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PubMed1982

The induction of ovulation and luteal function in seasonally anoestrous ewes treated with small-dose multiple injections of Gn-RH.

Seasonally anoestrous ewes were injected i.v. with 250, 500 or 1000 ng Gn-RH at 2-h intervals for 8 days (2 sheep/treatment). Each injection of 250 or 500 ng Gn-RH resulted in a transient rise in plasma LH concentrations. Treatment with 1000 ng Gn-RH per injection resulted in a more sustained rise in plasma LH concentrations in 1 of 2 sheep during the early part of the treatment period. A preovulatory-type LH peak occurred 17-48 h after the start of treatment in all ewes, with a second preovulatory-type peak 106-133 h later in those ewes receiving 500 or 1000 ng Gn-RH per injection. Ovulation, with subsequent normal luteal function, occurred in all sheep. However, the rise in plasma progesterone concentrations appeared to be delayed in those ewes treated with 500 or 1000 ng Gn-RH compared to ewes treated with 250 ng Gn-RH. These data suggest that the absence of ovulation during seasonal anoestrus is due to an inadequate pattern of episodic LH secretion.

Anestrus↗
PubMed1987

Induction of ovulation, mating, and conception in androgen-treated immature rats.

Attempts were made to induce pregnancy in androgen-treated immature rats. Treatment with PMSG alone, which causes ovulation in normal immature rats, failed to cause ovulation in androgenized rats. However, treatment with PMSG plus LHRH was effective in causing ovulation. After ovulation, some of the normal and androgenized rats mated. Normal mated rats became pregnant but androgenized mated rats did not. However, when a pituitary gland was transplanted from a normal rat into the kidney capsule of an androgenized rat to maintain functional corpora lutea, implantation occurred in some of the mated animals. The positive decidual reaction in the uteri of such androgenized rats was similar to that observed in normal rats. These results suggest that the uterine sensitivity to blastocyst implantation of androgenized immature rats may be normal.

Animals↗