T.F. Duffield
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View article: Facilities and housing, husbandry, and health management practices on Quebec dairy farms: A retrospective descriptive study
Facilities and housing, husbandry, and health management practices on Quebec dairy farms: A retrospective descriptive study Open
The objective of this retrospective descriptive study was to characterize housing and herd management practices of Quebec dairy farms. Pre-existent survey data (housing, husbandry, and herd health; 36 questions) collected in person by Lact…
View article: Describing the decision-making process of Ontario dairy farmers when managing down dairy cattle: A qualitative focus group study
Describing the decision-making process of Ontario dairy farmers when managing down dairy cattle: A qualitative focus group study Open
The objective of this study was to investigate Ontario dairy farmers' attitudes and perceptions toward down dairy cows, and the barriers and motivators influencing the use of best management practices. Four focus groups were conducted in s…
View article: Factors influencing Ontario dairy veterinarians’ management and care of down dairy cows
Factors influencing Ontario dairy veterinarians’ management and care of down dairy cows Open
This cross-sectional study assessed what management practices veterinarians recommended for down dairy cows in Ontario, Canada, and identified factors influencing producers’ adoption of protocols. An online survey about veterinary involvem…
View article: Evaluating a selective therapy approach to antimicrobial treatment of high-risk calves at arrival to a male dairy calf rearing facility on future health, growth and antimicrobial use: A group randomized controlled trial
Evaluating a selective therapy approach to antimicrobial treatment of high-risk calves at arrival to a male dairy calf rearing facility on future health, growth and antimicrobial use: A group randomized controlled trial Open
The objective of this group randomized controlled trial was to compare a selective therapy strategy to a conventional group antimicrobial strategy at the time of arrival on mortality, morbidity, average daily gain and antimicrobial use. D…
View article: Factors associated with Ontario dairy producers' management and care of down dairy cattle
Factors associated with Ontario dairy producers' management and care of down dairy cattle Open
The objective of this study was to better understand current management practices for down cows in Ontario, Canada, and to identify factors associated with the adoption of acceptable practices. An online survey was distributed to all dairy…
View article: Improving market (cull) dairy cows' carcass traits and meat quality
Improving market (cull) dairy cows' carcass traits and meat quality Open
Despite a high volume of market (cull) dairy cows entering the food chain every year, beef from market dairy cows is largely considered insignificant when compared with beef from beef cattle in the market and is widely thought to be usable…
View article: An evaluation form to aid dairy producers to systematically assess cows prior to culling.
An evaluation form to aid dairy producers to systematically assess cows prior to culling. Open
Despite the completion of 323 forms, only ~1/3 were completed fully, with compliance highest for body condition score, lameness, and temperature recordings (> 90% of forms). A cull cow evaluation form may improve the thoroughness and consi…
View article: Effect of glycerol supplementation in early lactation on metabolic health, milking activity, and production of dairy cows in automated milking system herds
Effect of glycerol supplementation in early lactation on metabolic health, milking activity, and production of dairy cows in automated milking system herds Open
The objective of this study was to quantify the effects of supplementing early-lactation cows with a dry pure glycerol product, delivered through the automated milking system (AMS) concentrate, in the first 21 DIM on metabolic markers, mil…
View article: Identification of genetic markers associated with hyperketonemia patterns in early lactation Holstein cows
Identification of genetic markers associated with hyperketonemia patterns in early lactation Holstein cows Open
Ketosis, evidenced by hyperketonemia with elevated blood β‐hydroxybutyrate (BHB) levels, is a significant metabolic disorder of dairy cattle, typically diagnosed within the first 6 weeks post‐calving when high energy levels are essential t…
View article: Can 60 days of feeding lead to increased fitness for transport in cull dairy cows?
Can 60 days of feeding lead to increased fitness for transport in cull dairy cows? Open
The welfare of cull cows during transport to slaughter is a current concern in the Canadian dairy industry. Cull cows sold through auction often have a high prevalence of lameness, low BCS, hock lesions, and udder engorgement. To evaluate …
View article: Farm-level risk factors associated with increased milk β-hydroxybutyrate and hyperketolactia prevalence on farms with automated milking systems
Farm-level risk factors associated with increased milk β-hydroxybutyrate and hyperketolactia prevalence on farms with automated milking systems Open
The objectives of this study were to determine the farm-level hyperketolactia (HKL) prevalence, as diagnosed from the milk BHB concentration, on dairy farms milking with an automated milking system (AMS) and to describe the farm-level hous…
View article: Corrigendum to “Characterizing ruminal acidosis risk: A multiherd, multicountry study” (J. Dairy Sci. 106:3155–3175)
Corrigendum to “Characterizing ruminal acidosis risk: A multiherd, multicountry study” (J. Dairy Sci. 106:3155–3175) Open
In the Results and Discussion section of this article, 2 values were inverted. The 2 corrected numbers are marked in boldface below. There were 261 cows from 32 farms classified into 1 of the 3 acidosis risk groups, 26.1% of the cows class…
View article: Farm-level nutritional factors associated with milk production and milking behavior on Canadian farms with automated milking systems
Farm-level nutritional factors associated with milk production and milking behavior on Canadian farms with automated milking systems Open
The objective of this study was to describe the nutritional strategies used on Canadian dairy farms with automated milking systems (AMS), both at the feed bunk and the concentrate offered at the AMS, as well as to determine what dietary co…
View article: Effect of pre- and postpartum supplementation of a pure glycerol product to dairy cows on feeding behavior, lying behavior, and reticulorumen pH
Effect of pre- and postpartum supplementation of a pure glycerol product to dairy cows on feeding behavior, lying behavior, and reticulorumen pH Open
The objective of this study was to quantify the effects of supplementing a low level of dry glycerol product pre- and postpartum on the feeding behavior, lying behavior, and reticulorumen pH of dairy cows. Multiparous Holstein dairy cows (…
View article: Identification of genetic markers associated with hyperketonemia patterns in early lactation Holstein cows
Identification of genetic markers associated with hyperketonemia patterns in early lactation Holstein cows Open
Additional File 1- Table S1. Descriptive statistics for blood BHB concentration (mmol/L) in Holstein cows were included in an observational study to assess their hyperketonemia patterns in the two weeks postpartum followed by diagnosis and…
View article: Effect of pre- and postpartum supplementation of a pure glycerol product to dairy cows on feed intake, metabolic markers, and milk yield and components
Effect of pre- and postpartum supplementation of a pure glycerol product to dairy cows on feed intake, metabolic markers, and milk yield and components Open
The objective of this study was to quantify the effects of supplementing transition dairy cows with a low inclusion dry glycerol product in the pre- and postpartum periods on feed intake, metabolic markers, and milk yield and components. M…
View article: Impact of plane of nutrition and analgesic treatment on wound healing and pain following cautery disbudding in preweaned dairy calves
Impact of plane of nutrition and analgesic treatment on wound healing and pain following cautery disbudding in preweaned dairy calves Open
Nutrition has been reported to be a crucial part of the wound healing process in humans as malnutrition has been well-documented to impede wound healing; however, this has not been evaluated in disbudding wounds in calves. Although it is …
View article: A focus group study exploring dairy farmers’ perspectives of cull cow management in Ontario, Canada
A focus group study exploring dairy farmers’ perspectives of cull cow management in Ontario, Canada Open
Introduction Maintaining the welfare of cull dairy cows from the farm to slaughter is an ongoing challenge for the dairy industry. Recent research suggests that some cull dairy cows within the marketing system are in physical states that a…
View article: Supplementary Tables
Supplementary Tables Open
Table S1: Significant (P≤ 0.05) enriched Molecular Function, Cellular component, and Biological process by Fisher's test for β-hydroxybutyrate concentration at first lactation from 5 to 21 DIM (BHB1.1) Table S2: Significant (P≤ 0.05) enric…
View article: Supplementary Tables
Supplementary Tables Open
Table S1: Significant (P≤ 0.05) enriched Molecular Function, Cellular component, and Biological process by Fisher's test for β-hydroxybutyrate concentration at first lactation from 5 to 21 DIM (BHB1.1) Table S2: Significant (P≤ 0.05) enric…
View article: Supplementary Tables
Supplementary Tables Open
Table S1: Significant (P≤ 0.05) enriched Molecular Function, Cellular component, and Biological process by Fisher's test for β-hydroxybutyrate concentration at first lactation from 5 to 21 DIM (BHB1.1) Table S2: Significant (P≤ 0.05) enric…
View article: Characterizing ruminal acidosis risk: A multiherd, multicountry study
Characterizing ruminal acidosis risk: A multiherd, multicountry study Open
A multicenter observational study was conducted on early lactation Holstein cows (n = 261) from 32 herds from 3 regions (Australia, AU; California, CA; and Canada, CAN) to characterize their risk of acidosis into 3 groups (high, medium, or…
View article: Association of herd hyperketolactia prevalence with transition management practices and herd productivity on Canadian dairy farms—A retrospective cross-sectional study
Association of herd hyperketolactia prevalence with transition management practices and herd productivity on Canadian dairy farms—A retrospective cross-sectional study Open
The objective of this observational study was to assess the relationship between herd-level prevalence of hyperketolactia (HPH) with management practices of the transition period and herd milk production. Dairy herds (n = 71) were selected…
View article: Identification of genetic markers associated with clinical response of ketose treatment in Holstein cows
Identification of genetic markers associated with clinical response of ketose treatment in Holstein cows Open
Additional File 1- Table S1. Mean and standard deviations of blood BHB concentration (mmol/L) for groups of cows classified as Chronic, Cured, Recurrent, and Severe considering their responses to the administration of propylene glycol and …
View article: Identification of genetic markers associated with clinical response of ketose treatment in Holstein cows
Identification of genetic markers associated with clinical response of ketose treatment in Holstein cows Open
Additional File 1- Table S1. Mean and standard deviations of blood BHB concentration (mmol/L) for groups of cows classified as Chronic, Cured, Recurrent, and Severe considering their responses to the administration of propylene glycol and …
View article: Increased parity is negatively associated with survival and reproduction in different production systems
Increased parity is negatively associated with survival and reproduction in different production systems Open
We conducted a retrospective meta-analysis based on individual cow data to assess the associations of parity, level of production, and pasture-based or intensively fed systems with fertility. Our goal was to provide understandings of the r…
View article: A survey of practices and attitudes around cull cow management by bovine veterinarians in Ontario, Canada
A survey of practices and attitudes around cull cow management by bovine veterinarians in Ontario, Canada Open
The removal (culling) of dairy cows from the farm is a regular and required management practice. The main objectives of this study were to describe the involvement of bovine veterinarians in Ontario, Canada, in dairy cull cow management de…
View article: Associations of parity with health disorders and blood metabolite concentrations in Holstein cows in different production systems
Associations of parity with health disorders and blood metabolite concentrations in Holstein cows in different production systems Open
Data were obtained from studies in Australia, Canada, and the United States using individual cow data from 28,230 Holstein cows to evaluate associations between parity and disease. Our goal was to develop understanding of disease risks for…
View article: PSXIII-B-13 Investigation of Genetic Markers That may be Associated with Responses of Dairy Cows to Ketosis Treatment
PSXIII-B-13 Investigation of Genetic Markers That may be Associated with Responses of Dairy Cows to Ketosis Treatment Open
The objective of this study was to investigate genetic markers associated with different responses to ketosis treatment when compared to ketosis-free Holstein cows. Holstein cows (N=964) from four commercial farms, located in New York Stat…