Glucose metabolism and plasma progesterone and corticoids during the estrous cycle of ewes

Dunn, TG; Hopwood, M. L.; Wa, House; Lc, Faulkner

doi:10.1152/ajplegacy.1972.222.2.468

Cited by 10 publications

(6 citation statements)

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“…The mean body weight of our sheep was 38 kg, so that the mean recycled glucose increased from 4-9 to 14-4 mg/min. This was a much smaller increase than that of Dunn et al (1972) who reported an increase from 3 to about 60 mg/min. However, hormones other than progesterone may have influenced their results.…”

Section: Discussioncontrasting

confidence: 61%

“…This finding suggests that the increase in glucose recycling during dioestrus reported by Dunn et al (1972) was also due to progesterone, although the pattern of their experiments did not enable them to reach this conclusion. The mean body weight of our sheep was 38 kg, so that the mean recycled glucose increased from 4-9 to 14-4 mg/min.…”

Section: Discussionmentioning

confidence: 81%

“…The significant effect was an increase in glucose recycling, and as the only observed difference between the sheep before and after implantation was the increase in circulating progesterone the increase in recycling may be attributed to this. This finding suggests that the increase in glucose recycling during dioestrus reported by Dunn et al (1972) was also due to progesterone, although the pattern of their experiments did not enable them to reach this conclusion. The mean body weight of our sheep was 38 kg, so that the mean recycled glucose increased from 4-9 to 14-4 mg/min.…”

Section: Discussionmentioning

confidence: 81%

“…The changes in glucose utilization which are known to occur during pregnancy (Bergman, 1963) suggest that one or more of the reproductive hormones may have a regulatory influence. Dunn, Hopwood, House & Faulkner (1972) found that the concentration of glucose in the plasma of sheep, and its recycling rate, were greater in dioestrus than in oestrus. There were no significant changes in pool size, glucose space or irreversible loss.…”

Section: Introductionmentioning

confidence: 93%

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The Effects of Progesterone on Glucose and Lactate Metabolism in Ovariectomized Sheep

Samad

Ford

1981

Exp Physiol

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SUMMARYIn nine samples from four ovariectomized sheep the mean plasma concentration of progesterone was 0 19 + 0 04 ng/ml. After the subcutaneous implantation of 3 x 375 mg of progesterone in silicone rubber the concentration rose to 3-8 + 0-51 ng/ml at 48 h and fell steadily to 1 5 ng/ml at 21 days. Removal of the implants caused a reduction to pre-implantation values by 48 h. The increased concentration of circulating progesterone after implantation had no significant effect on the concentration of glucose in plasma, its total entry rate, irreversible loss or on plasma lactate concentration. Glucose recycling increased from 0-13 + 005 to 0-38 + 0-12 mg min-' kg-' (P < 005). Lactate entry rate fell from 1 68 +0-16 to 1 12 +0 10 mgmin-' kg-' (P < 0 02). The total net formation of lactate from glucose fell from 0-56 + 005 to 0-41 + 0-08 mg min-' kg-' (P < 0 05). The production of lactate from non-glucose substrates fell from 115 + 011 to 0 70 + 0 04 mg min-kg-' (P < 0 02). The utilization of lactate for purposes other than glucose synthesis fell from [-50+0-14 to 0 97+0 09mgmin' kg-' (P < 0 05). The r sults support the view that progesterone produces an increase in glucose recycling by pathways involving compounds other than lactate.

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Section: Discussioncontrasting

confidence: 61%

Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 93%

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The Effects of Progesterone on Glucose and Lactate Metabolism in Ovariectomized Sheep

Samad

Ford

1981

Exp Physiol

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“…This was avoided by waiting until they had ceased oestrus activity (i.e. March) and when progesterone levels would have been at their lowest (Dunn et al 1972), before measurements were made. Both A and VP ewes were housed in a similar environment of constant light and temperature for the duration of the experiment and were fed dried grass of uniform composition.…”

Section: Discussionmentioning

confidence: 99%

Changes in propionate and glucose metabolism during synchronization of oestrus in ewes

Wilson¹

1984

J. Agric. Sci.

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SUMMARYPropionate and glucose metabolism were compared in two groups of Scottish Blackface ewes, one in which ewes had been fitted with vaginal pessaries impregnated with progesterone-analogue for the synchronization of oestrus and the other when ewes were in anoestrus. In ewes given the same amount of feed, the production rate of propionate increased significantly (P < 0·05) from 33 in anoestrous ewes to 44 gC/day in ewes with pessaries. The proportion of glucose-carbon apparently synthesized from propionate also increased significantly (P < 0·05) from 0·31 in anoestrous ewes to 0·44 in ewes with pessaries. The proportion of glucose-carbon apparently recycled was also significantly (P < 0·01) increased from 0·12 to 0·22. No changes were observed in glucose concentration, production rate or oxidation rate between the two groups of ewes.

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Carbohydrate and Lipid Metabolism

Lindsay¹,

Leat²

1975

The Blood of Sheep

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Glucose metabolism and plasma progesterone and corticoids during the estrous cycle of ewes

Cited by 10 publications

References 0 publications

The Effects of Progesterone on Glucose and Lactate Metabolism in Ovariectomized Sheep

The Effects of Progesterone on Glucose and Lactate Metabolism in Ovariectomized Sheep

Changes in propionate and glucose metabolism during synchronization of oestrus in ewes

Carbohydrate and Lipid Metabolism

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