Výsledky vyhledávání

Frequency of luteinizing hormone pulses in cattle influences duration of persistence of dominant ovarian follicles, follicular fluid concentrations of steroids, and activity of insulin-like growth factor binding proteins

Autor: D.V. Mariscal-Aguayo, M. Garcia-Winder, J. E. Kinder, Andrea S. Cupp, E. G. M. Bergfeld, T. Sanchez-Torres, M. E. Wehrman, F. N. Kojima, Debra T. Clopton, K.E. Fike, Andrew J. Roberts

Publikováno v: Animal Reproduction Science. 77:187-211

The objectives of the present study were to determine how varying frequency of LH pulses as controlled by varying treatments with progesterone (P4) in cattle would affect: (1) concentration of steroid hormones and activity of insulin-like growth fact

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::50383bcd916181fa39babe58d396d0dc
https://doi.org/10.1016/s0378-4320(03)00038-1

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Corpus Luteum Development and Function in Cattle with Episodic Release of Luteinizing Hormone Pulses Inhibited in the Follicular and Early Luteal Phases of the Estrous Cycle1

Autor: B.R. Lindsey, E.J. Melvin, E. L. Zanella, J. E. Kinder, J.A. Quintal-Franco, M. E. Wehrman, F. N. Kojima, K.E. Fike, Debra T. Clopton

Publikováno v: Biology of Reproduction. 61:921-926

The influence of episodic LH pulses before and subsequent to ovulation on size and function of the corpus luteum (CL) in cattle was examined. Treatments were 1) control; 2) LHRH antagonist starting 2 days before the preovulatory LH surge (Antagonist

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8eb79c16f3fddd5dd2dfd6dd1a375276
https://doi.org/10.1095/biolreprod61.4.921

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Changing Dose of Progesterone Results in Sudden Changes in Frequency of Luteinizing Hormone Pulses and Secretion of 17β-Estradiol in Bovine Females1

Autor: F. N. Kojima, T. Sanchez, V. Mariscal, M. E. Wehrman, E. G. M. Bergfeld, K. E. Peters, Andrea S. Cupp, J. E. Kinder

Publikováno v: Biology of Reproduction. 54:546-553

The aim of the present study was to elucidate the time course according to which changes in circulating concentrations of progesterone influence pulsatile secretion of LH and secretion of 17 beta-estradiol. Our working hypothesis was that changing th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b67b8d0b549e701e9004c2196cb46bc1
https://doi.org/10.1095/biolreprod54.3.546

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Influence of fenceline bull exposure on duration of postpartum anoestrus and pregnancy rate in beef cows

Autor: K.E. Fike, F. N. Kojima, V. Mariscal, M. E. Wehrman, Andrea S. Cupp, J. E. Kinder, E. G. M. Bergfeld, T. Sanchez

Publikováno v: Animal Reproduction Science. 41:161-167

Two experiments (1991 and 1992) were conducted to test the hypotheses that fenceline exposure of cows to bulls following parturition shortens duration of postpartum anoestrus and improves pregnancy rate to artificial insemination (AI). In Experiments

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ecb5ecf51c9752885cbdcabf9a02f4bb
https://doi.org/10.1016/0378-4320(95)01446-2

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Development of persistent ovarian follicles during synchronization of estrus influences the superovulatory response to FSH treatment in cattle

Autor: V. Mariscal, Andrea S. Cupp, M. E. Wehrman, F. N. Kojima, K.E. Fike, E. G. M. Bergfeld, J. E. Kinder, T. Sanchez

Publikováno v: Theriogenology. 45:593-610

The synchronization of estrus with synthetic progestins or progesterone (P(4)) results in the development of a large, persistent ovarian follicle. The objectives of the present study were to determine if development of a persistent ovarian follicle d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::558abc4c3fe0b3b156c6b7bf762a668d
https://doi.org/10.1016/0093-691x(95)00406-x

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Dosage of the Synthetic Progestin, Norgestomet, Influences Luteinizing Hormone Pulse Frequency and Endogenous Secretion of 17βEestradiol in Heifers1

Autor: E. G. M. Bergfeld, M. E. Wehrman, K. E. Peters, Andrea S. Cupp, F. N. Kojima, Roger J. Kittok, J. E. Kinder, T. Sanchez, V. Mariscal

Publikováno v: Biology of Reproduction. 52:464-469

The objective of this study was to determine whether there were doses at which the synthetic progestin, norgestomet, could mimic midluteal phase concentrations of progesterone in regulating the secretion of LH and 17p-estradiol in bovine females. Hei

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d23eef72f1ee3a2452f5a62d6a7a0b3d
https://doi.org/10.1095/biolreprod52.2.464

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Effects of 17β-Estradiol on Distribution of Pituitary Isoforms of Luteinizing Hormone and Follicle-Stimulating Hormone during the Follicular Phase of the Bovine Estrous Cycle1

Autor: Mark S. Roberson, T. T. Stumpf, D. D. Zalesky, Andrea S. Cupp, Roger J. Kittok, L. A. Werth, M. W. Wolfe, J. E. Kinder, H. E. Grotjan, F. N. Kojima

Publikováno v: Biology of Reproduction. 52:297-304

The objective of this study was to examine the influence of 17β-estradiol (E 2 ) on distribution of LH and FSH isoforms d the follicular phase of the bovine estrous cycle prior to the preovulatory surges of LH and FSH. On Day 16 of the estrous cycle

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d47c98926c7576bac8dfabf4140200ce
https://doi.org/10.1095/biolreprod52.2.297

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Increasing Concentrations of 17β-Estradiol Has Differential Effects on Secretion of Luteinizing Hormone and Follicle-Stimulating Hormone and Amounts of Mrna for Gonadotropin Subunits During the Follicular Phase of the Bovine Estrous Cycle1

Autor: F. N. Kojima, Mark S. Roberson, Roger J. Kittok, J. E. Kinder, L. A. Werth, M. F. Wolfe, T. T. Stumpf, H. E. Grotjan, Andrea S. Cupp

Publikováno v: Biology of Reproduction. 52:288-296

The hypothesis tested was that 17[0-estradiol (E,) would increase amounts of mRNA for oa, LH[, and FSH[ subunits during the follicular phase of the estrous cycle prior to the preovulatory surge of gonadotropins in cows. On Day 16 (Day 0 = estrus) of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6076b12561def45037631f24fe0dbe1d
https://doi.org/10.1095/biolreprod52.2.288

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Frequency of luteinizing hormone pulses and circulating 17β-oestradiol concentration in cows is related to concentration of progesterone in circulation when the progesterone comes from either an endogenous or exogenous source

Autor: F. N. Kojima, Roger J. Kittok, M. E. Wehrman, T. Sanchez, E. G. M. Bergfeld, K. E. Peters, M. Garcia-Winder, J. E. Kinder, V. Mariscal, Andrea S. Cupp

Publikováno v: Animal Reproduction Science. 37:257-265

The present study was designed to test whether progesterone from exogenous and endogenous sources modulates the frequency of luteinizing hormone (LH) pulses in a differential fashion. Our working hypotheses were: (1) the frequency of secretion of LH

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2b4712f37faa08bd35596a0c867c805
https://doi.org/10.1016/0378-4320(94)01341-i

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Melengestrol Acetate at Greater Doses than Typically Used for Estrous Synchrony in Bovine Females Does not Mimic Endogenous Progesterone in Regulation of Secretion Of Luteinizing Hormone and 17β-Estradiol1

Autor: J. R. Chenault, F. N. Kojima, E. G. M. Bergfeld, V. Mariscal, Roger J. Kittok, Andrea S. Cupp, J. E. Kinder, M. E. Wehrman, L. A. Werth, T. Sanchez

Publikováno v: Biology of Reproduction. 52:455-463

Our working hypothesis was that doses of melengestrol acetate (MGA) greater than those typically administered in estrous synchrony regimens would regulate secretion of LH and 17 beta-estradiol (E2) as endogenous progesterone (P4) does during the midl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7de73cc6ece067269b5b514598bb4859
https://doi.org/10.1095/biolreprod52.2.455

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