INFUSION OF ESTRADIOL DURING THE LUTEAL PHASE OF THE ESTROUS CYCLE IN THE EWE COMPLETELY ELIMINATES LH PULSES
Autor: | I. B. J. K. Joseph, N. C. Rawlings |
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Rok vydání: | 1990 |
Předmět: | |
Zdroj: | Canadian Journal of Animal Science. 70:1147-1150 |
ISSN: | 1918-1825 0008-3984 |
Popis: | Elevation of serum estradiol (E2) levels to ≈ 23 pg mL−1 on day 12 of the estrous cycle of the ewe eliminated LH pulses, but did not induce luteolysis and a preovulatory surge release of gonadotropins. The E2 treatment appeared to exert a functional luteotropic effect. The results indicate a strong synergism between E2 and progesterone (P4) in the control of tonic LH secretion during the luteal phase and that P4 blocks the preovulatory LH surge mechanism at high, but physiological levels of E2. Key words: Estradiol, LH pulses, luteal phase, ewe, luteotropic |
Databáze: | OpenAIRE |
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