Article
Agriculture, Dairy & Animal Science
Luigi Iannetti, Sara Romagnoli, Giuseppe Cotturone, Michele Podaliri Vulpiani
Summary: The study found that there was no significant difference in overall welfare score between broiler batches raised with and without antibiotics. While the good-feeding principle was better in conventional batches, good health and appropriate behavior were slightly better in antibiotic-free batches.
Article
Agriculture, Dairy & Animal Science
Leonie Jacobs, Shawnna Melick, Nathan Freeman, An Garmyn, Frank A. M. Tuyttens
Summary: This study investigated the impact of novel flooring treatments on broiler chicken behavioral repertoire, finding that clean friable litter led to increased drinking, foraging, preening, and overall activity compared to partially slatted flooring and disinfectant mats. Access to clean, regularly replaced litter was beneficial for broiler chicken welfare in enabling them to express their normal behavioral repertoire.
Article
Agriculture, Dairy & Animal Science
S. M. Abeyesinghe, N. M. Chancellor, D. Hernandez Moore, Y. -M. Chang, J. Pearce, T. Demmers, C. J. Nicol
Summary: Broiler chickens are prone to various health and welfare issues, with behaviour showing strong associations with health indicators. Better growth and feed efficiency were observed in conventional broilers, while specific behaviours were identified as indicators of good or poor health outcomes. These behavioural measures not only reflect health status but also provide insights into motivational and affective aspects of welfare, suggesting the importance of incorporating behaviour into broiler welfare assessments.
Article
Multidisciplinary Sciences
Iris Chan, Becca Franks, Matthew N. Hayek
Summary: With the increase in demand for chicken, concerns about welfare and environmental impact are also rising. People are turning to raising chickens on pasture and using slower-growing, higher-welfare breeds. However, switching to alternative breeds will lead to a significant increase in the number of chickens slaughtered each year, higher land use, and a potential decrease in overall chicken welfare.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Agriculture, Dairy & Animal Science
Erica Pereira, Irenilza de Alencar Naas, Andre Henrique Ivale, Rodrigo Garofallo Garcia, Nilsa Duarte da Silva Lima, Danilo Florentino Pereira
Summary: The objective of this study was to investigate chick vocalization during social isolation and different flock sizes. The results showed that chicks emitted different sounds and expended varying amounts of energy depending on their isolation or group status and the size of the flock. The most accurate classifier to predict flock density was found to be the Random Forest model.
Article
Agriculture, Dairy & Animal Science
Sabine G. Gebhardt-Henrich, Ariane Stratmann, Marian Stamp Dawkins
Summary: Technology on farms can improve animal welfare and productivity while reducing disease and environmental impact. Camera technology can provide continuous monitoring of welfare for whole flocks and individual birds, showing variation and abnormal movement. Patterns of optical flow at the flock level can provide valuable information about individual behavior, correlating with welfare measures and activity levels.
Article
Agriculture, Dairy & Animal Science
Peter Sandoe, Henning Otte Hansen, Bjorn Forkman, Peter van Horne, Hans Houe, Ingrid C. de Jong, Jorgen B. Kjaer, Soren Saxmose Nielsen, Clare Palmer, Helle Lottrup Halkjaer Rhode, Tove Christensen
Summary: There are two types of initiatives to ensure welfare in broiler production: welfare legislation and market driven initiatives. Sweden has higher legal standards, while market driven initiatives complement more welfare-limited Dutch legislation, improving broiler welfare.
Article
Agriculture, Dairy & Animal Science
Ingrid C. de Jong, Bram Bos, Jan van Harn, Pim Mostert, Dennis te Beest
Summary: This study compared the welfare performance and the between-flock variation in welfare of 3 Dutch commercial broiler production systems with different welfare requirements. The results showed that increasing welfare requirements led to higher total welfare scores across production systems. There were large variations and overlaps in the scores of different welfare measures and the overall flock welfare score.
Article
Immunology
David M. Berendes, Kirsten Fagerli, Sunkyung Kim, Dilruba Nasrin, Helen Powell, Irene N. Kasumba, Sharon M. Tennant, Anna Roose, M. Jahangir Hossain, Joquina Chiquita M. Jones, Syed M. A. Zaman, Richard Omore, John B. Ochieng, Jennifer R. Verani, Marc-Alain Widdowson, Samba O. Sow, Sanogo Doh, Ciara E. Sugerman, Eric D. Mintz, Karen L. Kotloff
Summary: In this case-control study, we found associations between unsafe water sources, unsafely managed sanitation, and animal contact with moderate-to-severe diarrhea in children. The results showed that children with drinking water sources below safety standards had a higher risk of diarrhea, while the relationship between sanitation and animals varied by site.
CLINICAL INFECTIOUS DISEASES
(2023)
Article
Agriculture, Dairy & Animal Science
Elizabeth Rowe, Siobhan Mullan
Summary: A good life for farmed animals is achieved by providing valued resources and positive physical and mental experiences. Evaluating resource provision is crucial for assessing positive welfare for farm animals.
Article
Agriculture, Dairy & Animal Science
Chelsea E. Course, Patrick Boerlin, Durda Slavic, Jean-Pierre Vaillancourt, Michele T. Guerin
Summary: Salmonella enterica and Escherichia coli levels in commercial broiler chicken barns can be reduced through appropriate sanitation procedures, with dry cleaning being preferable for enterica control and disinfection being preferable for E. coli reduction. Factors such as the type of flooring, season, and timing of sample collection can impact the presence and concentration of these bacteria.
Article
Agriculture, Multidisciplinary
Luuk S. M. Vissers, Alfons G. J. M. Oude Lansink, Helmut W. Saatkamp
Summary: This paper aimed to explore combinations of system changes that perform best in terms of farm income, animal welfare, emissions of ammonia (NH3) and particulate matter (PM10) and are robust to changes in society's expectations relating to animal welfare and environmental sustainability.
AGRICULTURAL SYSTEMS
(2021)
Article
Green & Sustainable Science & Technology
Kirsi Usva, Sanna Hietala, Jouni Nousiainen, Virpi Vorne, Marja-Liisa Vieraankivi, Marja Jallinoja, Ilkka Leinonen
Summary: The production and consumption of poultry meat is increasing in Finland, but there is a lack of updated information on the climate change impact of broiler production and no previous study on its water scarcity impact. This study used the Life Cycle Assessment methodology to quantify the climate change and water scarcity impacts of Finnish broiler chicken meat, and applied the AWARE method for the first time in broiler chicken production. The results showed that the feed chain played a significant role in both the climate change and water scarcity impacts.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Veterinary Sciences
Ana Paula O. Souza, Frank A. M. Tuyttens, Cesar A. Taconeli, Jennifer C. Biscarra, Carla F. M. Molento
Summary: The study found that using Visual Analogue Scale (VAS) and Ordinal Rate Scale (ORS) to assess welfare indicators in broiler chickens is reliable. VAS showed better performance in terms of inter-rater reliability and correlations among the four indicators compared to ORS.
JOURNAL OF APPLIED ANIMAL WELFARE SCIENCE
(2022)
Review
Agronomy
Nikola Puvaca, Vincenzo Tufarelli, Ilias Giannenas
Summary: The use of essential oils as a substitute for antibiotic growth promoters in animal nutrition, specifically in broiler nutrition, has gained attention. The efficacy of essential oils varies depending on factors such as dietary composition, feed inclusion level, and bird genetics. Despite limited information on the effects of essential oils on nutrient digestibility, gut function, and the immune system, research supports their potential use as natural growth promoters for broilers.
Article
Agriculture, Dairy & Animal Science
Anneleen Watteyn, Leonie Jacobs, Bart Ampe, Christel P. H. Moons, An Garmyn, Frank A. M. Tuyttens
Article
Agriculture, Dairy & Animal Science
R. S. Boyal, R. J. Buhr, C. E. Harris, L. Jacobs, D. Bourassa
JOURNAL OF APPLIED POULTRY RESEARCH
(2020)
Article
Agriculture, Dairy & Animal Science
Evelien Lambrecht, Leonie Jacobs, Evelyne Delezie, Hans De Steur, Xavier Gellynck, Frank Tuyttens
WORLDS POULTRY SCIENCE JOURNAL
(2020)
Article
Agriculture, Dairy & Animal Science
Nathan Freeman, Frank A. M. Tuyttens, Alexa Johnson, Victoria Marshall, An Garmyn, Leonie Jacobs
Article
Agriculture, Dairy & Animal Science
Leonie Jacobs, Dianna Bourassa, Ranjit S. Boyal, Caitlin E. Harris, L. Nicole Bartenfeld Josselson, Andrew Campbell, Gracie Anderson, R. Jeff Buhr
Summary: Based on a comparison of four methods, electric euthanasia was found to be the most humane, consistently resulting in quick loss of consciousness within 15 seconds, no returning reflexes, and no torn skin or blood loss.
Article
Multidisciplinary Sciences
M. G. Anderson, A. M. Campbell, A. Crump, G. Arnott, L. Jacobs
Summary: Affective state can influence an animal's judgement, with animals in positive states showing more optimistic interpretations of ambiguous cues. This study found that broiler chickens in high-complexity environments displayed a more optimistic judgement bias, indicating that environmental complexity can improve their affective states. Additionally, birds in higher stocking density pens tended to approach all cues faster, possibly due to increased food motivation from resource competition.
SCIENTIFIC REPORTS
(2021)
Article
Agriculture, Dairy & Animal Science
Aska Ujita, Zachary Seekford, Michelle Kott, Guillermo Goncherenko, Nicholas W. Dias, Erica Feuerbacher, Luciana Bergamasco, Leonie Jacobs, Dan E. Eversole, Joao A. Negrao, Vitor R. G. Mercadante
Summary: By applying different human-animal habituation strategies to beef heifers, such as positive tactile stimulation and passage through the working chute, it was found that these strategies have the potential to improve behavior and decrease physiological stress responses in cattle, leading to enhanced safety during interactions with humans.
Article
Agriculture, Dairy & Animal Science
Mallory G. Anderson, Andrew M. Campbell, Andrew Crump, Gareth Arnott, Ruth C. Newberry, Leonie Jacobs
Summary: The study found that broilers raised under high stocking density conditions at 3 weeks of age were less fearful than those under low density conditions, and that living in a complex environment reduced anxiety and improved welfare for the broilers.
Article
Agriculture, Dairy & Animal Science
Leonie Jacobs, Shawnna Melick, Nathan Freeman, An Garmyn, Frank A. M. Tuyttens
Summary: This study investigated the impact of novel flooring treatments on broiler chicken behavioral repertoire, finding that clean friable litter led to increased drinking, foraging, preening, and overall activity compared to partially slatted flooring and disinfectant mats. Access to clean, regularly replaced litter was beneficial for broiler chicken welfare in enabling them to express their normal behavioral repertoire.
Article
Behavioral Sciences
M. G. Anderson, A. M. Campbell, D. D. Kuhn, S. A. Smith, L. Jacobs
Summary: Environmental conditions, such as complexity and stocking density, have an impact on animal emotion and affective state. This study investigated the effects of environmental complexity and stocking density on the affective state of rainbow trout. The results showed that fish housed in high-density tanks entered all chambers faster and exhibited more optimism for receiving a feed reward compared to fish in low-density tanks. Tank complexity did not affect the test outcomes.
Article
Agriculture, Dairy & Animal Science
Andrew M. Campbell, Alexa M. Johnson, Michael E. Persia, Leonie Jacobs
Summary: This study compared the impacts of conventional cages and enriched floor pens on Bovan brown laying hens and found that caged birds showed increased stress, reduced immune function, and increased fear compared to birds in pens. However, caged hens showed lower anxiety levels. These findings indicate that conventional cages generally have negative effects on animal welfare.
Article
Agriculture, Dairy & Animal Science
R. S. Boyal, R. J. Buhr, C. E. Harris, L. Jacobs, D. V. Bourassa
Summary: This study evaluated the efficacy of different euthanasia methods for large and mature poultry. The results showed that the Koechner Euthanizing Device (KED) and Turkey Euthanasia Device (TED) had longer reflex and movement durations. TED resulted in the highest levels of skin damage and blood loss. There were no significant differences in kill success rates and time to cessation of heartbeat among the different methods.
Article
Agriculture, Dairy & Animal Science
L. Jacobs, R. A. Blatchford, I. C. De Jong, M. A. Erasmus, M. Levengood, R. C. Newberry, P. Regmi, A. B. Riber, S. L. Weimer
Summary: This paper discusses the impact of environmental enrichment on poultry welfare through four themes and emphasizes the importance of considering enrichment strategies from the birds' perspective. It also suggests methods for improving play behavior and activity levels. Although previous research has shown that environmental complexity can increase poultry activity levels and behavior, more studies are needed on birds' resilience, the effects in commercial conditions, and slower-growing strains.
Article
Multidisciplinary Sciences
Bidur Paneru, Gabriel J. Pent, Shawna Nastasi, Adam K. Downing, John F. Munsell, John H. Fike, Leonie Jacobs
Summary: This study aimed to examine the effects of silvopasture and open pasture systems on fearfulness and leg health in fast-growing broiler chickens. The results showed that birds in the silvopasture system were less fearful and had better leg health compared to those in the open pasture system. This indicates that silvopasture systems provide some benefits for affective state and leg health in fast-growing broilers.
Article
Agriculture, Dairy & Animal Science
Mallory G. Anderson, Alexa M. Johnson, Leonie Jacobs, Ahmed B. A. Ali
Summary: Providing perches for laying hens can improve their welfare, but the effectiveness may vary depending on the age of the hens. This study investigated the effects of early and late access to perches on anxiety and fear in pullets. Continuous perch access reduced anxiety and fear compared to no perch access. Adding or removing perches before the laying phase increased fear and anxiety, but this effect disappeared by week 37 of age.
Article
Agriculture, Dairy & Animal Science
A. V. Mendoza, S. Weimer, Z. Williams
Summary: This study evaluated the effectiveness of steam as an additional method for depopulation of laying hens in a cage-free aviary system. The results showed that steam alone or in combination with heat can lead to faster mortality of hens, and the distribution of carcasses varies in different tiers.
JOURNAL OF APPLIED POULTRY RESEARCH
(2024)