Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant

Two experiments were designed to evaluate the effects of estradiol-17β (E-17β) on follicular wave dynamics and gonadotropin in cattle. The first experiment was designed to evaluate the effect of 5 mg E-17β administered on Day 1 (ovulation=Day 0) in heifers with or without a progestogen (SMB) ear imp...

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Autores principales: Bo, G.A., Adams, G.P., Pierson, R.A., Tribulo, Humberto Elías, Caccia, M., Mapletoft, R.J.
Formato: Artículo
Lenguaje:Español
Publicado: 1994
Materias:
SB Cultura de la planta
Acceso en línea:http://pa.bibdigital.ucc.edu.ar/3713/1/A_Bo_Adams_Pierson_Tribulo_Caccia_Mapletoft.pdf
Aporte de:
Producción Académica Universidad Católica de Córdoba (UCCor) de Universidad Católica de Córdoba
id I38-R144-3713
record_format dspace
spelling I38-R144-37132025-04-07T20:44:41Z http://pa.bibdigital.ucc.edu.ar/3713/ Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant Bo, G.A. Adams, G.P. Pierson, R.A. Tribulo, Humberto Elías Caccia, M. Mapletoft, R.J. SB Cultura de la planta Two experiments were designed to evaluate the effects of estradiol-17β (E-17β) on follicular wave dynamics and gonadotropin in cattle. The first experiment was designed to evaluate the effect of 5 mg E-17β administered on Day 1 (ovulation=Day 0) in heifers with or without a progestogen (SMB) ear implant. The dominant follicle in heifers treated with E-17β+SMB ceased to grow 1 d after E-17β treatment and subsequently regressed resulting in early emergence of the next follicular wave. Conversely, E-17β treatment of non-implanted heifers resulted in transient or incomplete suppression of the dominant follicle, and delayed emergence of the next follicular wave (P<0.05). A post-treatment surge in plasma LH concentration was detected in 5 of 6 heifers treated with E-17β alone versus 1 of 6 treated with E-17β+SMB (P<0.05). In all but 1 heifer, the LH surge was accompanied by a concurrent FSH surge (18 to 36 h after E-17β). The second experiment was designed to determine an effective dosage regimen of E-17β for suppression of follicular growth in SMB-implanted heifers and to test the hypothesis that estradiol-induced follicle suppression will result in a synchronous emergence of the subsequent follicular wave. On Day 0,48 heifers were implanted with SMB and allocated to 1 of 7 treatment groups: control heifers, and those that received 10 mg or 5 mg E-17β i.m. on Day 1 or Day 3; or 2.5 mg E-17β b.i.d. on Days 1 to 3 or Days 3 to 5. The growth of the dominant follicle of the first follicular wave was suppressed in all the E-17β treated groups. Emergence of the second follicular wave was later (P<0.05) in control heifers than heifers treated with a single injection of E-17β on Day 1, but was not different from heifers treated on Day 3. Furthermore, the day of wave emergence was less variable (P<0.05) in heifers treated with 5 mg of E-17β than in control heifers. It was concluded that E-17β and progestogen treatment may be used to suppress follicular growth and cause the synchronous emergence of a new follicular wave in cattle. 1994-12-31 info:eu-repo/semantics/article info:eu-repo/semantics/closedAccess application/pdf spa http://pa.bibdigital.ucc.edu.ar/3713/1/A_Bo_Adams_Pierson_Tribulo_Caccia_Mapletoft.pdf Bo, G.A., Adams, G.P., Pierson, R.A., Tribulo, Humberto Elías ORCID: https://orcid.org/0000-0002-3192-1959 <https://orcid.org/0000-0002-3192-1959>, Caccia, M. and Mapletoft, R.J. (1994) Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant. Theriogenology, 41 (8). pp. 1555-1569. ISSN 0093-691X info:eu-repo/semantics/altIdentifier/doi/10.1016/0093-691X(94)90821-Y
institution Universidad Católica de Córdoba
institution_str I-38
repository_str R-144
collection Producción Académica Universidad Católica de Córdoba (UCCor)
language Español
orig_language_str_mv spa
topic SB Cultura de la planta
spellingShingle SB Cultura de la planta
Bo, G.A.
Adams, G.P.
Pierson, R.A.
Tribulo, Humberto Elías
Caccia, M.
Mapletoft, R.J.
Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant
topic_facet SB Cultura de la planta
description Two experiments were designed to evaluate the effects of estradiol-17β (E-17β) on follicular wave dynamics and gonadotropin in cattle. The first experiment was designed to evaluate the effect of 5 mg E-17β administered on Day 1 (ovulation=Day 0) in heifers with or without a progestogen (SMB) ear implant. The dominant follicle in heifers treated with E-17β+SMB ceased to grow 1 d after E-17β treatment and subsequently regressed resulting in early emergence of the next follicular wave. Conversely, E-17β treatment of non-implanted heifers resulted in transient or incomplete suppression of the dominant follicle, and delayed emergence of the next follicular wave (P<0.05). A post-treatment surge in plasma LH concentration was detected in 5 of 6 heifers treated with E-17β alone versus 1 of 6 treated with E-17β+SMB (P<0.05). In all but 1 heifer, the LH surge was accompanied by a concurrent FSH surge (18 to 36 h after E-17β). The second experiment was designed to determine an effective dosage regimen of E-17β for suppression of follicular growth in SMB-implanted heifers and to test the hypothesis that estradiol-induced follicle suppression will result in a synchronous emergence of the subsequent follicular wave. On Day 0,48 heifers were implanted with SMB and allocated to 1 of 7 treatment groups: control heifers, and those that received 10 mg or 5 mg E-17β i.m. on Day 1 or Day 3; or 2.5 mg E-17β b.i.d. on Days 1 to 3 or Days 3 to 5. The growth of the dominant follicle of the first follicular wave was suppressed in all the E-17β treated groups. Emergence of the second follicular wave was later (P<0.05) in control heifers than heifers treated with a single injection of E-17β on Day 1, but was not different from heifers treated on Day 3. Furthermore, the day of wave emergence was less variable (P<0.05) in heifers treated with 5 mg of E-17β than in control heifers. It was concluded that E-17β and progestogen treatment may be used to suppress follicular growth and cause the synchronous emergence of a new follicular wave in cattle.
format Artículo
author Bo, G.A.
Adams, G.P.
Pierson, R.A.
Tribulo, Humberto Elías
Caccia, M.
Mapletoft, R.J.
author_facet Bo, G.A.
Adams, G.P.
Pierson, R.A.
Tribulo, Humberto Elías
Caccia, M.
Mapletoft, R.J.
author_sort Bo, G.A.
title Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant
title_short Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant
title_full Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant
title_fullStr Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant
title_full_unstemmed Follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant
title_sort follicular wave dynamics after estradiol-17β treatment of heifers with or without a progestogen implant
publishDate 1994
url http://pa.bibdigital.ucc.edu.ar/3713/1/A_Bo_Adams_Pierson_Tribulo_Caccia_Mapletoft.pdf
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AT tribulohumbertoelias follicularwavedynamicsafterestradiol17btreatmentofheiferswithorwithoutaprogestogenimplant
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