Blue light from light-emitting diodes directed at a single eye elicits a dose-dependent suppression of melatonin in horses

Walsh, Ciara; Prendergast, Ralph L.; Sheridan, John T.; Murphy, Barbara A.

doi:10.1016/j.tvjl.2012.09.003

Cited by 39 publications

(34 citation statements)

References 23 publications

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“…Walsh et al . determined blue light was indeed associated with melatonin expression in horses28. Goat reproductive traits are the result of the combined effects of multiple organ, such as, the above-mentioned photoreceptor uniquely positioned to eye, pituitary and even olfactory.…”

Section: Discussionmentioning

confidence: 89%

Scanning of selection signature provides a glimpse into important economic traits in goats (Capra hircus)

Guan

Luo

Tan³

et al. 2016

Sci Rep

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Goats (Capra hircus) are one of the oldest livestock domesticated species, and have been used for their milk, meat, hair and skins over much of the world. Detection of selection footprints in genomic regions can provide potential insights for understanding the genetic mechanism of specific phenotypic traits and better guide in animal breeding. The study presented here has generated 192.747G raw data and identified more than 5.03 million single-nucleotide polymorphisms (SNPs) and 334,151 Indels (insertions and deletions). In addition, we identified 155 and 294 candidate regions harboring 86 and 97 genes based on allele frequency differences in Dazu black goats (DBG) and Inner Mongolia cashmere goats (IMCG), respectively. Populations differentiation reflected by Fst values detected 368 putative selective sweep regions including 164 genes. The top 1% regions of both low heterozygosity and high genetic differentiation contained 239 (135 genes) and 176 (106 genes) candidate regions in DBG and IMCG, respectively. These genes were related to reproductive and productive traits, such as “neurohypophyseal hormone activity” and “adipocytokine signaling pathway”. These findings may be conducive to molecular breeding and the long-term preservation of the valuable genetic resources for this species.

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Section: Discussionmentioning

confidence: 89%

Scanning of selection signature provides a glimpse into important economic traits in goats (Capra hircus)

Guan

Luo

Tan³

et al. 2016

Sci Rep

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“…It was suggested that changes in body composition may occur as a result of strengthened circadian rhythmicity of peripheral clocks and better internal synchronization that were the result of the abundance of (blue) light during daytime (Murphy & O'Brien, ). Moreover, in recent years, it has been demonstrated that blue light is the essential signal for entrainment of circadian rhythm in mares (Murphy et al, ; Nolan et al, ; Walsh et al, , ). Manipulation of the photoperiod using artificial blue light results in an earlier onset of cyclicity in the spring, reduced duration of pregnancy, increased birthweight of foals and changes in hair coat at birth (Murphy et al, ; Nolan et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…In recent studies on the impact of circadian rhythm on athletic performance in racehorses, researchers reported that both the quantity and quality of light during the natural daytime has a significant impact on the body composition and on the circadian clock gene expression in horses in training (Murphy & O'Brien, 2018 (Murphy & O'Brien, 2018). Moreover, in recent years, it has been demonstrated that blue light is the essential signal for entrainment of circadian rhythm in mares Nolan et al, 2017;Walsh et al, 2013Walsh et al, , 2014. Manipulation of the photoperiod using artificial blue light results in an earlier onset of cyclicity in the spring, reduced duration of pregnancy, increased birthweight of foals and changes in hair coat at birth Nolan et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…However, in all the aforementioned studies, there was no control group to measure the effect of ambient temperature under similar conditions of photoperiod, nutrition and/ or management system. Therefore, it cannot be excluded that the presumed effect of temperature in these studies was biased by other climatic changes, such as the intensity of daylight (more sunny days during a warm spring) and quantity and quality of available food (increased growth of grass during warm spring) (Carnevale et al, 1997;Walsh, Prendergast, Sheridan, & Murphy, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Effect of environmental factors and changes in the body condition score on the onset of the breeding season in mares

Dini

Ducheyne

Lemahieu

et al. 2019

Reprod Domestic Animals

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Several methods have been proposed to advance the onset of the breeding season in horses. Most of them are based on the exposure to an artificial lighting period combined with hormonal treatments. Mares exposed to an artificial photoperiod are most often housed indoors where the ambient temperature is often higher than the outside temperature. Mares held in barns are also exposed to different daylight intensities than horses kept outside, depending on the architecture. In the current study, we evaluated the impact of ambient temperature, daylight intensity and changes in body condition score (BCS) on the timing of first ovulation after winter anestrus in mares exposed to an artificial photoperiod. Mares (n = 211) were housed in barns with different ambient temperature and daylight exposure but with the same artificial photoperiod exposure (except for a natural photoperiod control group). Artificial photoperiod as well as an increase in BCS over the winter significantly advanced the first spring ovulation. The BCS at the start and end of the anestrus period did not have an effect on the interval to first ovulation and neither did the modest increase in ambient temperature in the barn. However, a higher light intensity during the daytime significantly advanced the first spring ovulation. The results of this study suggest that exposure to more sunlight advances the onset of the breeding season. This effect is likely mediated through the biological effect of short wavelength blue light and its impact on melatonin suppression and biological rhythms. We suggest that greater/direct exposure to the blue light component of daylight improves the response to the artificial photoperiod. The results of the present study can further assist to optimize the conditions that lead to an efficient spring transition of breeding mares.

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“…In this manner, fashion guided function. However, recently published research has found that blue light administered to animals for melatonin suppression was as effective when administered in one eye versus two eyes [25]. Such a parameter invites new usage scenarios for SAD management, and can be leveraged in both the fascinator hat and the glasses.…”

Section: Fascinator Hatmentioning

confidence: 99%

Lightwear

Profita

Roseway

Czerwinski

2015

Proceedings of the Ninth International Conference on Tangible, Embedded, and Embodied Interaction

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We present "Lightwear", a series of garment-based, lightweight, light-emitting wearables designed to administer light therapy for on-the-go treatment of Seasonal Affective Disorder (SAD). Bright Light Therapy (BLT) has been used to treat SAD for more than 25 years. While light boxes continue to serve as the predominant method of treatment, it often requires a user to sit at a dedicated location for a sustained period of time (30-60 minutes), rendering therapy inconvenient and resulting in unsatisfactory compliance rates. To date, there have been few successful products developed for wearability and portability to ease the uncomfortable nature of light box treatment. However, new low-profile, light-emitting sources yield opportunities for less cumbersome textile integration and wearability. We explore the integration of light into textile substrates that focus on fashion-forward wearables which can, in turn, address BLT efficacy, usability, and convenience.

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Blue light from light-emitting diodes directed at a single eye elicits a dose-dependent suppression of melatonin in horses

Cited by 39 publications

References 23 publications

Scanning of selection signature provides a glimpse into important economic traits in goats (Capra hircus)

Scanning of selection signature provides a glimpse into important economic traits in goats (Capra hircus)

Effect of environmental factors and changes in the body condition score on the onset of the breeding season in mares

Lightwear

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