of veterinarians were in private clinical practice, and substantial increases between 2008 and 2018 were seen in the numbers of veterinarians in emergency and critical care medicine and in referral or specialty practice.