Pregnancy rate to FTAI in Braford heifers submitted to J-Synch protocol

Autores

  • Pablo Sebastián Reineri National Institute of Agricultural Technology (INTA), EEA Santiago del Estero, Santiago del Estero, La Abrita, Santiago del Estero, G4206XBK, Argentina. Faculty of Agronomy and Agribusiness (FAyA), National University of Santiago del Estero (UNSE), Santiago del Estero, G4206XCP, Argentina Animal Production and Reproduction Laboratory, NOA Institute of Bionanotechnology (INBIONATEC), Villa El Zanjón, Santiago del Estero, G4206XCP, Argentina http://orcid.org/0000-0002-4325-3134
  • Maria Sumampa Coria Faculty of Agronomy and Agribusiness (FAyA), National University of Santiago del Estero (UNSE), Santiago del Estero, G4206XCP, Argentina Animal Production and Reproduction Laboratory, NOA Institute of Bionanotechnology (INBIONATEC), Villa El Zanjón, Santiago del Estero, G4206XCP, Argentina National Council of Scientific and Technical Research (CONICET), Buenos Aires, C1033AAJ, Argentina (CONICET) http://orcid.org/0000-0002-3472-8775
  • Santiago Principi Private activity, Santiago del Estero, Argentina.
  • Rodrigo Punta Perez Agricultural Technical University Sevilla, University Sevilla (US), España.
  • Gustavo Adolfo Palma Faculty of Agronomy and Agribusiness (FAyA), National University of Santiago del Estero (UNSE), Santiago del Estero, G4206XCP, Argentina Animal Production and Reproduction Laboratory, NOA Institute of Bionanotechnology (INBIONATEC), Villa El Zanjón, Santiago del Estero, G4206XCP, Argentina National Council of Scientific and Technical Research (CONICET), Buenos Aires, C1033AAJ, Argentina (CONICET) http://orcid.org/0000-0002-9175-1322

DOI:

https://doi.org/10.26605/medvet-v14n4-3589

Palavras-chave:

estrus, synchronization protocols, GnRH, tail-paint.

Resumo

The objective of the present work was to evaluate the effect of J-Synch protocol on pregnancy rate (PR) of heifers artificially inseminated after detected estrus (DEAI) or at fixed-time (FTAI). Two hundred ninety-three Braford heifers were used. On day 0, all animals received 2.0 mg of estradiol benzoate administered intramuscularly (IM) and an intravaginal progesterone-releasing device (DIB, 0.5 g). Heifers were assigned to the following group: 1) J-Synch: on day 6, DIB devices were removed and 500 µg of d-Cloprostenol sodium (d-CS) was administered IM and paint was applied on tail base (tail-paint). On day 9 (60 h after DIB removal), heifers with ? 40% of the tail-paint rubbed off were inseminated. Those not showing estrus by 72 h after DIB removal received 100 µg of GnRH at that time and were FTAI. 2) Conventional: on day 7, DIB devices were removed, and 500 µg of d-CS and 0.5 mg of estradiol cypionate were administered IM and tail-paint. Forty-eight hours after DIB removal, heifers with the tail-paint rubbed off were DEAI. Those not showing estrus by 54 h after DIB removal were FTAI. Pregnancy rate was diagnosed by ultrasonography 30 days after FTAI in all heifers and did not differ between protocols (44.28% and 42.48%, P = 0.673). In both protocols, higher PR was observed in DEAI heifers (P = 0.047). In conclusion, the use of the J-Synch protocol generated similar PR to the Conventional protocol, allowing its use with the same efficiency. Furthermore, the DEAI generated better PR than the FTAI, regardless of the protocol used.

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Publicado

2020-11-26

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Reprodução Animal