Thermoregulation of female Aardi goats exposed to environmental heat stress in Saudi Arabia

Al-Samawi, K. A.; Al-Hassan, M. J.; Swelum, Ayman A.

doi:10.5958/0976-0555.2014.00453.1

Cited by 24 publications

(23 citation statements)

References 17 publications

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“…These non-linear effects of increased temperature on HPA axis activity can explain apparently divergent experimental results of the effects of seasons, depending on the range of temperatures encountered at each experimental location. High ambient temperatures and high solar radiation may be responsible for the highest cortisol levels observed during summer in our experiments, similar to findings of Al-Samawi et al (2014) in Saudi Arabia (38.5°C), as compared with the low levels measured in summer by Al-Busaidi et al (2008) in Oman (34°C) and by Meza-Herrera et al (2007) in Northern Mexico (26.1°C). Indeed, the increase in rectal temperature during the hot season indicates that animals were subjected to heat stress (Minka and Ayo, 2012;Al-Samawi et al, 2014).…”

Section: Adaptation To Heat Reducessupporting

confidence: 90%

“…High ambient temperatures and high solar radiation may be responsible for the highest cortisol levels observed during summer in our experiments, similar to findings of Al-Samawi et al (2014) in Saudi Arabia (38.5°C), as compared with the low levels measured in summer by Al-Busaidi et al (2008) in Oman (34°C) and by Meza-Herrera et al (2007) in Northern Mexico (26.1°C). Indeed, the increase in rectal temperature during the hot season indicates that animals were subjected to heat stress (Minka and Ayo, 2012;Al-Samawi et al, 2014). The seasonal rhythm in BW coincides with reproductive activity; indeed, the gain was observed when bucks were reproductively inactive, between March and mid-August, and the loss during the breeding season, which occurs between late summer and late autumn (Amirat et al, 2001;Kumar et al, 2014).…”

Section: Adaptation To Heat Reducessupporting

confidence: 90%

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Seasonal effects on plasma cortisol concentrations in the Bedouin buck: circadian studies and response to ACTH

Chergui¹,

Mormède²,

Foury³

et al. 2017

Animal

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Our work aims at the exploration of cortisol secretion in the Bedouin goat, native to the Algerian Sahara desert, to understand the mechanisms of adaptation to extreme hot climates. In the present study, diurnal and seasonal variations of cortisol concentrations were measured in basal conditions, as well as the response to ACTH stimulation tests across seasons in bucks. The plasma concentrations of cortisol showed no diurnal cycle but a large variation across seasons. The highest levels occurred in summer and winter when the environmental conditions are at their extreme levels. The rectal temperature showed nychthemeral and seasonal variations, and BW was also different across seasons with highest values in summer and lowest in winter. The results obtained after administration of two doses (2 or 10 μg/kg BW) of synthetic ACTH to three different age groups (kids, adults and elderly animals) showed a strong increase in plasma cortisol concentrations under all conditions with maximum levels achieved between 15 and 120 min. The analysis of the area under the cortisol curve showed no significant difference between the responses to the two doses of ACTH and between age groups, but showed seasonal variations with the lowest response in autumn than in other seasons. We conclude that season significantly affects secretion of cortisol in both basal state and under ACTH stimulation. However, the variation of adrenal reactivity to ACTH is not sufficient to explain seasonal differences, and in particular the summer peak in basal circulating cortisol concentrations. Further research should focus on the respective contribution of environmental factors (such as day length, temperature, humidity) and the mechanisms involved in cortisol regulation.

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Section: Adaptation To Heat Reducessupporting

confidence: 90%

Section: Adaptation To Heat Reducessupporting

confidence: 90%

Seasonal effects on plasma cortisol concentrations in the Bedouin buck: circadian studies and response to ACTH

Chergui¹,

Mormède²,

Foury³

et al. 2017

Animal

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“…Further, thyroxine levels were significantly (P<0.05) higher during summer in supplemented group animals compared to control group animals. Significant reduction in the plasma T 4 of control group animals during summer season compared to winter and rainy seasons in the present study was in agreement with the reports of Magdub et al (1982), Collier et al (1982), Habeeb et al (1996), Alameen and Abdelatif (2012), Banerjee et al (2013) and Al-Samawi et al (2014). As much of the thyro-peroxidase enzyme activity is involved in catalyzing H 2 O 2 generated during summer stress (Sivakumar et al, 2010), its availability for the oxidation of iodine ions from iodine atoms is reduced resulting in reduced T 4 synthesizing capacity of the thyroid follicular cells.…”

Section: Resultssupporting

confidence: 83%

“…Further, plasma T 3 levels were significantly lower in supplemented group animals compared to control counterparts. Similar findings were also reported by Rasooli et al (2004) in Holstein heifer, Sivakumar et al (2010) in heat stressed goats, Omran et al (2011) in buffalo calves, Banerjee et al (2013) in Gaddi, Chegu, Sirohi and Barbari breeds of goats, Sejian et al (2013) in Malpura ewes and Al-Samawi et al (2014) in female Aardi goat. The reduction in plasma T 3 during summer in control group animals could be attributed to the negative impact of summer temperature on thyroid function and thyroid hormone levels (Todini, 2007).…”

Section: Resultssupporting

confidence: 77%

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Effect of antioxidants supplementation on plasma hormonal profiles in Hallikar cattle during different seasons

Kalmath

Swamy

2018

IJAR

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Present study was carried out to ascertain the influence of different seasons on hormonal profiles in Hallikar cattle. Two groups (control and supplemented) of healthy female Hallikar cattle with six animals in each group selected from Madabal Village of Ramanagara District, Karnataka, India, were utilized for the present study. Selected animals were exposed to environmental stressors during three different seasons (winter, summer and rainy) by allowing them for grazing daily. Animals of control group received no supplementation but supplemented group received oral supplementation of vitamin E and selenium, during the study period. Blood samples collected from all the animals at monthly interval during three different seasons were processed to obtain the plasma which were stored at -80 ºC until they are utilized for determination of hormones like triiodothyronine (T 3 ), thyroxine (T 4 ), insulin and cortisol using radioimmunoassay technique. In the present study, triiodothyronine and thyroxine levels reduced significantly (P<0.05) during summer season compared to other seasons in control group animals. In both control and supplemented group, plasma insulin levels declined significantly (P<0.05) and plasma cortisol levels increased significantly (P<0.05) during summer compared to other seasons. Form the study, it was concluded that the summer stress reduces the thyroid and pancreatic activity leading reduced secretion of thyroid hormones and insulin. Further, the summer stress stimulates the adrenal cortical activity leading to enhanced secretion of the cortisol in Hallikar cattle.

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Impact of Adverse Environmental Stress on Productive and Reproductive Performance in Osmanabadi Goats

Sejian

Bagath

Krishnan

et al. 2017

Sustainable Goat Production in Adverse Environments: Volume I

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Thermoregulation of female Aardi goats exposed to environmental heat stress in Saudi Arabia

Cited by 24 publications

References 17 publications

Seasonal effects on plasma cortisol concentrations in the Bedouin buck: circadian studies and response to ACTH

Seasonal effects on plasma cortisol concentrations in the Bedouin buck: circadian studies and response to ACTH

Effect of antioxidants supplementation on plasma hormonal profiles in Hallikar cattle during different seasons

Impact of Adverse Environmental Stress on Productive and Reproductive Performance in Osmanabadi Goats

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