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Escolher formato: Padrão Ficha Formato Reduzido Nomes MARC Campos MARC
No. Registro   002421703
Tipo de material   ARTIGO DE PERIODICO - INTERNACIONAL
Cód. publicação   Link10.1016/j.theriogenology.2013.09.027 DOI
Entrada Principal   LinkSá Filho, Manoel Francisco de (*) NAC
Título   LinkResynchronization with unknown pregnancy status using progestin-based timed artificial insemination protocol in beef cattle.
Imprenta   Nova York, 2014.
Descrição   p. 284-290.
Idioma   Inglês
Nota   Disponível em: <http://dx.doi.org/10.1016/j.theriogenology.2013.09.027>. Acesso em: 07 jan. 2014
Nota Local   Fator de Impacto: 1.798
  Na FMVZ, ver acervo: BAP-652 Documento Digital
Assunto   LinkGADO
  LinkINSEMINAÇÃO ARTIFICIAL ANIMAL
  LinkREPRODUÇÃO ANIMAL
Autor Secundário   LinkMarques, M. O. (*) NAC Geraembryo. Cornélio Procópio, PR
  LinkGirotto, R. (*) NAC RG Genética Avançada. Agua Boa, MT
  LinkSantos, F. A. (*) NAC RG Genética Avançada. Agua Boa, MT
  LinkSala, Rodrigo Vasconcellos (*) NAC Universidade de São Paulo. Faculdade de Medicina Veterinária e Zootecnia. Departamento de Reprodução Animal. São Paulo, SP
  LinkBarbuio, J. P. (*) NAC MSD Animal Health. São Paulo, SP
  LinkBaruselli, Pietro Sampaio
Fonte   LinkIn: Theriogenology, Nova York, v. 81, n. 2, p. 284-290, 2014, ISSN: 0093-691X
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Resumo/Outros   Two experiments were designed to evaluate the use of resynchronization (RESYNCH) protocols using a progestin-based timed artificial insemination (TAI) protocol in beef cattle. In experiment 1, 475 cyclic Nelore heifers were resynchronized 22 days after the first TAI using two different inducers of new follicular wave emergence (estradiol benzoate [EB; n ¼ 241] or GnRH [n ¼ 234]) with the insertion of a norgestomet ear implant. At ear implant removal (7 days later), a pregnancy test was performed, and nonpregnant heifers received a dose of prostaglandin plus 0.5 mg of estradiol cypionate, with a timed insemination 48 hours later. The pregnancy rate after the first TAI was similar (P ¼ 0.97) between treatments (EB [41.9%] vs. GnRH [41.5%]). However, EB-treated heifers (49.3%) had a greater (P ¼ 0.04) pregnancy per AI (P/AI) after the resynchronization than the GnRH-treated heifers (37.2%). In experiment 2, the pregnancy loss in 664 zebu females (344 nonlactating cows and 320 cyclic heifers) between 30 and 60 days after resynchronization was evaluated. Females were randomly assigned to one of two groups (RESYNCH 22 days after the first TAI [n ¼ 317] or submitted only to natural mating [NM; n ¼ 347]). Females from the NM group were maintained with bulls from 15 to 30 days after the first TAI. The RESYNC-treated females were resynchronized 22 days after the first TAI using 1 mg of EB on the first day of the resynchronization, similar to experiment 1. No difference was found in P/AI (NM [57.1%] vs. RESYNC [61.5%]; P ¼ 0.32) or pregnancy loss (NM [2.0%] vs. RESYNC [4.1%]; P ¼ 0.21) after the first TAI. Moreover, the overall P/AI after the RESYNCH protocol was 47.5%. Thus, the administration of 1 mg of EB on day 22 after the first TAI, when the pregnancy status was undetermined, promotes a higher P/AI in the resynchronized TAI than the use of GnRH.
  Also, the administration of 1 mg of EB 22 days after the TAI did not affect the preestablished pregnancy
 
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Itens na Biblioteca   FMVZ-Fac. Med. Vet. ZootecniaLibrary Info
Unidade USP   FMVZ -- FAC DE MEDICINA VETERINÁRIA E ZOOTECNIA

Escolher formato: Padrão Ficha Formato Reduzido Nomes MARC Campos MARC


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