THE EPISODIC NATURE OF CHANGES IN OVINE PLASMA CORTISOL LEVELS AND THEIR RESPONSE TO ADRENALINE DURING ADAPTATION TO A NEW ENVIRONMENT

1973 ◽  
Vol 59 (1) ◽  
pp. 171-180 ◽  
Author(s):  
K. P. McNATTY ◽  
D. C. THURLEY
Keyword(s):  
Plasma Levels ◽  
Plasma Cortisol ◽  
Episodic Nature ◽  
Cortisol Levels

SUMMARY Large and rapid variations were found in the plasma cortisol levels of housed and cannulated sheep. Adrenaline injected i.v. caused increased plasma levels of cortisol that were proportionate to the dose. This response of cortisol to adrenaline was larger when sheep were newly housed, than when the sheep had been housed and sampled for 2 weeks. Response to adrenocorticotrophin also diminished over 2 weeks. Dexamethasone abolished the response to adrenaline. Tyrosine and DOPA had little effect on cortisol levels, dopamine and noradrenaline had some effect, but none had as great an effect as adrenaline.

scholarly journals Cortisol levels are positively associated with pup-feeding rates in male meerkats

2005 ◽  
Vol 273 (1586) ◽  
pp. 571-577 ◽  
Author(s):  
Anne A Carlson ◽  
Marta B Manser ◽  
Andrew J Young ◽  
Andrew F Russell ◽  
Neil R Jordan ◽  
...  
Keyword(s):  
Individual Differences ◽  
Plasma Levels ◽  
Significant Variation ◽  
Plasma Cortisol ◽  
Steroid Hormone ◽  
Feeding Rates ◽  
Hormonal Factors ◽  
Hormone Levels ◽  
Cortisol Levels

In societies of cooperative vertebrates, individual differences in contributions to offspring care are commonly substantial. Recent attempts to explain the causes of this variation have focused on correlations between contributions to care and the protein hormone prolactin, or the steroid hormone testosterone. However, such studies have seldom considered the importance of other hormones or controlled for non-hormonal factors that are correlative with both individual hormone levels and contributions to care. Using multivariate statistics, we show that hormone levels explain significant variation in contributions to pup-feeding by male meerkats, even after controlling for non-hormonal effects. However, long-term contributions to pup provisioning were significantly and positively correlated with plasma levels of cortisol rather than prolactin, while plasma levels of testosterone were not related to individual patterns of pup-feeding. Furthermore, a playback experiment that used pup begging calls to increase the feeding rates of male helpers gave rise to parallel increases in plasma cortisol levels, whilst prolactin and testosterone levels remained unchanged. Our findings confirm that hormones can explain significant amounts of variation in contributions to offspring feeding, and that cortisol, not prolactin, is the hormone most strongly associated with pup-feeding in cooperative male meerkats.

Influence of riders’ skill on plasma cortisol levels of horses walking on forest and field trekking courses

2017 ◽  
Vol 88 (10) ◽  
pp. 1629-1635 ◽  
Author(s):  
Ayaka Ono ◽  
Akihiro Matsuura ◽  
Yumi Yamazaki ◽  
Wakako Sakai ◽  
Kentaro Watanabe ◽  
...  
Keyword(s):  
Plasma Cortisol ◽  
Cortisol Levels

scholarly journals The effects of cisplatin, an emetic agent, on behavior and plasma cortisol levels in goats

2021 ◽  
Vol 92 (1) ◽  
Author(s):  
Masato Aoyama ◽  
Minami Shioya ◽  
Yume Tsukamoto ◽  
Hitomi Hasegawa ◽  
Shoei Sugita
Keyword(s):  
Plasma Cortisol ◽  
Cortisol Levels

Effects of different doses of eugenol on plasma cortisol levels and the quality of fresh and frozen-thawed sperm in South American catfish (Rhamdia quelen)

2019 ◽  
Vol 125 ◽  
pp. 135-139 ◽  
Author(s):  
Maira N. Corso ◽  
Lis S. Marques ◽  
Luis F.G. Gracia ◽  
Rômulo B. Rodrigues ◽  
Leonardo J.G. Barcellos ◽  
...  
Keyword(s):  
Plasma Cortisol ◽  
South American ◽  
Rhamdia Quelen ◽  
Cortisol Levels ◽  
Different Doses
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