Use este identificador para citar ou linkar para este item: https://repositorio.ufma.br/jspui/handle/123456789/764
Registro completo de metadados
Campo DCValorIdioma
dc.contributor.authorMARTINS, J. H.-
dc.contributor.authorSANTOS, C. S.-
dc.contributor.authorSILVA, M. A. V.-
dc.contributor.authorAGUIAR, H. M. V. S. B-
dc.contributor.authorFRANÇA, I. G.-
dc.contributor.authorPEREIRA, H. G.-
dc.contributor.authorRIBEIRO, D. L.-
dc.contributor.authorCHAVES, R. M.-
dc.contributor.authorSOUZA, J. A. T.-
dc.contributor.authorMONTEIRO, B. M.-
dc.contributor.authorSÁ FILHO, M. F.-
dc.contributor.authorTORRES JUNIOR, José Ribamar de Souza-
dc.date.accessioned2018-02-01T20:40:41Z-
dc.date.available2018-02-01T20:40:41Z-
dc.date.issued2015-
dc.identifier.citationMARTINS, J. H. et al. Impact of puberty status and melengestrol acetate supplementation before the breeding period on reproductive efficiency of Bos indicus beef heifers. J. Anim. Sci. v. 93, n. 6, p. 2796-2805, Jun. 2015. DOI: 10.2527/jas.2015-8799pt_br
dc.identifier.issn1525-3163-
dc.identifier.urihttp://hdl.handle.net/123456789/764-
dc.description.abstractTwo experiments were designed to evaluate the impact of puberty status and the administration of melengestrol acetate (MGA) before onset of the breeding period on ovulatory responses (Exp. 1) and conception rate after AI performed on estrus detection during 10 d and the pregnancy rate through 80 d of breeding period (Exp. 2) of pasture-grazed beef heifers. In Exp. 1, heifers (15 pubertal and 15 prepubertal) received 0.5 mg per heifer/d -1 of MGA over 14 d. No differences in the ovulatory responses were found 10 d after the MGA administration (pubertal = 46.7% vs. prepubertal P = 53.3%; P = 0.72). In Exp. 2, 368 heifers were randomly assigned to groups according to pubertal status and the MGA treatment. All heifers were inseminated on estrus detection for up 10 d after MGA administration and following exposure to bulls between 20 and 80 d. The MGA-treated heifers exhibited a greater AI service rate than control heifers (72.1 vs. 41.6%;P < 0.01); however, heifers receiving MGA had lower conception results following AI (51.6 vs. 71.4%; P = 0.01). In addition, MGA-treated heifers were more likely to have a corpus luteum in the middle of the breeding period (95.3 vs. 87.5%;P < 0.01), although the Cox proportional hazard of pregnancy rate was similar (P = 0.29) at the end of the breeding period. At onset of the breeding period, pubertal heifers presented a greater pregnancy rate following AI (pubertal P = 42.2% vs. prepubertal P = 24.9%; P = 0.01). Therefore, pubertal heifers seem to have greater overall reproductive efficiency than prepubertal heifers, particularly at the beginning of the breeding period. Interestingly, administration of MGA before the onset of the breeding period increased AI service rate but did not alter the rate of pregnancy throughout the breeding period of pasture-grazed beef heifers.pt_br
dc.language.isoenpt_br
dc.publisherAmerican Society of Animal Sciencept_br
dc.subjectArtificial inseminationpt_br
dc.subjectCyclicitypt_br
dc.subjectFollicular dynamicspt_br
dc.subjectHeiferspt_br
dc.subjectProgestinpt_br
dc.titleImpact of puberty status and melengestrol acetate supplementation before the breeding period on reproductive efficiency of Bos indicus beef heiferspt_br
dc.typeArticlept_br
Aparece nas coleções:Artigos - Zootecnia

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
Impact of puberty status and melengestrol acetate supplementation.pdfArtigo442,74 kBAdobe PDFVisualizar/Abrir


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.