Is the Santa Inês sheep a typical non-seasonal breeder in the Brazilian Southeast?

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Autor(es): dc.contributorUniversidade Federal Fluminense (UFF)-
Autor(es): dc.contributorUniversidade do Estado de São Paulo-
Autor(es): dc.contributorEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)-
Autor(es): dc.creatorBalaro, Mario Felipe Alvarez-
Autor(es): dc.creatorda Fonseca, Jeferson Ferreira-
Autor(es): dc.creatorOba, Eunice-
Autor(es): dc.creatorda Cruz Cardoso, Elyzabeth-
Autor(es): dc.creatorBrandão, Felipe Zandonadi-
Data de aceite: dc.date.accessioned2025-08-21T19:13:20Z-
Data de disponibilização: dc.date.available2025-08-21T19:13:20Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2014-11-16-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1007/s11250-014-0672-8-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/231343-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/231343-
Descrição: dc.descriptionThis study aimed to characterize the annual reproductive cycle of Santa Inês sheep in the Fluminense lowland region (latitude 22° 27′ 45″ south, Rio de Janeiro, Brazil) between September 2011 and August 2012. Ten ewes were maintained in a semi-intensive system under natural photoperiods with access to pasture and shelter. Blood samples were collected every 2 weeks to determine plasma progesterone concentrations. The body condition score (BCS) was determined each month. There was no seasonal variation in the plasma progesterone concentration from the months of September to January, April, and May to August. In the months of February and April, the plasma hormone levels were higher than August to November. Seventy percent (7/10) of the sheep studied had short seasonal anestrus. The periods of anestrus were concentrated between the months of September and December (spring season) in 85.7 % (6/7) of the cases evaluated. In these cases, 57.1 % (4/7) also had short periods of reproductive inactivity during other months of the year. The progesterone values obtained in the spring corroborate the higher reproductive anestrus observed in this season. Higher plasma progesterone values were found in summer and autumn with reduction in the winter to lower values in the spring. No changes in the BCS during the study period were observed. Under the studied conditions, the Santa Inês sheep showed a low degree of reproductive seasonality. However, some individual ewes had seasonal anestrus during the spring. Further studies that include management techniques are needed to improve reproductive efficiency without hormone therapy in this breed under tropical conditions.-
Descrição: dc.descriptionDepartment of Pathology and Clinical Veterinary Veterinary School Universidade Federal Fluminense, Vital Brasil street, no. 64-
Descrição: dc.descriptionDepartment of Animal Reproduction and Veterinary Radiology Veterinary School Universidade do Estado de São Paulo, Distrito de Rubião Junior, s/n-
Descrição: dc.descriptionEmbrapa Goats and Sheep, MG 133-
Formato: dc.format1533-1537-
Idioma: dc.languageen-
Relação: dc.relationTropical Animal Health and Production-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCyclicity-
Palavras-chave: dc.subjectProgesterone-
Palavras-chave: dc.subjectReproductive seasonality-
Palavras-chave: dc.subjectTropical hair sheep-
Título: dc.titleIs the Santa Inês sheep a typical non-seasonal breeder in the Brazilian Southeast?-
Tipo de arquivo: dc.typelivro digital-
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