Changes in the plasma concentrations of free and conjugated oestrogens in heifers after treatment to induce superovulation and the relationship with number of ovulations
Oestradiol-17β and conjugated oestrone, oestradiol-17β and oestradiol-17α were measured in peripheral plasma of heifers treated with PMSG/PGF-2α to induce superovulation. Changes in the concentration of each hormone were synchronous, the highest level being near oestrus. For a given number of ovulations the hormone with the highest concentration was total oestradiol-17α, then came total oestrone, total oestradiol-17β and oestradiol-17β. For each oestrogen, the maximum preovulatory concentration measured was significantly correlated with the number of ovulations; the regression line for total oestradiol-17β was twice as steep as that for oestradiol-17β. It is concluded that in animals treated to induce superovulation assay of total oestradiol-17α gives a better indication of the number of follicles induced to ovulate than does the more conventional assay of oestradiol-17β.
| Main Authors: | , |
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| Format: | journal article biblioteca |
| Language: | eng |
| Published: |
1982
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| Online Access: | http://hdl.handle.net/20.500.12792/4255 |
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