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)

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniv Republica-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorUngerfeld, Rodolfo-
Autor(es): dc.creatorKako Rodriguez, Mariana Garcia [UNESP]-
Autor(es): dc.creatorPerez-Clariget, Raquel-
Data de aceite: dc.date.accessioned2022-02-22T00:57:24Z-
Data de disponibilização: dc.date.available2022-02-22T00:57:24Z-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2020-11-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.anireprosci.2020.106642-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/209706-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/209706-
Descrição: dc.descriptionThe 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.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionUniv Republica, Fac Vet, Dept Biociencias Vet, Lasplaces 1620, Montevideo 11600, Uruguay-
Descrição: dc.descriptionUniv Estadual Paulista, Fac Ciencias Agr & Vet, Dept Med Vet Prevent & Reprod Anim, BR-14884900 Sao Paulo, Brazil-
Descrição: dc.descriptionUniv Republica, Fac Agron, Dept Prod Anim & Pasturas, Garzon 780, Montevideo 12400, Uruguay-
Descrição: dc.descriptionUniv Estadual Paulista, Fac Ciencias Agr & Vet, Dept Med Vet Prevent & Reprod Anim, BR-14884900 Sao Paulo, Brazil-
Descrição: dc.descriptionCAPES: 001-
Formato: dc.format6-
Idioma: dc.languageen-
Publicador: dc.publisherElsevier B.V.-
Relação: dc.relationAnimal Reproduction Science-
???dc.source???: dc.sourceWeb of Science-
Palavras-chave: dc.subjectFollicle-
Palavras-chave: dc.subjectLactational anestrus-
Palavras-chave: dc.subjectSeasonality-
Palavras-chave: dc.subjectReproductive performance-
Título: dc.titleReproductive response of postpartum spring-lambing ewes: effects of weaning on follicular growth and postpartum interval on response to ram placement with ewes (ram effect)-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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