Light from heat lamps affects sow behaviour and piglet salivary melatonin levels

Liu, Kang; Liu, Longshen; Tai, Meng; Ding, Qian; Yao, Wen; Shen, Mingxia

doi:10.1016/j.animal.2022.100534

Cited by 7 publications

(10 citation statements)

References 37 publications

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“…According to Table 9, the conception rate and litter size of sows, and piglet growth were improved when sows were exposed to ultraviolet radiation for 12 h (Khabibulov, 1976). Liu et al (2022) further found that when sows were exposed to red light, the lying behavior of sows was improved and their MT concentration was reduced, while there was no significant change in their production performance. To sum up, it can be concluded that: (1) When sows are exposed to red light, their sexual maturity is delayed and there is no significant change in their reproductive performance.…”

Section: Resultsmentioning

confidence: 99%

“…Effect of light intensity on sows Stevenson et al (2010) The litter weight of sows was increased by approximately 141 g when the light intensity was increased by 10 lx in the range of 32-266 lx Canaday et al (2013) The oestrus time of sows under the light intensity of 433 lx was longer than that of sows under the light intensity of 11 lx Diekman and Grieger (1988) There was no significant difference in the initial oestrus age of sows under the light intensity of more than 90 lx, while their initial oestrus age was delayed under the light intensity of <10 lx Griffith and Minton (1992) The cortisol concentration of sows was not significantly affected by light intensity, but the PRL concentration of sows under the light intensity of 1783 lx was higher than that of sows under the light intensity of 113 lx Tast, Love, Evans, There was no significant difference in the MT concentration of sows under the light intensity of 40, 200 and 10,000 lx Effect of light frequency on sows Wheelhouse and Hacker (1982) There was no significant difference in mean weight gain, feed conversion and ovulation rate of sows under the same light duration and four light frequencies of white light, sunlight, red light and ultraviolet light Diekman and Grieger (1988) The sexual maturity of sows was delayed, as well as their weight and pineal gland weight were heavier under the light frequency of red light Khabibulov (1976) The conception rate and litter size of sows, as well as piglet growth were improved when sows were exposed to ultraviolet radiation for 12 h Liu et al (2022) When sows were exposed to red light, the lying frequency of sows was improved and their MT concentration was reduced, while there was no significant change in their reproductive performance There were some studies on the effect of light frequency on conception rate, sexual maturity, litter size and weight of sows.…”

Section: Research Contents Literature Main Conclusionmentioning

confidence: 99%

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A review on the effect of light–thermal–humidity environment in sow houses on sow reproduction and welfare

Xie

et al. 2023

Reprod Domestic Animals

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The environment in sow houses is the key to restrict sow production due to its significant effect on sow growth and reproduction. In this article, the effect of light, thermal and light–thermal–humidity environment in sow houses is systematically reviewed for sow reproduction and welfare according to the existing literature. The results show the optimal ambient temperature range for sows is approximately 16–22°C, as well as the lowest and highest critical temperature are 16 and 27°C respectively. Meanwhile, the increase of relative humidity from 50% to 70% is equivalent to the increase of effective temperature by 0.9°C in sow houses. In addition, the evaluation indexes are summarized to the future research direction is proposed according to the reviewed results. It can be concluded that the current research mainly focuses on the effect mechanism of light–thermal–humidity environment on sow growth and reproductive performance, as well as the optimal regulation range of light–thermal–humidity environment. In particular, it is a popular topic to further study the effect of light–thermal–humidity environment on the genetic material of sows, as well as metabolic parameters and body composition of their offspring. The above conclusions can contribute to guiding the regulation of light–thermal–humidity environment in sow houses and improving the sow welfare.

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Section: Resultsmentioning

confidence: 99%

Section: Research Contents Literature Main Conclusionmentioning

confidence: 99%

A review on the effect of light–thermal–humidity environment in sow houses on sow reproduction and welfare

Xie

et al. 2023

Reprod Domestic Animals

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“…While our work focused on corticosterone, other steroid hormones and peptides could also potentially be measured in saliva of free-ranging birds, as it is already done in humans and some domestic animals [46][47][48]. In particular, previous studies showed that any unconjugated hormone enters saliva by free diffusion through the salivary gland cells, which makes their concentration independent on the salivary flow rate [49,50].…”

Section: Discussionmentioning

confidence: 99%

“…In particular, previous studies showed that any unconjugated hormone enters saliva by free diffusion through the salivary gland cells, which makes their concentration independent on the salivary flow rate [49,50]. As such, it could be possible to non-invasively monitor several other physiological parameters in saliva, such as testosterone [51], oestradiol [52], progesterone [46], oxytocin [47], or melatonin [48] for example, providing insight on the reproductive, behavioural and overall health status of wild birds.…”

Section: Discussionmentioning

confidence: 99%

Salivary corticosterone reflects plasmatic levels in a wild seabird

Carbillet

Saks

Sepp

2023

Preprint

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Wild animals have been increasingly exposed to a wide range of stressors, mainly due to the intensification of human activities and habitat modifications. Consequently, new tools in order to assess the physiological and health status of wild animals have been developed. In particular, glucocorticoids have received a special attention. Primarily metabolic hormones, they are also used to evaluate the stress level of organisms. While historically measured in blood samples, new less-invasive methods have been recently developed to measure glucocorticoids in matrices such as faeces, hairs/feathers, or saliva. To date, measurements in saliva are still in their infancy despite the numerous advantages of the matrix: non-invasive, reflects the biologically active portion of glucocorticoids, allows to measure both baseline and stress-induced levels. In addition, most studies using saliva have been performed on domestic and captive animals, and recent development in wild animals have focused on mammals. Here, we show, for the first time that saliva could also be reliably used in free-ranging birds, as glucocorticoid levels in saliva strongly correlated with plasma levels. This promising result opens new avenues for a non-invasive sampling method to assess health status of wild birds in conservation biology and ecology.

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“…Unlike other environmental parameters, such as room temperature, light has not received enough attention within pig farming. Although inadequate lighting is known to have a negative impact on the welfare of many animals in captivity [2,[16][17][18], knowledge of the consequences of different types of illuminance on pig housing is limited. In fact, the ideal illuminance level is not yet clear [19].…”

Section: Introductionmentioning

confidence: 99%

Modelling of Animal Activity, Illuminance, and Noise on a Weaned Piglet Farm

Fernández,

Besteiro,

Arango

et al. 2023

Animals

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Measuring animal activity and its evolution in real time is useful for animal welfare assessment. In addition, illuminance and noise level are two factors that can improve our understanding of animal activity. This study aims to establish relationships between animal activity as measured by passive infrared sensors, and both illuminance and noise level on a conventional weaned piglet farm. First, regression models were applied, and then cosine models with three harmonics were developed using least squares with a Generalized Reduced Gradient Nonlinear method. Finally, all the models were validated. Linear models showed positive correlations, with values between 0.40 and 0.56. Cosine models drew clear patterns of daily animal activity, illuminance and noise level with two peaks, one in the morning and one in the afternoon, coinciding with human activity inside the building, with a preference for inactivity at night-time and around midday. Cosine model fitting revealed strong correlations, both in the measurement and validation periods, for animal activity (R = 0.97 and 0.92), illuminance (R = 0.95 and 0.91) and noise level (R = 0.99 and 0.92). The developed models could be easily implemented in animal welfare monitoring systems and could provide useful information about animal activity through continuous monitoring of illuminance or noise levels.

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Light from heat lamps affects sow behaviour and piglet salivary melatonin levels

Cited by 7 publications

References 37 publications

A review on the effect of light–thermal–humidity environment in sow houses on sow reproduction and welfare

A review on the effect of light–thermal–humidity environment in sow houses on sow reproduction and welfare

Salivary corticosterone reflects plasmatic levels in a wild seabird

Modelling of Animal Activity, Illuminance, and Noise on a Weaned Piglet Farm

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