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Registro Completo |
Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
Data corrente: |
22/06/2017 |
Data da última atualização: |
22/06/2017 |
Autoria: |
MANN, G. E.; McNEILLY, A. S.; BAIRD, D. T. |
Título: |
Source of ovarian inhibin secretion during the oestrous cycle of the sheep. |
Ano de publicação: |
1989 |
Fonte/Imprenta: |
Journal of Endocrinology, v. 123, n. 2, p. 181-188, Nov. 1989. |
DOI: |
10.1677/joe.0.1230181 |
Idioma: |
Inglês |
Conteúdo: |
Abstract: The source of inhibin secretion by the ovary in the sheep at different stages of the oestrous cycle was investigated by in-vivo cannulation of the ovarian veins. Twenty-four Scottish Blackface ewes were allocated to four groups of six ewes, i.e. those operated on during the luteal phase (day 10), and those operated on during the follicular phase 24-30, 36 and 60 h following an injection of 125 micrograms cloprostenol on day 10 of the luteal phase. Samples of jugular and timed ovarian venous blood were collected under anaesthesia before and after enucleation of the corpus luteum. Ovaries were then removed and follicles dissected out. Following injection of cloprostenol, luteal regression occurred as indicated by a fall in the secretion of progesterone. The concentration of inhibin in jugular venous plasma and its ovarian secretion rate were similar at all stages of the follicular phase and during the luteal phase. In contrast, the secretion rate of oestradiol rose from 2.86 +/- 0.73 pmol/min during the luteal phase to 8.70 +/- 2.24 pmol/min 24 h after injection of cloprostenol (P less than 0.05). Following enucleation of the corpus luteum the secretion rate of progesterone fell from 809 +/- 270 pmol/min to 86 +/- 30 pmol/min (P less than 0.001). There was also a smaller, artifactual fall in the secretion rate of oestradiol following enucleation of the corpus luteum, which was of similar size to a fall seen in the secretion rate of inhibin. This resulted in a significant (P less than 0.001) fall in the ratio of progesterone to inhibin, while the oestradiol to inhibin ratio remained unchanged. MenosAbstract: The source of inhibin secretion by the ovary in the sheep at different stages of the oestrous cycle was investigated by in-vivo cannulation of the ovarian veins. Twenty-four Scottish Blackface ewes were allocated to four groups of six ewes, i.e. those operated on during the luteal phase (day 10), and those operated on during the follicular phase 24-30, 36 and 60 h following an injection of 125 micrograms cloprostenol on day 10 of the luteal phase. Samples of jugular and timed ovarian venous blood were collected under anaesthesia before and after enucleation of the corpus luteum. Ovaries were then removed and follicles dissected out. Following injection of cloprostenol, luteal regression occurred as indicated by a fall in the secretion of progesterone. The concentration of inhibin in jugular venous plasma and its ovarian secretion rate were similar at all stages of the follicular phase and during the luteal phase. In contrast, the secretion rate of oestradiol rose from 2.86 +/- 0.73 pmol/min during the luteal phase to 8.70 +/- 2.24 pmol/min 24 h after injection of cloprostenol (P less than 0.05). Following enucleation of the corpus luteum the secretion rate of progesterone fell from 809 +/- 270 pmol/min to 86 +/- 30 pmol/min (P less than 0.001). There was also a smaller, artifactual fall in the secretion rate of oestradiol following enucleation of the corpus luteum, which was of similar size to a fall seen in the secretion rate of inhibin. This resulted in a signifi... Mostrar Tudo |
Palavras-Chave: |
FSH; LH; Ovaries. |
Thesagro: |
Estradiol. |
Thesaurus Nal: |
cloprostenol; Corpus Luteum; Ewes; Pharmacology; Progesterone; Secretion; Sheep. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02365naa a2200289 a 4500 001 2071366 005 2017-06-22 008 1989 bl uuuu u00u1 u #d 024 7 $a10.1677/joe.0.1230181$2DOI 100 1 $aMANN, G. E. 245 $aSource of ovarian inhibin secretion during the oestrous cycle of the sheep. 260 $c1989 520 $aAbstract: The source of inhibin secretion by the ovary in the sheep at different stages of the oestrous cycle was investigated by in-vivo cannulation of the ovarian veins. Twenty-four Scottish Blackface ewes were allocated to four groups of six ewes, i.e. those operated on during the luteal phase (day 10), and those operated on during the follicular phase 24-30, 36 and 60 h following an injection of 125 micrograms cloprostenol on day 10 of the luteal phase. Samples of jugular and timed ovarian venous blood were collected under anaesthesia before and after enucleation of the corpus luteum. Ovaries were then removed and follicles dissected out. Following injection of cloprostenol, luteal regression occurred as indicated by a fall in the secretion of progesterone. The concentration of inhibin in jugular venous plasma and its ovarian secretion rate were similar at all stages of the follicular phase and during the luteal phase. In contrast, the secretion rate of oestradiol rose from 2.86 +/- 0.73 pmol/min during the luteal phase to 8.70 +/- 2.24 pmol/min 24 h after injection of cloprostenol (P less than 0.05). Following enucleation of the corpus luteum the secretion rate of progesterone fell from 809 +/- 270 pmol/min to 86 +/- 30 pmol/min (P less than 0.001). There was also a smaller, artifactual fall in the secretion rate of oestradiol following enucleation of the corpus luteum, which was of similar size to a fall seen in the secretion rate of inhibin. This resulted in a significant (P less than 0.001) fall in the ratio of progesterone to inhibin, while the oestradiol to inhibin ratio remained unchanged. 650 $acloprostenol 650 $aCorpus Luteum 650 $aEwes 650 $aPharmacology 650 $aProgesterone 650 $aSecretion 650 $aSheep 650 $aEstradiol 653 $aFSH 653 $aLH 653 $aOvaries 700 1 $aMcNEILLY, A. S. 700 1 $aBAIRD, D. T. 773 $tJournal of Endocrinology$gv. 123, n. 2, p. 181-188, Nov. 1989.
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