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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
6
|
| pubmed:dateCreated |
1990-1-24
|
| pubmed:abstractText |
Simultaneous or sequential injection of 250 ng gonadotrophin releasing hormone (GnRH) and 25 micrograms oestradiol benzoate, with luteinizing hormone (LH) measurements at 0, +20 min (after GnRH) and +16 h (after oestradiol), enabled investigation of the positive feedback effects on the hypothalamus and pituitary. Control ewes had pretreatment LH values of 3.1 +/- 1.2 ng/ml with an increment of 3.2 +/- 2.3 ng/ml 20 min after GnRH. Subfertile ewes, in spite of elevated pretreatment LH concentrations (15.8 +/- 9.5 ng/ml) in eight out of 10 ewes, had increments of 1.4-84 ng/ml after GnRH. Control ewes had LH increments of 3-75 ng/ml 16 h after oestradiol. Subfertile ewes with pretreatment LH concentrations less than 15 ng/ml also responded to oestradiol whereas those with initial LH concentrations 16-40 ng/ml had no further LH increment. Subsequent administration of 1000 iu pregnant mares' serum gonadotrophin (PMSG), with measurement of LH and oestradiol at 0, +24, +30, +48, +54, and +72 h, allowed assessment of ovarian response and hypothalamus-pituitary function. Five control ewes were sampled up to 30 h post-PMSG and only 1 had oestradiol concentrations greater than 10 pg/ml. Sampling up to 72 h in another five control ewes resulted in oestradiol concentrations greater than 10 pg/ml. Increments in LH concentration greater than 3 ng/ml were recorded in control and subfertile ewes with oestradiol concentrations greater than 10 pg/ml. The use of these endocrine challenge tests enabled positive diagnosis of abnormality on 8 out of 10 occasions.(ABSTRACT TRUNCATED AT 250 WORDS)
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:issn |
0007-1935
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
145
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
523-30
|
| pubmed:dateRevised |
2003-11-14
|
| pubmed:meshHeading |
pubmed-meshheading:2686804-Animals,
pubmed-meshheading:2686804-Estradiol,
pubmed-meshheading:2686804-Female,
pubmed-meshheading:2686804-Infertility, Female,
pubmed-meshheading:2686804-Luteinizing Hormone,
pubmed-meshheading:2686804-Pituitary Hormone-Releasing Hormones,
pubmed-meshheading:2686804-Sheep,
pubmed-meshheading:2686804-Sheep Diseases
|
| pubmed:articleTitle |
Development of an endocrine challenge test to investigate subfertility in ewes.
|
| pubmed:publicationType |
Journal Article
|