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Progestagen treatment associated with different doses of eCG to advance the breeding season in Churra Galega Bragançana ewes

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dc.contributor.authorValentim, Ramiro
dc.contributor.authorAzevedo, Jorge
dc.contributor.authorMendonça, Álvaro
dc.contributor.authorFontes, Paulo
dc.contributor.authorGalvão, Lurdes
dc.contributor.authorCardoso, Manuel
dc.contributor.authorVelasco, Helena
dc.contributor.authorMaurício, Raimundo
dc.contributor.authorCorreia, Teresa Montenegro
dc.date.accessioned2011-05-26T16:30:40Z
dc.date.available2011-05-26T16:30:40Z
dc.date.issued2010
dc.description.abstractIn order to assess the effects of a long-term progestagen treatment associated with different doses of eCG (equine Chorionic Gonadotropin) to advance the breeding season in Portuguese Churra Galega Bragançana ewes, an initial group of 41 females (2 were later rejected) aged between 2 and 7 years was used. In middle May, all ewes were treated with an intravaginal sponge impregnated with 20 mg of fluorogestone acetate (FGA) for 12 days. Half ewes received an injection (i.m.) of 500 UI of eCG and the other half an injection (i.m.) of 750 UI of eCG at sponge removal time. Blood samples were taken for progesterone determination and 4 intact rams with harness marker were used to identify the estrus. A transrectal ultrasound scanning was performed for pregnancy diagnosis. In early May, 63.4% of all ewes were in seasonal anoestrous. Treatments resulted in 97.4% ewes in estrus and 89.7% ewes with corpora lutea (CL) (Chi2 = 60.595; P<0.001). The higher dose of eCG had a positive effect in estrus (94.4% vs. 100.0%; Chi2 = 6.186; P<0.05) and pregnancy (61.1% vs. 81.0%; Chi2 = 9.713; P<0.01) and fertility (61.1% vs. 76.2%; Chi2 = 5.214; P<0.05) rates. The eCG dose had no effect in ewes with CL (88.9% vs. 90.5%; Chi2 = 0.053; P>0.05) and prolificacy (1.5 ± 0.8 vs. 1.7 ± 0.6; P>0.05). In conclusion, a long-term FGA treatment may be used to advance the breeding season in Churra Galega Bragançana ewes and the reproductive response depends on the eCG dose.por
dc.identifier.citationValentim, Ramiro; Azevedo, J.; Mendonça, Álvaro; Fontes, P.; Galvão, Lurdes; Cardoso, Manuel; Velasco, Helena; Maurício, Raimundo; Correia, Teresa (2010). Progestagen treatment associated with different doses of eCG to advance the breeding season in Churra Galega Bragançana ewes. Reproduction in Domestic Animals. ISSN 0936-6768. 45:Suppl. 3, p. 110por
dc.identifier.issn0936-6768
dc.identifier.urihttp://hdl.handle.net/10198/4610
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherWileypor
dc.titleProgestagen treatment associated with different doses of eCG to advance the breeding season in Churra Galega Bragançana ewespor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.endPage110por
oaire.citation.startPage110por
oaire.citation.titleReproduction in Domestic Animalspor
person.familyNameValentim
person.familyNameMendonça
person.familyNameMaurício
person.familyNameCorreia
person.givenNameRamiro
person.givenNameÁlvaro
person.givenNameRaimundo
person.givenNameTeresa Montenegro
person.identifier.ciencia-idB01B-96FF-D524
person.identifier.ciencia-id8A1F-7B31-A119
person.identifier.ciencia-id1610-5AFD-75A1
person.identifier.orcid0000-0002-3514-988X
person.identifier.orcid0000-0002-4099-9547
person.identifier.orcid0000-0002-9640-8320
person.identifier.ridK-2190-2014
person.identifier.scopus-author-id36607620800
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
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relation.isAuthorOfPublication94a7121f-3469-4d32-98c6-e8e06bd4637e
relation.isAuthorOfPublication18be4d07-9fbf-409a-b0a9-c78af6b49b19
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relation.isAuthorOfPublication.latestForDiscovery18be4d07-9fbf-409a-b0a9-c78af6b49b19

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