Cortisol Turnover in Heat-Stressed Cows

Christison, G. I.; Johnson, H. D.

doi:10.2527/jas1972.3551005x

Cited by 173 publications

(108 citation statements)

References 10 publications

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“…Apart from responding to milking/ suckling (Johke 1969;Koprowski and Tucker 1973), the secretion of both hormones, in ruminants, is influenced by stress (Raud et al 1971;Fulkerson and Jamieson, personal communications), temperature (Christison and Johnson 1972;Wetteman and Tucker 1974) and reproductive state (Edgerton and Hafs 1973;see Karg et al 1973). In addition, prolactin secretion changes in response to daylength or season (Schams and Reinhardt 1974); oestrus (Raud et al 1971) and administration of various hormones (oestrogen-Fell et al 1972;prostaglandins-Gray et al 1979).…”

Section: Introductionmentioning

confidence: 99%

Investigations of Ultradian and Circadian Rhythms in the Concentration of Cortisol and Prolactin in the Plasma of Dairy Cattle

Fulkerson¹,

Sawyer²,

Gow³

1980

Aust. Jnl. Of Bio. Sci.

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This experiment analysed the circadian and ultradian pattern of secretion of cortisol and prolactin in cattle, and from this a meaningful sampling technique for these hormones has been suggested.Two Friesian and two Jersey heifers, non-pregnant and 18 months of age, were bled (2 ml blood) every 10 min for 24 h via an indwelling jugular cannula inserted 6 h before sampling commenced.The concentration of cortisol in plasma showed an ultradian rhythm with an amplitude of approximately 30 ng/ml and a frequency of about 0·6 cycles/h. Elimination of the ultradian component of variation, by taking the mean of the rolling means (last three values) for individual heifers, indicated a diurnal variation in cortisol concentration which was high between midnight and midmorning and low in the afternoon.There were frequent sporadic 'bursts' of prolactin secretion but these were inconsistent. There was no evidence of diurnal variation in prolactin concentration, or of a temporal relationship between cortisol and prolactin secretion.

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Section: Introductionmentioning

confidence: 99%

Investigations of Ultradian and Circadian Rhythms in the Concentration of Cortisol and Prolactin in the Plasma of Dairy Cattle

Fulkerson¹,

Sawyer²,

Gow³

1980

Aust. Jnl. Of Bio. Sci.

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“…This inconsistency might be due to the fact that Sano et al (2000) determined the glucose TR on the 2 nd day of HE, whereas in the present experiment it was evaluated on the 5 th day. Physiological adjustment to prolonged heat may have contributed to a lack of response to heat stress in the present study (Christison and Johnson, 1972). The plasma glucose utilization rate decreased for both the diets and both environmental treatments during the last 120 min of the isotope dilution technique, while exogenous insulin was infused.…”

Section: Discussionmentioning

confidence: 67%

Responses of plasma glucose metabolism to exogenous insulin infusion in sheep-fed forage herb plantain and exposed to heat

Al-Mamun

Shibuya

Kajita

et al. 2017

Animal

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The use of herbal plants as traditional medicines has a century long history. Plantain (Plantago lanceolata L.) is a perennial herb containing bioactive components with free radical scavenging activities. An isotope dilution technique using [U-13 C]glucose was conducted to determine the effect of plantain on the responses of plasma glucose metabolism to exogenous insulin infusion in sheep. Six crossbred sheep (three wethers and three ewes; mean initial BW = 40 ± 2 kg) were fed either a mixed hay of orchardgrass ( Dactylis glomerata) and reed canarygrass ( Phalaris arundinacea) (MH-diet) or mixed hay and fresh plantain (1 : 1 ratio, dry matter basis, PL-diet) and exposed to a thermoneutral (TN, 20°C; 70% relative humidity (RH)) environment or a heat exposure (HE, 30°C; 70% RH) for 5 days using a crossover design for two 23-day periods. The isotope dilution was conducted on days 18 and 23 of the experimental period during TN and HE, respectively. Plasma concentration of α-tocopherol was greater ( P < 0.0001) for the PL-diet than the MH-diet and remained comparable between environmental treatments. Plasma glucose concentration before isotope dilution technique was reduced for sheep ( P = 0.05) during HE compared with TN and remained comparable between diets. Plasma glucose turnover rate during the preinfusion period of insulin did not differ ( P = 0.10) between dietary treatments and between environments ( P = 0.65). The response of plasma glucose utilization to exogenous insulin administration was lower ( P = 0.04) for the PL-diet than the MH-diet. Under present experimental conditions, the plantain group was found to be resistant to the effects of insulin infusion.Keywords: glucose metabolism, plantain, insulin, heat stress, sheep Implications Plantain (Plantago lanceolata L.) is a perennial herb having bioactive components. The present experiment evaluated the effect of plantain on the responses of plasma glucose metabolism to exogenous insulin in heat-exposed sheep. Plasma glucose turnover rate (TR) was affected neither by feeding plantain nor exposure to a hot environment (30°C, 70% relative humidity (RH)). However, the response of plasma glucose utilization to exogenous insulin infusion was reduced in sheep when 50% of the mixed hay of orchardgrass (Dactylis glomerata) and reed canarygrass (Phalaris arundinacea) diet was replaced by fresh plantain.

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“…A few animal studies [11][12][13][14] suggest that glucocorticoids have an anabolic effect with an increase in hepatic ATP levels. Exposure of cows to high temperature (31°C) for a long period of time (eight weeks) caused a depression in the plasma hydrocortisone secretion rate, 11,15 indicating a possible role of hydrocortisone in thermoregulatory mechanisms. In addition, glucocorticoids have been shown to exert a number of rapid actions which are independent of the regulations of gene transcription.…”

Section: Discussionmentioning

confidence: 99%

Hydrocortisone reduces postoperative shivering following day care knee arthroscopy

Pawar

Suri

Kaul

et al. 2011

Can J Anesth/J Can Anesth

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Cortisol Turnover in Heat-Stressed Cows

Cited by 173 publications

References 10 publications

Investigations of Ultradian and Circadian Rhythms in the Concentration of Cortisol and Prolactin in the Plasma of Dairy Cattle

Investigations of Ultradian and Circadian Rhythms in the Concentration of Cortisol and Prolactin in the Plasma of Dairy Cattle

Responses of plasma glucose metabolism to exogenous insulin infusion in sheep-fed forage herb plantain and exposed to heat

Hydrocortisone reduces postoperative shivering following day care knee arthroscopy

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