Abstract:
:This study was designed to examine the relationship among ovulation rate, inhibin alpha-subunit gene expression, and plasma immunoreactive inhibin levels between hens laying at a high ovulation rate and hens laying at a low ovulation rate. A porcine inhibin alpha-subunit cDNA was used to examine the expression of inhibin alpha-subunit in the granulosa cell layers of preovulatory chicken follicles. Total RNA was extracted from granulosa layers of hens laying at a high and low rate and used in slot blot analyses. A dose-related increase in signal intensity with increasing doses of RNA for hens laying at a high and low rate was observed. The expression of the alpha-subunit of inhibin (per microgram of RNA) in granulosa layers of hens laying at a low rate was found to be greater than that in hens laying at a high rate (P < 0.001). Different groups of hens laying at the same rates as those used in the RNA determinations were selected for determination of plasma inhibin levels. Plasma samples from those hens laying at a high and low rate were collected from 1000 to 1800 hr at 2-hr intervals. Plasma inhibin, luteinizing hormone (LH), and follicle stimulating hormone (FSH) were determined by RIA. Plasma inhibin level was higher in hens laying at a low rate than that in those laying at a high rate (P < 0.05), while plasma LH level in hens laying at a low rate was lower than that in hens with a high ovulation rate (P < 0.01). There was no difference in plasma FSH level associated with rate of lay. Results in this study suggest that the ovulation rate-related changes in inhibin alpha-subunit gene expression and plasma immunoreactive inhibin level do not directly affect ovulation rate through a modulation of plasma FSH level.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Wang SY,Johnson PAdoi
10.1006/gcen.1993.1103subject
Has Abstractpub_date
1993-07-01 00:00:00pages
52-8issue
1eissn
0016-6480issn
1095-6840pii
S0016-6480(83)71103-2journal_volume
91pub_type
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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abstract::Growth hormone (GH) and insulin-like growth factor-I (IGF-I) play major roles in the endocrine regulation of fish growth, but their interdependency and mode of action has not been well elucidated. The GH-IGF-I system is essential for normal vertebral growth in mouse, but this has not been studied in fish. To study the...
journal_title:General and comparative endocrinology
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