Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)

Detalhes bibliográficos
Autor(a) principal: Ungerfeld, Rodolfo
Data de Publicação: 2020
Outros Autores: Kako Rodriguez, Mariana Garcia [UNESP], Perez-Clariget, Raquel
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.anireprosci.2020.106642
http://hdl.handle.net/11449/209706
Resumo: The aim of the first experiment was to determine if follicular growth rate in ewes increases spontaneously or after gonadotropin administration after lamb weaning during the period of seasonal anestrus. To conduct this experiment, there were postpartum lactating ewes from which lambs were or were not weaned when 68 to 72 days old (Day 0). The ovaries were assessed using ultrasonography from Day 0 to 9, followed by the administration of 200 IU of eCG on Day 7 to all ewes to determine capacity of follicles to respond to gonadotropin stimulation. There were no differences in duration of follicular wave dynamics, or maximum dominant follicle diameter during the first follicular wave after lamb weaning or after administration of eCG. Because weaning did not have positive effects on follicular development, the aim of the second study was to compare responses to placement of rams with lactating ewes (47 or 68 days postpartum; PP47 and PP68, respectively) and seasonal anestrous ewes that lambed during the previous year (Control). There were no differences in the proportion of ewes of the three groups that developed a corpus luteum after placement with rams, but more ewes of the Control than PP47 and PP68 groups expressed behavioral estrus and lambed as a result of placement of ewes with rams (P < 0.0001). In extensive grazing management systems, weaning of lambs did not modify spontaneous or induced follicular growth in Corriedale ewes that lambed in the spring. The placement of rams with ewes resulted in induction of ovulations, estrus and pregnancies even when ewes have lambs suckling.
id UNSP_1b44023b56b105f8b4e10ff52b3d99fd
oai_identifier_str oai:repositorio.unesp.br:11449/209706
network_acronym_str UNSP
network_name_str Repositório Institucional da UNESP
repository_id_str 2946
spelling Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)FollicleLactational anestrusSeasonalityReproductive performanceThe aim of the first experiment was to determine if follicular growth rate in ewes increases spontaneously or after gonadotropin administration after lamb weaning during the period of seasonal anestrus. To conduct this experiment, there were postpartum lactating ewes from which lambs were or were not weaned when 68 to 72 days old (Day 0). The ovaries were assessed using ultrasonography from Day 0 to 9, followed by the administration of 200 IU of eCG on Day 7 to all ewes to determine capacity of follicles to respond to gonadotropin stimulation. There were no differences in duration of follicular wave dynamics, or maximum dominant follicle diameter during the first follicular wave after lamb weaning or after administration of eCG. Because weaning did not have positive effects on follicular development, the aim of the second study was to compare responses to placement of rams with lactating ewes (47 or 68 days postpartum; PP47 and PP68, respectively) and seasonal anestrous ewes that lambed during the previous year (Control). There were no differences in the proportion of ewes of the three groups that developed a corpus luteum after placement with rams, but more ewes of the Control than PP47 and PP68 groups expressed behavioral estrus and lambed as a result of placement of ewes with rams (P < 0.0001). In extensive grazing management systems, weaning of lambs did not modify spontaneous or induced follicular growth in Corriedale ewes that lambed in the spring. The placement of rams with ewes resulted in induction of ovulations, estrus and pregnancies even when ewes have lambs suckling.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Univ Republica, Fac Vet, Dept Biociencias Vet, Lasplaces 1620, Montevideo 11600, UruguayUniv Estadual Paulista, Fac Ciencias Agr & Vet, Dept Med Vet Prevent & Reprod Anim, BR-14884900 Sao Paulo, BrazilUniv Republica, Fac Agron, Dept Prod Anim & Pasturas, Garzon 780, Montevideo 12400, UruguayUniv Estadual Paulista, Fac Ciencias Agr & Vet, Dept Med Vet Prevent & Reprod Anim, BR-14884900 Sao Paulo, BrazilCAPES: 001Elsevier B.V.Univ RepublicaUniversidade Estadual Paulista (Unesp)Ungerfeld, RodolfoKako Rodriguez, Mariana Garcia [UNESP]Perez-Clariget, Raquel2021-06-25T12:26:34Z2021-06-25T12:26:34Z2020-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article6http://dx.doi.org/10.1016/j.anireprosci.2020.106642Animal Reproduction Science. Amsterdam: Elsevier, v. 223, 6 p., 2020.0378-4320http://hdl.handle.net/11449/20970610.1016/j.anireprosci.2020.106642WOS:000593091900014Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAnimal Reproduction Scienceinfo:eu-repo/semantics/openAccess2024-06-06T18:10:00Zoai:repositorio.unesp.br:11449/209706Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:34:22.055090Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)
title Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)
spellingShingle Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)
Ungerfeld, Rodolfo
Follicle
Lactational anestrus
Seasonality
Reproductive performance
title_short Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)
title_full Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)
title_fullStr Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)
title_full_unstemmed Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)
title_sort Reproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)
author Ungerfeld, Rodolfo
author_facet Ungerfeld, Rodolfo
Kako Rodriguez, Mariana Garcia [UNESP]
Perez-Clariget, Raquel
author_role author
author2 Kako Rodriguez, Mariana Garcia [UNESP]
Perez-Clariget, Raquel
author2_role author
author
dc.contributor.none.fl_str_mv Univ Republica
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Ungerfeld, Rodolfo
Kako Rodriguez, Mariana Garcia [UNESP]
Perez-Clariget, Raquel
dc.subject.por.fl_str_mv Follicle
Lactational anestrus
Seasonality
Reproductive performance
topic Follicle
Lactational anestrus
Seasonality
Reproductive performance
description The aim of the first experiment was to determine if follicular growth rate in ewes increases spontaneously or after gonadotropin administration after lamb weaning during the period of seasonal anestrus. To conduct this experiment, there were postpartum lactating ewes from which lambs were or were not weaned when 68 to 72 days old (Day 0). The ovaries were assessed using ultrasonography from Day 0 to 9, followed by the administration of 200 IU of eCG on Day 7 to all ewes to determine capacity of follicles to respond to gonadotropin stimulation. There were no differences in duration of follicular wave dynamics, or maximum dominant follicle diameter during the first follicular wave after lamb weaning or after administration of eCG. Because weaning did not have positive effects on follicular development, the aim of the second study was to compare responses to placement of rams with lactating ewes (47 or 68 days postpartum; PP47 and PP68, respectively) and seasonal anestrous ewes that lambed during the previous year (Control). There were no differences in the proportion of ewes of the three groups that developed a corpus luteum after placement with rams, but more ewes of the Control than PP47 and PP68 groups expressed behavioral estrus and lambed as a result of placement of ewes with rams (P < 0.0001). In extensive grazing management systems, weaning of lambs did not modify spontaneous or induced follicular growth in Corriedale ewes that lambed in the spring. The placement of rams with ewes resulted in induction of ovulations, estrus and pregnancies even when ewes have lambs suckling.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-01
2021-06-25T12:26:34Z
2021-06-25T12:26:34Z
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://dx.doi.org/10.1016/j.anireprosci.2020.106642
Animal Reproduction Science. Amsterdam: Elsevier, v. 223, 6 p., 2020.
0378-4320
http://hdl.handle.net/11449/209706
10.1016/j.anireprosci.2020.106642
WOS:000593091900014
url http://dx.doi.org/10.1016/j.anireprosci.2020.106642
http://hdl.handle.net/11449/209706
identifier_str_mv Animal Reproduction Science. Amsterdam: Elsevier, v. 223, 6 p., 2020.
0378-4320
10.1016/j.anireprosci.2020.106642
WOS:000593091900014
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Animal Reproduction Science
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 6
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
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_ 1808129337670500352