Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone
Autor(a) principal: | |
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Data de Publicação: | 1996 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://www.animal-science.org/content/74/5/1074.short http://hdl.handle.net/11449/39040 |
Resumo: | A series of experiments with Holstein heifers was conducted to develop the capability of inducing accessory corpus luteum (CL) with a GnRH agonist (Buserelin, 8 mu g; GnRHa) or hCG; (3,000 IU) to increase plasma progesterone concentrations (Exp. 1, 2, and 3) and to test whether induction of accessory CL with hCG will increase conception rates in heifers (Exp. 4) and lactating cows (Exp. 5). In Exp. 1, heifers were treated on d 5 after estrus with GnRHa (n = 8) or saline (n = 7); heifers in Exp. 2 received hCG (n = 5) or saline (n = 4) on d 5. Experiment 3 allowed a contemporary evaluation of heifers treated on d 5 with GnRHa (n = 6), hCG (n = 6), saline (n = 6), or GnRHa at d 5 and hCG at the time of the induced ovulation (n = 5). The GnRHa and hCG were equally effective in inducing an accessory CL (93% induction rate), but the subsequent increase in progesterone concentrations was greater in hCG-treated heifers. A greater half life of hCG may provide longer LH-like stimulation of the first-wave follicle and subsequent developing accessory CL or a greater luteotropic effect on the original CL. Induction of an accessory CL with hCG on d 5 or 6 after insemination did not increase pregnancy rates in fertile heifers (Exp. 4: hCG = 64.8% vs control = 62.9%; n = 243) or lactating dairy cows during summer heat stress (Exp. 5: hCG = 24.2% vs control = 23.5%; n = 201). |
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Repositório Institucional da UNESP |
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2946 |
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Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormonehCGGnRH agonistcorpus luteumfolliclesprogesteronefertilityA series of experiments with Holstein heifers was conducted to develop the capability of inducing accessory corpus luteum (CL) with a GnRH agonist (Buserelin, 8 mu g; GnRHa) or hCG; (3,000 IU) to increase plasma progesterone concentrations (Exp. 1, 2, and 3) and to test whether induction of accessory CL with hCG will increase conception rates in heifers (Exp. 4) and lactating cows (Exp. 5). In Exp. 1, heifers were treated on d 5 after estrus with GnRHa (n = 8) or saline (n = 7); heifers in Exp. 2 received hCG (n = 5) or saline (n = 4) on d 5. Experiment 3 allowed a contemporary evaluation of heifers treated on d 5 with GnRHa (n = 6), hCG (n = 6), saline (n = 6), or GnRHa at d 5 and hCG at the time of the induced ovulation (n = 5). The GnRHa and hCG were equally effective in inducing an accessory CL (93% induction rate), but the subsequent increase in progesterone concentrations was greater in hCG-treated heifers. A greater half life of hCG may provide longer LH-like stimulation of the first-wave follicle and subsequent developing accessory CL or a greater luteotropic effect on the original CL. Induction of an accessory CL with hCG on d 5 or 6 after insemination did not increase pregnancy rates in fertile heifers (Exp. 4: hCG = 64.8% vs control = 62.9%; n = 243) or lactating dairy cows during summer heat stress (Exp. 5: hCG = 24.2% vs control = 23.5%; n = 201).UNIV FLORIDA,DEPT DAIRY & POULTRY SCI,GAINESVILLE,FL 32611UNIV FLORIDA,DEPT LARGE ANIM CLIN SCI,GAINESVILLE,FL 32611UNESP,DEPT PHARMACOL,BR-18600 SAO PAULO,BRAZILS FLORIDA CTR FERTIL,MIAMI,FL 33143UNESP,DEPT PHARMACOL,BR-18600 SAO PAULO,BRAZILAmer Soc Animal ScienceUNIV FLORIDAUniversidade Estadual Paulista (Unesp)S FLORIDA CTR FERTILSchmitt, EJPDiaz, T.Barros, C. M.delaSota, R. L.Drost, M.Fredriksson, E. W.Staples, C. R.Thorner, R.Thatcher, W. W.2014-05-20T15:29:26Z2014-05-20T15:29:26Z1996-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1074-1083http://www.animal-science.org/content/74/5/1074.shortJournal of Animal Science. Savoy: Amer Soc Animal Science, v. 74, n. 5, p. 1074-1083, 1996.0021-8812http://hdl.handle.net/11449/39040WOS:A1996UJ93100019Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Animal Science1.7110,848info:eu-repo/semantics/openAccess2021-10-23T10:40:56Zoai:repositorio.unesp.br:11449/39040Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T10:40:56Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone |
title |
Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone |
spellingShingle |
Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone Schmitt, EJP hCG GnRH agonist corpus luteum follicles progesterone fertility |
title_short |
Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone |
title_full |
Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone |
title_fullStr |
Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone |
title_full_unstemmed |
Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone |
title_sort |
Differential response of the luteal phase and fertility in cattle following ovulation of the first-wave follicle with human chorionic gonadotropin or an agonist of gonadotropin-releasing hormone |
author |
Schmitt, EJP |
author_facet |
Schmitt, EJP Diaz, T. Barros, C. M. delaSota, R. L. Drost, M. Fredriksson, E. W. Staples, C. R. Thorner, R. Thatcher, W. W. |
author_role |
author |
author2 |
Diaz, T. Barros, C. M. delaSota, R. L. Drost, M. Fredriksson, E. W. Staples, C. R. Thorner, R. Thatcher, W. W. |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
UNIV FLORIDA Universidade Estadual Paulista (Unesp) S FLORIDA CTR FERTIL |
dc.contributor.author.fl_str_mv |
Schmitt, EJP Diaz, T. Barros, C. M. delaSota, R. L. Drost, M. Fredriksson, E. W. Staples, C. R. Thorner, R. Thatcher, W. W. |
dc.subject.por.fl_str_mv |
hCG GnRH agonist corpus luteum follicles progesterone fertility |
topic |
hCG GnRH agonist corpus luteum follicles progesterone fertility |
description |
A series of experiments with Holstein heifers was conducted to develop the capability of inducing accessory corpus luteum (CL) with a GnRH agonist (Buserelin, 8 mu g; GnRHa) or hCG; (3,000 IU) to increase plasma progesterone concentrations (Exp. 1, 2, and 3) and to test whether induction of accessory CL with hCG will increase conception rates in heifers (Exp. 4) and lactating cows (Exp. 5). In Exp. 1, heifers were treated on d 5 after estrus with GnRHa (n = 8) or saline (n = 7); heifers in Exp. 2 received hCG (n = 5) or saline (n = 4) on d 5. Experiment 3 allowed a contemporary evaluation of heifers treated on d 5 with GnRHa (n = 6), hCG (n = 6), saline (n = 6), or GnRHa at d 5 and hCG at the time of the induced ovulation (n = 5). The GnRHa and hCG were equally effective in inducing an accessory CL (93% induction rate), but the subsequent increase in progesterone concentrations was greater in hCG-treated heifers. A greater half life of hCG may provide longer LH-like stimulation of the first-wave follicle and subsequent developing accessory CL or a greater luteotropic effect on the original CL. Induction of an accessory CL with hCG on d 5 or 6 after insemination did not increase pregnancy rates in fertile heifers (Exp. 4: hCG = 64.8% vs control = 62.9%; n = 243) or lactating dairy cows during summer heat stress (Exp. 5: hCG = 24.2% vs control = 23.5%; n = 201). |
publishDate |
1996 |
dc.date.none.fl_str_mv |
1996-05-01 2014-05-20T15:29:26Z 2014-05-20T15:29:26Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.animal-science.org/content/74/5/1074.short Journal of Animal Science. Savoy: Amer Soc Animal Science, v. 74, n. 5, p. 1074-1083, 1996. 0021-8812 http://hdl.handle.net/11449/39040 WOS:A1996UJ93100019 |
url |
http://www.animal-science.org/content/74/5/1074.short http://hdl.handle.net/11449/39040 |
identifier_str_mv |
Journal of Animal Science. Savoy: Amer Soc Animal Science, v. 74, n. 5, p. 1074-1083, 1996. 0021-8812 WOS:A1996UJ93100019 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Animal Science 1.711 0,848 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1074-1083 |
dc.publisher.none.fl_str_mv |
Amer Soc Animal Science |
publisher.none.fl_str_mv |
Amer Soc Animal Science |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1797789792091504640 |