. Control of ovulation; proceedings of the conference held at Endicott House, Dedham, Massachusetts, 1960. Ovulation -- Regulation. 150 Richard M. Fraps the greater range in apparent duration of OIH release in the hypophysectomy experiments can be attributed to difierences in techniques, birds, or in- accuracies in estimating times of expected or actual ovulation. It seems possible also, however, that an intact pituitary may be required beyond the interim required for OIH release. Progesterone is known to disappear rapidly from the blood stream. Taking this fact into account, Rothchild and Fra
. Control of ovulation; proceedings of the conference held at Endicott House, Dedham, Massachusetts, 1960. Ovulation -- Regulation. 150 Richard M. Fraps the greater range in apparent duration of OIH release in the hypophysectomy experiments can be attributed to difierences in techniques, birds, or in- accuracies in estimating times of expected or actual ovulation. It seems possible also, however, that an intact pituitary may be required beyond the interim required for OIH release. Progesterone is known to disappear rapidly from the blood stream. Taking this fact into account, Rothchild and Fraps (59) thought it improbable that progesterone could act for 2 to 4 hr to assure the release of OIH in adequate quantities. Progesterone, they suggested, may act promptly and. Fig. 4. A parasagittal view of the hen's diencephalon and forebrain, showing the sites of injections of progesterone made bilaterally at 1 mm. Solid circles, induced premature ovulation; open circles, no premature ovulation; 1, posterior commissure; 2, anterior commissure; 3, tractus septo-mesencephalicus; 4, optic chiasma; 5, oculomotor nerve; Pit, pituitary; H, hyperstriatum; N, neostriatum; P, paleostriatum. From Ralph and Fraps (54). over a limited time in effecting the release of OIH, the intact pituitary being essential for some time thereafter for secretion of a hormone required for maintenance of the ovulable follicle. In further experiments, the ovulation-inducing effects of small quantities of progesterone injected directly into various regions of the brain were ascertained (54). Stereotaxic procedures used in placing lesions were followed except for replacement of the electrode carrier by a microinjector with a 26 gauge needle. All injections into the brain were placed bilaterally, 5 /xg progesterone in propylene glycol at each site in the definitive experiments. Probably no more than half the quantity injected, or about 5 /ng/hen,. Please note that these images are extracted from scanned page
Size: 1606px × 1555px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, bookcollectionbiod
