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Sumpter et al. (1984) reported that significant increases in plasma levels of GtH, vitellogenin, E 2, and testosterone occurred at least one year before ovulation in trout. Formation of yolk vesicles in oocytes (termed endogenous vitellogenesis) began a full year before ovulation, while ovarian upta...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.337.549 http://intl-joe.endocrinology-journals.org/content/158/2/259.full.pdf |
| Summary: | Sumpter et al. (1984) reported that significant increases in plasma levels of GtH, vitellogenin, E 2, and testosterone occurred at least one year before ovulation in trout. Formation of yolk vesicles in oocytes (termed endogenous vitellogenesis) began a full year before ovulation, while ovarian uptake of liver-derived vitellogenin (exogenous vitellogenesis) started three months later, or about ten months before ovulation. Hyllner & Haux (1992) reported that the amount of vitelline envelope proteins in the plasma of maturing rainbow trout varied during the year, in a manner that was similar to vitellogenin. In Atlantic salmon, Lindhom (1997) observed parallel changes in plasma levels of zr-proteins and vitellogenin during a 21-month period before ovulation. Both data sets were interpreted in terms of a similar hormonal regulation of |
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