Can UV light induce movement in cage-free laying hens?

Mendoza, A.V.; Weimer, Shawna L.; Williams, Z.

doi:10.1016/j.japr.2023.100350

Cited by 2 publications

(2 citation statements)

References 46 publications

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“…Several studies have evaluated the behavior of chickens using video cameras, but analysis always depends on human observation. Mendoza et al [40] verified the effects of UV light on the behavior of laying hens at 1 min intervals for 6 min before and 6 min after application of light treatments. Geng et al [41] evaluated the effects of light on circadian rhythmic behavior by positioning two observers on a walkway out of the hens' field of vision so as not to affect the birds' normal activities.…”

Section: Discussionmentioning

confidence: 95%

Assessment of Preference Behavior of Layer Hens under Different Light Colors and Temperature Environments in Long-Time Footage Using a Computer Vision System

Kodaira

Siriani

Medeiros

et al. 2023

Animals

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As for all birds, the behavior of chickens is largely determined by environmental conditions. In many production systems, light intensity is low and red feather strains have low contrast with the background, making it impossible to use conventional image segmentation techniques. On the other hand, studies of chicken behavior, even when using video camera resources, depend on human vision to extract the information of interest; and in this case, reduced samples are observed, due to the high cost of time and energy. Our work combined the use of advanced object detection techniques using YOLO v4 architecture to locate chickens in low-quality videos, and we automatically extracted information on the location of birds in more than 648 h of footage. We develop an automated system that allows the chickens to transition among three environments with different illuminations equipped with video cameras to monitor the presence of birds in each compartment, and we automatically count the number of birds in each compartment and determine their preference. Our chicken detection algorithm shows a mean average precision of 99.9%, and a manual inspection of the results showed an accuracy of 98.8%. Behavioral analysis results based on bird unrest index and permanence time indicate that chickens tend to prefer white light and disfavor green light, except in the presence of heat stress when no clear preference can be observed. This study demonstrates the potential of using computer vision techniques with low-resolution, low-cost cameras to monitor chickens in low-light conditions.

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Section: Discussionmentioning

confidence: 95%

Assessment of Preference Behavior of Layer Hens under Different Light Colors and Temperature Environments in Long-Time Footage Using a Computer Vision System

Kodaira

Siriani

Medeiros

et al. 2023

Animals

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“…Additionally, it is important to consider that birds possess tetrachromatic vision, meaning they have four types of photoreceptors enabling them to detect blue, green, and red light, and shorter wavelengths (100–400 nanometers), such as ultraviolet light [ 95 ]. This means that these animals not only have better color acuity but also can identify wavelengths invisible to humans [ 96 ].…”

Section: The Relationship Of the Physical Environment To Crowdingmentioning

confidence: 99%

Laying Hens: Why Smothering and Not Surviving?—A Literature Review

Mazocco,

de Castro Júnior,

Silveira

et al. 2024

Animals

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The proliferation of rearing systems providing opportunities for birds to engage in natural behaviors can trigger behavioral repertoires that when not manageable compromise animal welfare and the economic viability of the flock. Smothering in laying hens has long been perceived as “natural” or the result of hysteria among birds in the flock. However, the current literature has recognized smothering as an abnormal outcome with the potential to result in significant losses in cage-free poultry systems. Recent studies have specifically aimed to categorize the organization of smothering behavior and highlight its potential causes and consequences. In this study, literature review and bibliographic mapping, drawing on published articles and engagement with poultry farmers through extension and rural technical assistance, were employed. The findings indicate that smothering is a behavior triggered by factors related to the environment in which the laying hens are kept. This study concludes that there is a critical need for more rigorous and detailed research to elucidate the nuances of avian behavioral physiology and assess the impact of production systems on animal welfare and the economic impacts on the flock. This research contributes to a deeper understanding of bird behavior in high-production environments and provides practical insights for the poultry industry.

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Can UV light induce movement in cage-free laying hens?

Cited by 2 publications

References 46 publications

Assessment of Preference Behavior of Layer Hens under Different Light Colors and Temperature Environments in Long-Time Footage Using a Computer Vision System

Assessment of Preference Behavior of Layer Hens under Different Light Colors and Temperature Environments in Long-Time Footage Using a Computer Vision System

Laying Hens: Why Smothering and Not Surviving?—A Literature Review

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