Deniece R. Williams
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View article: Daily Milk Losses Associated with Dairy Cow Bunching, Cattle’s Protective Behavior Against Stable Flies (Stomoxys calcitrans) in California
Daily Milk Losses Associated with Dairy Cow Bunching, Cattle’s Protective Behavior Against Stable Flies (Stomoxys calcitrans) in California Open
Cow bunching is a behavioral phenomenon where cattle aggregate in tight groups to protect themselves from biting by stable flies (Stomoxys calcitrans L.). The incidence of bunching varies between dairies and even among pens within the same…
View article: Analysis of Antimicrobial Residues and Resistance Profiles of Escherichia coli and Enterococcus spp. in Lagoon Water from California Dairies
Analysis of Antimicrobial Residues and Resistance Profiles of Escherichia coli and Enterococcus spp. in Lagoon Water from California Dairies Open
The widespread use of antimicrobial drugs (AMDs) in livestock production contributes to antimicrobial resistance (AMR), a global One Health concern affecting humans, animals, and the environment. This study analyzed AMD residues and the AM…
View article: Effect of Multi-Species Probiotic Supplementation on Fecal Microbiota in Pre-Weaned Holstein Dairy Calves in California
Effect of Multi-Species Probiotic Supplementation on Fecal Microbiota in Pre-Weaned Holstein Dairy Calves in California Open
The gross benefit of feeding multi-species probiotics has been reported, but the effect on the gut microbiota in pre-weaned dairy calves has not been elucidated. To address this gap, a randomized controlled trial was conducted in Californi…
View article: Antimicrobial drug use and its association with antimicrobial resistance in fecal commensals from cows on California dairies
Antimicrobial drug use and its association with antimicrobial resistance in fecal commensals from cows on California dairies Open
The current study objective was to investigate the risk factors associated with the isolation of antimicrobial-resistant Escherichia coli , Enterococcus spp., and Streptococcus spp. (ES) from the feces of dairy cows in California (CA). A l…
View article: Antimicrobial Resistance Genes in Respiratory Bacteria from Weaned Dairy Heifers
Antimicrobial Resistance Genes in Respiratory Bacteria from Weaned Dairy Heifers Open
Bovine respiratory disease (BRD) is the leading cause of mortality and antimicrobial drug (AMD) use in weaned dairy heifers. Limited information is available regarding antimicrobial resistance (AMR) in respiratory bacteria in this populati…
View article: Impact of zinc supplementation on phenotypic antimicrobial resistance of fecal commensal bacteria from pre-weaned dairy calves
Impact of zinc supplementation on phenotypic antimicrobial resistance of fecal commensal bacteria from pre-weaned dairy calves Open
The objective of this study was to evaluate the impact of dietary zinc supplementation in pre-weaned dairy calves on the phenotypic antimicrobial resistance (AMR) of fecal commensal bacteria. A repository of fecal specimens from a random s…
View article: Antimicrobial Susceptibility in Respiratory Pathogens and Farm and Animal Variables in Weaned California Dairy Heifers: Logistic Regression and Bayesian Network Analyses
Antimicrobial Susceptibility in Respiratory Pathogens and Farm and Animal Variables in Weaned California Dairy Heifers: Logistic Regression and Bayesian Network Analyses Open
Weaned dairy heifers are a relatively understudied production group. Bovine respiratory disease (BRD) is the most common cause of antimicrobial drug (AMD) use, morbidity, and mortality in this production group. The study of antimicrobial r…
View article: Effect of dry cow therapy on antimicrobial resistance of mastitis pathogens post-calving
Effect of dry cow therapy on antimicrobial resistance of mastitis pathogens post-calving Open
The aim of this study was to evaluate the effect of dry cow therapy (DCT) on the antimicrobial resistance (AMR) profile of mastitis pathogens post-calving. A repository of isolates based on a DCT trial was utilized for the current study. A…
View article: Evaluation of antimicrobial resistance and risk factors for recovery of intrauterine Escherichia coli from cows with metritis on California commercial dairy farms
Evaluation of antimicrobial resistance and risk factors for recovery of intrauterine Escherichia coli from cows with metritis on California commercial dairy farms Open
Metritis is a major uterine disease in dairy cattle, typically occurring within 21 days post-partum, and the fourth most common health issue in cows as identified by producers. Currently, little is known of MICs of intrauterine E. coli (…
View article: Effect of Group Housing of Preweaned Dairy Calves: Health and Fecal Commensal Antimicrobial Resistance Outcomes
Effect of Group Housing of Preweaned Dairy Calves: Health and Fecal Commensal Antimicrobial Resistance Outcomes Open
The objectives of this study were to investigate the effects of group housing (three calves per group) on bovine respiratory disease (BRD), diarrhea and antimicrobial resistance (AMR) to fecal commensal Escherichia coli (EC) and enterococc…
View article: Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Milk Production and Somatic Cell Count Outcomes
Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Milk Production and Somatic Cell Count Outcomes Open
Mastitis is the greatest disease challenge for dairy producers, with substantial economic impacts due to lost milk production. Amongst the approaches implemented to control and prevent mastitis on dairies are vaccination, pre- and post-mil…
View article: Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Clinical Mastitis and Culling Outcomes
Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Clinical Mastitis and Culling Outcomes Open
Intramammary antibiotic (AB) and internal teat sealants (TS) infusion at dry-off have been used to prevent intramammary infections (IMI) in dairy cows during the dry period and reduce the risk of mastitis during the dry period and subseque…
View article: Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line
Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line Open
Background Microbiota play important roles in the gastrointestinal tract (GIT) of dairy cattle as the communities are responsible for host health, growth, and production performance. However, a systematic characterization and comparison of…
View article: Bayesian estimation of sensitivity and specificity of a rapid mastitis test kit, bacterial culture, and PCR for detection of Staphylococcus aureus, Streptococcus species, and coliforms in bovine milk samples
Bayesian estimation of sensitivity and specificity of a rapid mastitis test kit, bacterial culture, and PCR for detection of Staphylococcus aureus, Streptococcus species, and coliforms in bovine milk samples Open
Our objectives were to evaluate the diagnostic accuracy of a rapid and novel immunochromatography-based mastitis kit that includes 3 independent tests to detect coliforms (Escherichia coli or Klebsiella pneumoniae), Streptococcus spp., and…
View article: Additional file 4 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line
Additional file 4 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line Open
Additional file 4: Supplementary file 2. SparCC table. Table of calculated SparCC correlations and pseudo p-values for 61 OTUs that had strong correlations with at least one other OTU.
View article: Additional file 6 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line
Additional file 6 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line Open
Additional file 6: Supplementary file 4. The table of function predictions generated by the Tax4Fun2 program.
View article: Additional file 2 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line
Additional file 2 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line Open
Additional file 2: Supplementary file 1. Normalized OTU table. The table includes the information of OTU ID, abundance, and taxonomic assignment for each OTU.
View article: Additional file 5 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line
Additional file 5 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line Open
Additional file 5: Supplementary file 3. Taxonomic table. Table of taxonomic classification of 61 strongly correlated OTUs.
View article: Additional file 7 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line
Additional file 7 of Dynamic changes in fecal bacterial microbiota of dairy cattle across the production line Open
Additional file 7: Supplementary file 5. The table of pathway predictions generated by the Tax4Fun2 program.
View article: Stable fly activity is associated with dairy management practices and seasonal weather conditions
Stable fly activity is associated with dairy management practices and seasonal weather conditions Open
Stable flies ( Stomoxys calcitrans) are blood-sucking insects commonly associated with cattle production systems worldwide and are known to cause severe irritation to cattle due to painful bites. Cattle react to biting stable flies with an…
View article: Peer Review #1 of "Dairy management practices associated with multi-drug resistant fecal commensals and Salmonella in cull cows: a machine learning approach (v0.1)"
Peer Review #1 of "Dairy management practices associated with multi-drug resistant fecal commensals and Salmonella in cull cows: a machine learning approach (v0.1)" Open
Background: Understanding the effects of herd management practices on the prevalence of multidrug-resistant pathogenic Salmonella and commensals Enterococcus spp.and Escherichia coli in dairy cattle is key in reducing antibacterial resista…
View article: Peer Review #2 of "Dairy management practices associated with multi-drug resistant fecal commensals and Salmonella in cull cows: a machine learning approach (v0.1)"
Peer Review #2 of "Dairy management practices associated with multi-drug resistant fecal commensals and Salmonella in cull cows: a machine learning approach (v0.1)" Open
Background: Understanding the effects of herd management practices on the prevalence of multidrug-resistant pathogenic Salmonella and commensals Enterococcus spp.and Escherichia coli in dairy cattle is key in reducing antibacterial resista…
View article: Peer Review #1 of "Dairy management practices associated with multi-drug resistant fecal commensals and Salmonella in cull cows: a machine learning approach (v0.2)"
Peer Review #1 of "Dairy management practices associated with multi-drug resistant fecal commensals and Salmonella in cull cows: a machine learning approach (v0.2)" Open
Background: Understanding the effects of herd management practices on the prevalence of multidrug-resistant pathogenic Salmonella and commensals Enterococcus spp.and Escherichia coli in dairy cattle is key in reducing antibacterial resista…
View article: 2018 Survey of antimicrobial drug use and stewardship practices in adult cows on California dairies: post-Senate Bill 27
2018 Survey of antimicrobial drug use and stewardship practices in adult cows on California dairies: post-Senate Bill 27 Open
Background A survey of California (CA) dairies was performed in spring 2018 to characterize antimicrobial stewardship practices, antimicrobial drug (AMD) use, and health management of adult cows on CA dairies since the implementation of th…
View article: 2018 Survey of factors associated with antimicrobial drug use and stewardship practices in adult cows on conventional California dairies: immediate post-Senate Bill 27 impact
2018 Survey of factors associated with antimicrobial drug use and stewardship practices in adult cows on conventional California dairies: immediate post-Senate Bill 27 impact Open
Background Antimicrobial drugs (AMD) are critical for the treatment, control, and prevention of diseases in humans and food-animals. Good AMD stewardship practices and judicious use of AMD are beneficial to the preservation of animal and h…
View article: Survey on Antimicrobial Drug Use Practices in California Preweaned Dairy Calves
Survey on Antimicrobial Drug Use Practices in California Preweaned Dairy Calves Open
The California (CA) dairy industry was surveyed in July 2017 to evaluate producers' knowledge and perceptions and antimicrobial drug (AMD) use in preweaned dairy calves following the implementation of the nationwide veterinary feed directi…
View article: Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows
Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows Open
Background This study describes the occurrence of antimicrobial resistance (AMR) in commensal Escherichia coli and Enterococcus/Streptococcus spp. (ES) isolated from fecal samples of dairy cows and assesses the variation of AMR profiles ac…
View article: A novel risk assessment tool for bovine respiratory disease in preweaned dairy calves
A novel risk assessment tool for bovine respiratory disease in preweaned dairy calves Open
Due to the increased morbidity and mortality of bovine respiratory disease (BRD) in dairy calves, as well as an increasing urgency for the judicious use of antimicrobials in farm animals, a comprehensive risk assessment tool for BRD in pre…
View article: Bovine Respiratory Disease (BRD) Risk Assessment Tool
Bovine Respiratory Disease (BRD) Risk Assessment Tool Open
The Bovine Respiratory Disease (BRD) risk assessment tool for preweaned calves on dairies relies on scores that are proportional to the association measures observed between management risk factors and BRD. The scores were based on data se…
View article: Correction: Risk factors affecting dairy cattle protective grouping behavior, commonly known as bunching, against Stomoxys calcitrans (L.) on California dairies
Correction: Risk factors affecting dairy cattle protective grouping behavior, commonly known as bunching, against Stomoxys calcitrans (L.) on California dairies Open
[This corrects the article DOI: 10.1371/journal.pone.0224987.].