E. Royster
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View article: Relationships between method used for bedding processing and presence of mastitis and nonmastitis pathogens in ready-to-use recycled manure solids bedding on Midwest dairy farms
Relationships between method used for bedding processing and presence of mastitis and nonmastitis pathogens in ready-to-use recycled manure solids bedding on Midwest dairy farms Open
Field studies have examined how processing methods affect mastitis pathogen levels in ready-to-use (RTU) recycled manure solids (RMS), but few have assessed their impact on nonmastitis pathogens. This cross-sectional study investigated ass…
View article: Efficacy of a stabilized liquid potassium sorbate preservative to prevent bacterial proliferation in bovine colostrum and milk
Efficacy of a stabilized liquid potassium sorbate preservative to prevent bacterial proliferation in bovine colostrum and milk Open
This study aimed to describe the effect of a potassium sorbate preservative on bacterial proliferation in bovine colostrum and milk, and on colostrum pH and IgG concentrations, when stored at refrigeration (RF) or room temperature (RT) for…
View article: Methods of processing recycled manure solids bedding on Midwest dairy farms II: Relationships between bedding characteristics and bedding bacterial count
Methods of processing recycled manure solids bedding on Midwest dairy farms II: Relationships between bedding characteristics and bedding bacterial count Open
The first objective of this study was to identify bedding characteristics associated with bedding bacterial count (BBC) in ready-to-use (RTU) recycled manure solids (RMS). The second objective was to explore the association between process…
View article: Investigation of the relationship between manure processing method and levels of mastitis pathogens in recycled manure solids bedding on Midwest dairy farms
Investigation of the relationship between manure processing method and levels of mastitis pathogens in recycled manure solids bedding on Midwest dairy farms Open
While many dairies use green (GRN) recycled manure solids (RMS) bedding, some first process slurry through an anaerobic digester (DIG), while others have adopted secondary (SEC) processing methods such as mechanical composters (COM), hot …
View article: Pilot study: Refining a culture-guided selective dry cow therapy program to enhance antimicrobial stewardship on dairy farms
Pilot study: Refining a culture-guided selective dry cow therapy program to enhance antimicrobial stewardship on dairy farms Open
Selective dry cow therapy (SDCT) programs typically use either milk culture or algorithm methods to identify cows with a high risk of infection, and thereby warranting antimicrobial therapy (AMX) at dry off (DO). Multiple studies have demo…
View article: Investigation of the relationship between manure processing method and presence of M. avium subsp. paratuberculosis and Salmonella spp. in recycled manure solids bedding on Midwest dairy farms
Investigation of the relationship between manure processing method and presence of M. avium subsp. paratuberculosis and Salmonella spp. in recycled manure solids bedding on Midwest dairy farms Open
While many dairies use green (GRN) recycled manure solids (RMS) bedding, some first process slurry through an anaerobic digester (DIG), while others have adopted secondary (SEC) processing methods such as mechanical composters (COM), hot …
View article: Negatively controlled trial investigating the effects of dry cow therapy on clinical mastitis and culling in multiparous cows
Negatively controlled trial investigating the effects of dry cow therapy on clinical mastitis and culling in multiparous cows Open
Blanket dry cow therapy (DCT) is a major contributor to overall antibiotic usage on dairy farms in the United States. With low prevalence of intramammary infections at dry-off in US herds today, alternative DCT approaches have been the foc…
View article: Methods of processing recycled manure solids bedding on Midwest dairy farms I: Associations with bedding bacteria counts, milk quality, udder health and milk production
Methods of processing recycled manure solids bedding on Midwest dairy farms I: Associations with bedding bacteria counts, milk quality, udder health and milk production Open
This observational study investigated the relationships between method of processing recycled manure solids (RMS) bedding and 1) bacteria counts in RMS bedding, 2) bacteria counts in bulk tank milk, and 3) udder health and milk production.…
View article: Evaluation of 4 predictive algorithms for intramammary infection status in late-lactation cows
Evaluation of 4 predictive algorithms for intramammary infection status in late-lactation cows Open
The objective of this observational study was to compare 4 cow-level algorithms to predict cow-level intramammary infection (IMI) status (culture and MALDI-TOF) in late-lactation US dairy cows using standard measures of test performance. S…
View article: Partial budget analysis of culture- and algorithm-guided selective dry cow therapy
Partial budget analysis of culture- and algorithm-guided selective dry cow therapy Open
The objectives of this study were to (1) use partial budget analysis to estimate the cash impact for herds that switch from blanket dry cow therapy (BDCT) to culture- or algorithm-guided selective dry cow therapy (SDCT) and (2) conduct a s…
View article: Postcalving udder health and productivity in cows approaching dry-off with intramammary infections caused by non-aureus Staphylococcus, Aerococcus, Enterococcus, Lactococcus, and Streptococcus species
Postcalving udder health and productivity in cows approaching dry-off with intramammary infections caused by non-aureus Staphylococcus, Aerococcus, Enterococcus, Lactococcus, and Streptococcus species Open
The objective of this prospective cohort study was to explore associations between intramammary infection (IMI) in late-lactation cows and postcalving udder health and productivity. Cows (n = 2,763) from 74 US dairy herds were recruited as…
View article: Investigation of the relationship between method of processing recycled manure solids bedding and udder health and production on Midwest dairy farms
Investigation of the relationship between method of processing recycled manure solids bedding and udder health and production on Midwest dairy farms Open
There has been a rapid increase in adoption of recycled manure solids (RMS) as bedding in Midwest dairy herds over the past 10 to 15 years due to perceived advantages such as cost and availability. Several studies have reported increased b…
View article: Investigation of the relationship between method of processing and bacteria counts in ready-to-use recycled manure solids bedding on Midwest dairy farms
Investigation of the relationship between method of processing and bacteria counts in ready-to-use recycled manure solids bedding on Midwest dairy farms Open
There has been a rapid increase in adoption of recycled manure solids (RMS) as bedding in Midwest dairy herds over the past 10 to 15 years due to perceived advantages such as cost and availability. However, several studies have reported in…
View article: Efficacy of a stabilized liquid potassium sorbate preservative to reduce bacterial proliferation in colostrum or tank milk stored by refrigeration or at room temperature
Efficacy of a stabilized liquid potassium sorbate preservative to reduce bacterial proliferation in colostrum or tank milk stored by refrigeration or at room temperature Open
Though critical to calf health and growth, colostrum exposure of dairy calves to infectious agents, potentially resulting in calfhood illness and/or reduced absorption of colostral antibodies. While FDA-approved preservatives such as potas…
View article: Randomized controlled non-inferiority trial investigating the effect of 2 selective dry-cow therapy protocols on antibiotic use at dry-off and dry period intramammary infection dynamics
Randomized controlled non-inferiority trial investigating the effect of 2 selective dry-cow therapy protocols on antibiotic use at dry-off and dry period intramammary infection dynamics Open
Selective dry-cow therapy (SDCT) could be used to reduce antibiotic use on commercial dairy farms in the United States but is not yet widely adopted, possibly due to concerns about the potential for negative effects on cow health. The obje…
View article: Methods Used to Assess Student Performance and Course Outcomes at the National Center of Excellence in Dairy Production Medicine Education for Veterinarians
Methods Used to Assess Student Performance and Course Outcomes at the National Center of Excellence in Dairy Production Medicine Education for Veterinarians Open
Between 2012 and 2014, three cohorts of senior veterinary students participated in an 8-week dairy production medicine course created by the National Center of Excellence in Dairy Production Medicine Education for Veterinarians. One goal o…
View article: Randomized controlled trial investigating the effect of 2 selective dry-cow therapy protocols on udder health and performance in the subsequent lactation
Randomized controlled trial investigating the effect of 2 selective dry-cow therapy protocols on udder health and performance in the subsequent lactation Open
The objective of this study was to compare culture- and algorithm-guided selective dry-cow therapy (SDCT) programs with blanket dry-cow therapy (BDCT) in a multi-site, randomized, natural exposure clinical trial for the following cow-level…
View article: Randomized equivalence study comparing the efficacy of 2 commercial internal teat sealants in dairy cows
Randomized equivalence study comparing the efficacy of 2 commercial internal teat sealants in dairy cows Open
The use of an internal teat sealant (ITS) at dry-off has been repeatedly shown to improve udder health in the subsequent lactation. However, almost all ITS research conducted in North America has evaluated one product (Orbeseal, Zoetis, Pa…
View article: Prior Experience, Career Intentions, and Post-Graduate Positions of Veterinary Students Who Participated in an 8-week Dairy Production Medicine Course
Prior Experience, Career Intentions, and Post-Graduate Positions of Veterinary Students Who Participated in an 8-week Dairy Production Medicine Course Open
Three cohorts of senior veterinary students ( n = 50) from seven United States (US) colleges of veterinary medicine took an 8-week dairy production medicine course at the Dairy Center of Excellence in Production Medicine Education for Vete…
View article: Cross-sectional study of the relationship between cloth udder towel management, towel bacteria counts, and intramammary infection in late-lactation dairy cows
Cross-sectional study of the relationship between cloth udder towel management, towel bacteria counts, and intramammary infection in late-lactation dairy cows Open
Because cloth udder towels (CUT) may function as a fomite for mastitis-causing pathogens, most udder health laboratories offer towel culture services as a tool to monitor towel hygiene. However, no studies have investigated if an associati…
View article: Cross-sectional study of the relationships among bedding materials, bedding bacteria counts, and intramammary infection in late-lactation dairy cows
Cross-sectional study of the relationships among bedding materials, bedding bacteria counts, and intramammary infection in late-lactation dairy cows Open
Objectives of this study were to (1) describe the intramammary infection (IMI) prevalence and pathogen profiles in quarters of cows approaching dry-off in US dairy herds, (2) compare IMI prevalence in quarters of cows exposed to different …
View article: Selective dry cow therapy on US dairy farms
Selective dry cow therapy on US dairy farms Open
There is an opportunity to reduce antibiotic (ABX) use at dry-off in US dairy farms, as approximately 80% of herds practice blanket dry cow therapy (BDCT), despite most quarters (~80%) being uninfected at that time. Selective dry cow thera…
View article: Chipping away at the tough questions about bedding management and mastitis
Chipping away at the tough questions about bedding management and mastitis Open
Over the past several decades, the dairy industry and mastitis researchers have, collectively, made great progress in improving our understanding of the role of bedding selection and management as a determinant of mastitis risk. Increased …
View article: Relationships among bedding materials, bedding bacteria counts, udder hygiene, milk quality, and udder health in US dairy herds
Relationships among bedding materials, bedding bacteria counts, udder hygiene, milk quality, and udder health in US dairy herds Open
Bedding is an important source of teat end exposure to environmental mastitis pathogens. To better control environmental mastitis, we need an improved understanding of the relationships among bedding selection and management, bedding bacte…
View article: Investigation of the relationship between bacteria counts and bedding characteristics with udder health and milk quality on U.S. dairy farms
Investigation of the relationship between bacteria counts and bedding characteristics with udder health and milk quality on U.S. dairy farms Open
The major objective of this multi-herd observational study was to describe the relationship between BBC and udder health and to identify cutpoints for interpreting bedding culture results. A secondary objective was to identify bedding char…
View article: Investigation of the relationship between bedding materials, bedding characteristics, and intramammary infection in late lactation dairy cows
Investigation of the relationship between bedding materials, bedding characteristics, and intramammary infection in late lactation dairy cows Open
Many cows acquire subclinical intramammary infections (IMI) during lactation, necessitating antimicrobial treatment at dry-off (dry cow therapy). If the dairy industry moves toward the adoption of selective dry cow therapy, one essential s…
View article: Investigation of the relationship between udder towel hygiene, udder towel management and intramammary infection in late lactation dairy cows
Investigation of the relationship between udder towel hygiene, udder towel management and intramammary infection in late lactation dairy cows Open
Pre-milking cleaning and teat disinfection is a common practice on US dairy farms. Studies have shown that towel laundering practices can influence levels of bacteria in towels that are used in teat preparation. Consequently, some laborato…
View article: Evaluation of an automated milk leukocyte differential test for detecting intramammary infection in early- and late-lactation quarters and cows
Evaluation of an automated milk leukocyte differential test for detecting intramammary infection in early- and late-lactation quarters and cows Open
The dairy industry must develop mastitis control practices that can use antimicrobials judiciously while maintaining or improving udder health. One opportunity is the adoption of selective dry cow therapy (SDCT) programs that treat only in…