Full Text Journal Articles by
Author Daniel M Weary

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Perceptions of laboratory animal facility managers regarding institutional transparency.

Michael W Brunt, Daniel M Weary,

Institutions that conduct animal research are often obliged to release some information under various legal or regulatory frameworks. However, within an institution, perspectives on sharing information with the broader public are not well documented. Inside animal facilities, managers exist at the interface between the people who conduct animal research and ... Read more >>

PLoS One (PloS one)
[2021, 16(7):e0254279]

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Perspectives of Western Canadian dairy farmers on providing outdoor access for dairy cows.

Anne-Marieke C Smid, Pauline H J Inberg, Saskia de Jong, Shane Sinclair, Marina A G von Keyserlingk, Daniel M Weary, Herman W Barkema,

Dairy cows are highly motivated to access pasture, especially at night in summer. When pasture is not available, dairy cows show a partial preference for alternative types of outdoor access, spending half the night outside in summer on an outdoor sand or wood chip pack. However, many dairy farms do ... Read more >>

J Dairy Sci (Journal of dairy science)
[2021, :]

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Standing behavior and sole horn lesions: A prospective observational longitudinal study.

Hanna K Eriksson, Ruan R Daros, Marina A G von Keyserlingk, Daniel M Weary,

Studies performed on individual research farms have reported that dairy cattle developing sole hemorrhages or sole ulcers in peak to mid lactation spent more time standing during the weeks around calving. The aim of this prospective observational longitudinal study was to evaluate whether this relationship is evident in commercial dairy ... Read more >>

J Dairy Sci (Journal of dairy science)
[2021, :]

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The Freestall Reimagined: Effects on Stall Hygiene and Space Usage in Dairy Cattle.

Annabelle Beaver, Emma Strazhnik, Marina A G von Keyserlingk, Daniel M Weary,

Modern freestall barns for dairy cattle have been constructed with considerations for dairy cow cleanliness; partitions and other stall features such as neck rails are designed to reduce manure contamination of bedding and decrease farm labor. However, cows prefer to lie in more open spaces, including on bedded packs and ... Read more >>

Animals (Basel) (Animals : an open access journal from MDPI)
[2021, 11(6):]

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Attitudes of laboratory animal professionals and researchers towards carbon dioxide euthanasia for rodents and perceived barriers to change.

Michael W Brunt, Lucia Améndola, Daniel M Weary,

Evidence indicates that carbon dioxide (CO<sub>2</sub>) induces negative affective states (including anxiety, fear and distress) in laboratory rodents, but many countries still accept it for euthanasia. Alternative methods (e.g. inhalant anaesthetic) may represent a refinement over CO<sub>2</sub> but are not widely adopted. We conducted an online survey of Canadian and ... Read more >>

Lab Anim (Laboratory animals)
[2021, :236772211025166]

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Invited review: The welfare of dairy cattle housed in tiestalls compared to less-restrictive housing types: A systematic review.

Annabelle Beaver, Daniel M Weary, Marina A G von Keyserlingk,

Many dairy cattle worldwide are housed in tiestalls, meaning that they are tethered by the neck to individual stalls. On some farms, tied cattle are permitted seasonal access to pasture, but otherwise their movements are restricted compared with cows housed in freestall barns or other loose housing systems. The aim ... Read more >>

J Dairy Sci (Journal of dairy science)
[2021, :]

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Corrigendum to "Addition of straw to the early-lactation diet: Effects on feed intake, milk yield, and subclinical ketosis in Holstein cows" (J. Dairy Sci. 104:3008-3017).

Hesam A Seifi, Julianna M Huzzey, M A Khan, Daniel M Weary, Marina A G von Keyserlingk,

J Dairy Sci (Journal of dairy science)
[2021, 104(6):7343]

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A break from the pups: The effects of loft access on the welfare of lactating laboratory rats.

Anna S Ratuski, Daniel M Weary,

Rats (Rattus norvegicus) bred for research are typically confined with their litters until weaning, but will spend time away from pups when given the opportunity. We aimed to assess how dam welfare is affected by the ability to escape from their pups. Rat dams (n = 16) were housed in ... Read more >>

PLoS One (PloS one)
[2021, 16(6):e0253020]

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Public attitudes toward dairy farm practices and technology related to milk production.

Lexis H Ly, Erin B Ryan, Daniel M Weary,

Dairy farm systems have intensified to meet growing demands for animal products, but public opposition to this intensification has also grown due, in part, to concerns about animal welfare. One approach to addressing challenges in agricultural systems has been through the addition of new technologies, including genetic modification. Previous studies ... Read more >>

PLoS One (PloS one)
[2021, 16(4):e0250850]

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Views of American animal and dairy science students on the future of dairy farms and public expectations for dairy cattle care: A focus group study.

Caroline Ritter, Elizabeth R Russell, Daniel M Weary, Marina A G von Keyserlingk,

Students completing advanced degrees in dairy or animal science may go on to have a major impact on the food animal agriculture industries. The aim of this study was to better understand student views of the future of dairying, including changes in practices affecting animal care on farms as well ... Read more >>

J Dairy Sci (Journal of dairy science)
[2021, 104(7):7984-7995]

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Employee Management and Animal Care: A Comparative Ethnography of Two Large-Scale Dairy Farms in China.

Maria Chen, Marina A G von Keyserlingk, Sabina Magliocco, Daniel M Weary,

Farm management can directly and indirectly affect animal care. We explored how farm management affected animal care on two large dairy farms in China (anonymized as Farm A and Farm B). We used a mini-ethnographic case study design whereby the first author lived for 38 days on Farm A and ... Read more >>

Animals (Basel) (Animals : an open access journal from MDPI)
[2021, 11(5):]

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Captivity-Induced Depression in Animals.

Benjamin Lecorps, Daniel M Weary, Marina A G von Keyserlingk,

Concern over the welfare of captive animals is growing. Captivity is often associated with frequent exposure to stressors, which may be the source of persistent negative affective states. We argue that captivity may lead to depressive-like states and call for more research on this topic. ... Read more >>

Trends Cogn Sci (Trends in cognitive sciences)
[2021, 25(7):539-541]

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Facial expression in humans as a measure of empathy towards farm animals in pain.

Lexis H Ly, Daniel M Weary,

People often express concern for the welfare of farm animals, but research on this topic has relied upon self-report. Facial expressions provide a quantifiable measure of emotional response that may be less susceptible to social desirability bias and other issues associated with self-report. Viewing other humans in pain elicits facial ... Read more >>

PLoS One (PloS one)
[2021, 16(3):e0247808]

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Addition of straw to the early-lactation diet: Effects on feed intake, milk yield, and subclinical ketosis in Holstein cows.

Hesam A Seifi, Julianna M Huzzey, M A Khan, Daniel M Weary, Marina A G von Keyserlingk,

This study evaluated feed intake, milk yield, and subclinical ketosis in dairy cows in early lactation fed 2 different diets postpartum. Cows are typically offered a high-energy ration immediately after calving. We compared a conventional high-energy total mixed ration (TMR) with a transition ration that contained chopped straw. We predicted ... Read more >>

J Dairy Sci (Journal of dairy science)
[2021, 104(3):3008-3017]

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Individual differences in rat sensitivity to CO2.

Lucía Améndola, Anna Ratuski, Daniel M Weary,

Feelings of fear, anxiety, dyspnea and panic when inhaling carbon dioxide (CO2) are variable among humans, in part due to differences in CO2 sensitivity. Rat aversion to CO2 consistently varies between individuals; this variation in aversion may reflect CO2 sensitivity, but other personality traits could also account for individual differences ... Read more >>

PLoS One (PloS one)
[2021, 16(1):e0245347]

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Pessimistic dairy calves are more vulnerable to pain-induced anhedonia.

Benjamin Lecorps, Emeline Nogues, Marina A G von Keyserlingk, Daniel M Weary,

Pain induces deficits in appreciation of rewards (i.e. anhedonia) and variation in response to pain may be partly explained by individual differences in general expectations (i.e. optimism). Dairy calves are routinely subjected to painful procedures such as hot-iron disbudding. We tested if female Holstein calves (n = 17) display signs ... Read more >>

PLoS One (PloS one)
[2020, 15(11):e0242100]

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The effects of social environment on standing behavior and the development of claw horn lesions.

Hanna K Eriksson, Marina A G von Keyserlingk, Daniel M Weary,

The primary aim of this prospective experimental study was to evaluate how the social environment after calving influenced standing behavior in primiparous cows. At calving, primiparous cows were mixed with familiar peers in a low-stocked pen (≤33% stocking density; n = 22) or mixed with unknown older cows at 100% ... Read more >>

J Dairy Sci (Journal of dairy science)
[2021, 104(2):2195-2211]

Cited: 1 time

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Conditioned place aversion of caustic paste and hot-iron disbudding in dairy calves.

Thomas Ede, Marina A G von Keyserlingk, Daniel M Weary,

Cauterization by hot iron and application of caustic paste are 2 common methods of disbudding calves. In this study, we compared the affective experience of these 2 procedures on young dairy calves using conditioned place aversion. Male dairy calves (n = 14; 7 ± 2 d old) were disbudded by ... Read more >>

J Dairy Sci (Journal of dairy science)
[2020, 103(12):11653-11658]

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Graduate Student Literature Review: Challenges and opportunities for human resource management on dairy farms.

Katelyn E Mills, Daniel M Weary, Marina A G von Keyserlingk,

Dairy farms are increasing in size and moving from family to external labor. As such, dairy farmers now have the responsibilities of a human resource manager in addition to caring for their animals. The objective of this paper was to review literature in 5 areas of human resource management of ... Read more >>

J Dairy Sci (Journal of dairy science)
[2021, 104(1):1192-1202]

Cited: 1 time

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Perspectives of western Canadian dairy farmers on the future of farming.

Caroline Ritter, Katelyn E Mills, Daniel M Weary, Marina A G von Keyserlingk,

Similar to the situation in many countries, the dairy industry in Canada is challenged by the need to adapt to changing societal demands. An industry-led initiative (Dairy Farmers of Canada's proAction Initative, known as proAction) was developed to respond to this challenge, providing mandatory national standards for on-farm practices. Farmers ... Read more >>

J Dairy Sci (Journal of dairy science)
[2020, 103(11):10273-10282]

Cited: 1 time

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Individual Variability in Response to Social Stress in Dairy Heifers.

Emeline Nogues, Benjamin Lecorps, Daniel M Weary, Marina A G von Keyserlingk,

Regrouping is associated with increased aggression, and disruption of time-budgets. Individuals vary in how well they cope with social stress. Our objective was to describe individual differences in agonistic behavior in dairy heifers after regrouping, and determine how time-budget and behavioral synchronization were affected by these coping strategies. A total ... Read more >>

Animals (Basel) (Animals : an open access journal from MDPI)
[2020, 10(8):]

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Dairy farmer advising in relation to the development of standard operating procedures.

Katelyn E Mills, Katherine E Koralesky, Daniel M Weary, Marina A G von Keyserlingk,

Standard operating procedures (SOP) are increasingly required on farms participating in animal welfare assurance programs, such as the Dairy Farmers of Canada's proAction initiative and the National Dairy FARM Program in the United States. However, little is known about the use of SOP on farms and who is involved in ... Read more >>

J Dairy Sci (Journal of dairy science)
[2020, 103(12):11524-11534]

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Short communication: Motivation to walk affects gait attributes.

Shabnaz Mokhtarnazif, Anne-Marieke C Smid, Daniel M Weary, Ahmadreza Mohamadnia, Marina A G von Keyserlingk,

Lameness is a major welfare problem in the dairy industry. Environmental factors, such as flooring surface, as well as cow-level factors, such as udder fill, can influence gait. The aim of the current study was to test whether motivation to walk affects gait attributes and whether this effect differs between ... Read more >>

J Dairy Sci (Journal of dairy science)
[2020, 103(10):9481-9487]

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Understanding rat emotional responses to CO2.

Lucía Améndola, Daniel M Weary,

The aim of this review is to summarize evidence regarding rat emotional experiences during carbon dioxide (CO<sub>2</sub>) exposure. The studies reviewed show that CO<sub>2</sub> exposure is aversive to rats, and that rats respond to CO<sub>2</sub> exposure with active and passive defense behaviors. Plasma corticosterone and bradycardia increased in rats exposed ... Read more >>

Transl Psychiatry (Translational psychiatry)
[2020, 10(1):253]

Cited: 3 times

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Competition Strategies of Metritic and Healthy Transition Cows.

Borbala Foris, Marina A G von Keyserlingk, Daniel M Weary,

Our study aimed to characterize social competition strategies in transition cows, and determine how these varied with health status. We retrospectively followed 52 cows during 3 periods (PRE: d -6 to -1 prepartum, POST1: d 1 to 3 postpartum, POST2: d 4 to 6 postpartum). Cows diagnosed with metritis on ... Read more >>

Animals (Basel) (Animals : an open access journal from MDPI)
[2020, 10(5):]

Cited: 2 times

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