Výsledky vyhledávání

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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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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Secretion of gonadotrophins change during the luteal phase of the bovine oestrous cycle in the absence of corresponding changes in progesterone or 17β-oestradiol

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

Publikováno v: Animal Reproduction Science. 37:109-119

The hypothesis in the present study was that changes in circulating luteinizing hormone (LH) and follicle stimulating hormone (FSH) would occur during the luteal phase of the oestrous cycle (Days 4–19; Day 0, day of behaviourial oestrus) that were

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::faefea83ba18c64fc563a2dc5d1d8f1c
https://doi.org/10.1016/0378-4320(94)01333-h

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Increasing Exogenous Progesterone during Synchronization of Estrus Decreases Endogenous 17β-Estradiol and Increases Conception in Cows1

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

Publikováno v: Biology of Reproduction. 49:214-220

The objectives of this study were to determine the effects of dose of exogenous progesterone (P 4 ) prior to artificial insemination on concentrations of 17p-estradiol (E,) and on conception rates in bovine females. Heifers (n = 100) and cows (n = 10

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5e9707a7dc00b5a59a493c69ee9661d1
https://doi.org/10.1095/biolreprod49.2.214

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Yearling bulls shorten the duration of postpartum anestrus in beef cows to the same extent as do mature bulls1

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

Publikováno v: Journal of Animal Science. 71:306-309

The objective of this study was to determine whether yearling bulls, when pastured with cows, reduced the duration of postpartum anestrus to the same extent as did mature bulls. This experiment was conducted over a 3-yr period. Cows were stratified b

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0f8cb1b501eeda6bfe4fb98ac46affde
https://doi.org/10.2527/1993.712306x

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Environmental effects on neonatal mortality of beef calves

Autor: R. M. Koch, Larry V. Cundiff, K. E. Gregory, J. E. Kinder, L. A. Werth, Merlyn K. Nielsen, S. M. Azzam

Publikováno v: Journal of Animal Science. 71:282-290

Calving records from 1969 to 1989 from the Roman L. Hruska U.S. Meat Animal Research Center were used to investigate how climatic conditions, in addition to dystocia, age of dam, size of calf, and sex affect calf survival from birth to 1 wk of age. D

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::026a4517e8d83632ccf184c1251e6996
https://doi.org/10.2527/1993.712282x

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Exogenous Progesterone and Progestins as Used in Estrous Synchrony Regimens do not Mimic the Corpus Luteum in Regulation of Luteinizing Hormone and 17β-Estradiol in Circulation of Cows1

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

Publikováno v: Biology of Reproduction. 47:1009-1017

Our working hypothesis was that the low concentrations of progesterone (P4) and synthetic progestins administered in hormonal regimens to control estrous cycles of cows would have similar effects on secretion of LH and 17 beta-estradiol (E2). In addi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b44de8cae86163246517f91ff1582508
https://doi.org/10.1095/biolreprod47.6.1009

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

Publikováno v: Biology of Reproduction. 46:442-450

Our working hypotheses forthis study were that 1) the profile of intrapituitary LH and FSH isoforms would be shifted toward acidic forms as sexual maturation progresses in the bovine female; and 2) concentration of 17(�-estradiol (E,) in circulatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dd12f277c118c716957de493a4c841d2
https://doi.org/10.1095/biolreprod46.3.442

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