Effects of dominant follicle aspiration and treatment with recombinant bovine somatotropin (BST) on ovarian follicular development in Nelore (Bos indicus) heifers

dc.contributor.authorBuratini, J.
dc.contributor.authorPrice, C. A.
dc.contributor.authorVisintin, J. A.
dc.contributor.authorBo, G. A.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniv Montreal
dc.contributor.institutionCatholic Univ Cordoba
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:30:04Z
dc.date.available2014-05-20T15:30:04Z
dc.date.issued2000-08-01
dc.description.abstractFollicle ablation has been recognized as an efficient method of follicular wave synchronization. Treatment with recombinant bovine somatotropin (BST) has been shown to enhance follicular development in <(Bos taurus)under bar>. This experiment assessed the effects of these treatments in Nelore (<(B. indicus)under bar>) heifers. Eight cycling Nelore heifers were randomly assigned to 3 different treatments. on Day 2 of a synchronized cycle (Day 0 = day of ovulation), heifers assigned to Treatments 1 and 2 received 2 mL of saline, whereas heifers assigned to Treatment 3 received 320 mg of BST. on Day 5, the first-wave dominant follicle was ablated by ultrasoundguided transvaginal aspiration in heifers in Treatments 2 and 3, and all heifers received an injection of prostaglandin on Day 11. Aspiration of the dominant follicle advanced and synchronized (P < 0.05) the day of second-wave emergence (6.9 +/- 0.1 vs. 8.4 +/- 0.4) and the day of the pre-wave FSH peak (6.0 +/- 0.0 vs. 6.9 +/- 0.4), and increased FSH peak concentrations (381 +/- 21 vs. 292 +/- 30; pg/mL; P < 0.01). Recombinant bovine somatotropin treatment caused a two-fold increase in plasma insulin-like growth factor-I (IGF-I) concentrations (P < 0.001) and resulted in a 36% increase in the number of small follicles (<5 mm; P < 0.001) compared with saline-treated heifers. In summary, in agreement with previous reports on <(B. taurus)under bar>, dominant follicle aspiration synchronized ovarian follicular development, and BST treatment increased peripheral concentrations of IGF-I in Nelore heifers. Recombinant bovine somatotropin also increased the number of small follicles, but this response appeared to be inferior to that reported for <(B. taurus)under bar>. (C) 2000 by Elsevier B.V.en
dc.description.affiliationUniv São Paulo, Fac Vet Med, Dept Anim Reprod, São Paulo, Brazil
dc.description.affiliationUniv Montreal, Fac Vet Med, Res Ctr Anim Reprod, St Hyacinthe, PQ J2S 7C6, Canada
dc.description.affiliationCatholic Univ Cordoba, Inst Anim Reprod Cordoba, Cordoba, Argentina
dc.format.extent421-431
dc.identifierhttp://dx.doi.org/10.1016/S0093-691X(00)00359-9
dc.identifier.citationTheriogenology. New York: Elsevier B.V., v. 54, n. 3, p. 421-431, 2000.
dc.identifier.doi10.1016/S0093-691X(00)00359-9
dc.identifier.issn0093-691X
dc.identifier.urihttp://hdl.handle.net/11449/39516
dc.identifier.wosWOS:000089709100007
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofTheriogenology
dc.relation.ispartofjcr2.136
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectBos indicuspt
dc.subjectBSTpt
dc.subjectfolliclept
dc.subjectaspirationpt
dc.subjectIGF-Ipt
dc.titleEffects of dominant follicle aspiration and treatment with recombinant bovine somatotropin (BST) on ovarian follicular development in Nelore (Bos indicus) heifersen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.orcid0000-0002-6727-8280[2]

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