Search Results - "GINTHER, O. J"

Up-regulation of endometrial oxytocin receptor is associated with the timing of luteolysis in heifers with two and three follicular waves by Domingues, Rafael R, Ginther, O. J, Gomez-León, Victor E, Wiltbank, Milo C

“…Initiation of luteolysis in ruminants is variable due to ill-defined mechanisms. Cycles of two follicular waves are shorter and have earlier luteolysis than…”
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Dynamics of Circulating Progesterone Concentrations Before and During Luteolysis: A Comparison Between Cattle and Horses by GINTHER, O. J, BEG, M. A

“…The profile of circulating progesterone concentration is more dynamic in cattle than in horses. Greater prominence of progesterone fluctuations in cattle than…”
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Follicle selection in cattle and horses: role of intrafollicular factors by Beg, M A, Ginther, O J

“…The eminent event in follicle selection during a follicular wave in monovular species is diameter deviation, wherein one follicle continues to grow (developing…”
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Gonadotropin-Releasing Hormone, Estradiol, and Inhibin Regulation of Follicle-Stimulating Hormone and Luteinizing Hormone Surges: Implications for Follicle Emergence and Selection in Heifers by HAUGHIAN, James M, GINTHER, O. J, DIAZ, Francisco J, WILTBANK, Milo C

“…Mechanisms regulating gonadotropin surges and gonadotropin requirements for follicle emergence and selection were studied in heifers. Experiment 1 evaluated…”
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Processes involved in prostaglandin F2alpha autoamplification in heifers by Domingues, Rafael R, Ginther, OJ, Gomez-Leon, Victor, Nunes da Silva, Polyana, Castro, Thadeu, Hoppmann, August, Wiltbank, Milo C

“…In brief Endometrial and luteal synthesis of prostaglandin F2alpha (PGF2A) occurs before and during luteolysis and is critical for luteal regression. This…”
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Plasma Clearance and Half-Life of Prostaglandin F2alpha: A Comparison Between Mares and Heifers by SHRESTHA, Hemanta K, BEG, Mohd A, BURNETTE, Ronald R, GINTHER, O. J

“…Horses are about five times more sensitive to the luteolytic effect of prostaglandin F2alpha (PGF) than cattle, as indicated by a recommended clinical dose of…”
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Necessity of Sequential Pulses of Prostaglandin F2alpha for Complete Physiologic Luteolysis in Cattle by Ginther, O.J, Araujo, R.R, Palhão, M.P, Rodrigues, B.L, Beg, M.A

“…The luteolytic effects of exogenous prostaglandin F2alpha (PGF) that did and did not simulate natural 13,14-dihydro-15-keto-PGF (PGFM) pulses were studied…”
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Characteristics of Pulses of 13,14-Dihydro-15-Keto-Prostaglandin F2alpha Before, During, and after Spontaneous Luteolysis and Temporal Intrapulse Relationships with Progesterone Concentrations in Cattle by Ginther, O.J, Shrestha, H.K, Fuenzalida, M.J, Shahiduzzaman, A.K.M, Beg, M.A

“…Pulses of the prostaglandin F2alpha (PGF) metabolite 13,14-dihydro-15-keto-PGF (PGFM) were compared among heifers that were in the preluteolytic, luteolytic,…”
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Follicular Deviation and Acquisition of Ovulatory Capacity in Bovine Follicles by SARTORI, Roberto, FRICKE, Paul M, FERREIRA, Joao C. P, GINTHER, O. J, WILTBANK, Milo C

“…Selection of dominant follicles in cattle is associated with a deviation in growth rate between the dominant and largest subordinate follicle of a wave…”
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Local effect of the conceptus on uterine vascular perfusion during early pregnancy in heifers by Silva, L A, Ginther, O J

“…Colour-Doppler ultrasonography was used to study the spatial relationship between vascular perfusion in the middle of each uterine horn and the reported…”
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Pulsatility and Interrelationships of 13,14-Dihydro-15-Keto-PGF2alpha (PGFM), Luteinizing Hormone, Progesterone, and Estradiol in Heifers by GINTHER, O. J, FUENZALIDA, Maria J, HANNAN, Minhaj A, BEG, Mohd A

“…Temporality among episodes of a prostaglandin F2alpha metabolite (PGFM), progesterone (P4), luteinizing hormone (LH), and estradiol (E2) were studied during…”
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Systemic concentrations of hormones during the development of follicular waves in mares and women: a comparative study by Ginther, O J, Beg, M A, Gastal, E L, Gastal, M O, Baerwald, A R, Pierson, R A

“…Changes in systemic concentrations of FSH, LH, oestradiol and progesterone during the ovulatory follicular wave were compared between 30 mares and 30 women…”
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Follicle Selection in Monovular Species by GINTHER, O. J, BEG, M. A, BERGFELT, D. R, DONADEU, F. X, KOT, K

“…Follicle deviation is proposed to be the eminent event in follicle selection in monovular species. At deviation, the largest follicle establishes dominance…”
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Relationships of changes in B-mode echotexture and colour-Doppler signals in the wall of the preovulatory follicle to changes in systemic oestradiol concentrations and the effects of human chorionic gonadotrophin in mares by Gastal, E L, Gastal, M O, Ginther, O J

“…A duplex grey-scale and colour-Doppler ultrasound instrument was used to study the changes in the wall of the preovulatory follicle in mares. When the follicle…”
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Luteal blood flow and concentrations of circulating progesterone and other hormones associated with a simulated pulse of 13,14-dihydro-15-keto-prostaglandin F2α in heifers by Shrestha, H K, Beg, M A, Imam, S, Ginther, O J

“…Progesterone and luteal blood flow effects of an i.u. 2-h infusion of 0.25 mg/h of prostaglandin F2α (PGF) that simulated a natural pulse of…”
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Uteroovarian pathway for embryo-empowered maintenance of the corpus luteum in farm animals by Ginther, O J

“…The first luteal response to pregnancy in farm animals at 12-18 days after ovulation involves maintenance of the corpus luteum (CL) if pregnancy has occurred…”
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A century of research on the uteroovarian pathway for uterine-induced luteolysis in mammals by Ginther, O.J.

“…Year 2023 is the 100-year anniversary of the discovery in guinea pigs that the lifespan of the corpus luteum (CL) is controlled by the uterus. The CL is the…”
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Comparative Study of the Dynamics of Follicular Waves in Mares and Women by GINTHER, O. J, GASTAL, E. L, GASTAL, M. O, BERGFELT, D. R, BAERWALD, A. R, PIERSON, R. A

“…Deviation in growth rates of the follicles of the ovulatory wave begins at the end of a common growth phase and is characterized by continued growth of the…”
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The theory of follicle selection in cattle by Ginther, O.J.

“…Selection of the dominant follicle (DF) during a follicular wave is manifested by diameter deviation or continued growth rate of the largest follicle (F1) and…”
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Regulation of Circulating Gonadotropins by the Negative Effects of Ovarian Hormones in Mares by GINTHER, O. J, GASTAL, E. L, GASTAL, M. O, BEG, M. A

“…The functional and temporal relationships between circulating gonadotropins and ovarian hormones in mares during Days 7–27 (ovulation = Day 0) was studied…”
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