Effect of recombinant bovine somatotropin on pregnancy rates of Nellore cows resynchronized with the use of new DIB and third use, and inseminated at fixed-time

Authors

  • Josemara Silva Santos Universidade Federal do Tocantins
  • Tania Cavalcante Universidade Federal do Piauí
  • Francisca Elda Ferreira Dias Universidade Federal do Tocantins
  • Domenica Palomaris Mariano de Souza Universidade Federal do Tocantins
  • Alencariano J.S. Falcão Universidade Federal do Tocantins
  • Mônica Arrivabene Universidade Federal do Piauí
  • Juliano Franco de Souza Laboratório Brio Genética e Biotecnologias Ltda
  • José Adalmir Torres de Sousa Universidade Federal do Piauí
  • Viviane Mayumi Maruo Universidade Federal do Tocantins

DOI:

https://doi.org/10.24297/jaa.v4i1.4304

Keywords:

Cattle, growth hormone, progesterone, reproduction, zebu.

Abstract

The objective of the experiment was to evaluate the effects of recombinant bovine somatropin (rbST), and the reuse of the progesterone (P4) releasing devices in resynchronization, on the pregnancy rates of Nellore cows submitted to fixed-time artificial insemination. A group of 123 multiparae Nellore cows, was submitted to a resynchronization protocol: on day 0 a Bovine Intravaginal Device (DIB® ) with 1,0g of P4 was implanted, associated with intramuscular administration of 2,0mg of estradiol benzoate (IM); on day 8 DIB was removed; and 1,0mg of estradiol cypionate, 0,15mg of prostaglandin F2? and 300 UI of equine chorionic gonadotropin were administered; on day 10, fixed-time artificial insemination was conducted (FTAI). The cows were randomized into G1 (n=12) – without rbST / with used Bovine Intravaginal Device, G2 (n=50) – without rbST / with new DIB, G3 (n=11) - with rbST / with used DIB and G4 (n=50) – with rbST/ with new DIB. rbST was introduced on the eighth day of the protocol. Sixty days after TAI, pregnancy diagnoses were conducted, via rectal palpation. Blood samples were taken on day 0, 8 and 10 of the protocol, in order to assess P4 plasma concentrations. Pregnancy rates were statistically evaluated through Generalized Linear Models Theory and their significance was tested with Analysis of Deviance. Pregnancy rates were 58%, 40%, 81% and 48% for G1, G2, G3 and G4, respectively, with significant statistical difference for G3. Plasma concentrations of P4 were not statistically different among groups, or collections. In view of the results obtained, we concluded that the administration of rbST in association with P4 DIB, used for the third time, improves pregnancy rates. Estrus resynchronization and re-insemination positively impacted pregnancy rates.

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Author Biographies

Josemara Silva Santos, Universidade Federal do Tocantins

Universidade Federal do Tocantins, Programa de Pós Graduação em Ciência Animal Tropical, Escola de
Medicina Veterinária e Zootecnia, campus de Araguaína, Tocantins, Brazil. BR 153, Km 112, CEP: 77.804-
970. E-mail: josemara_ss@hotmail.com

Tania Cavalcante, Universidade Federal do Piauí

Universidade Federal do Piauí, Centro de Ciências Agrárias, Departamento de Clínica e Cirurgia Veterinária,
campus Petrônio Portela, Teresina, Piauí, Brazil. E-mail: tania@ufpi.edu.br

Francisca Elda Ferreira Dias, Universidade Federal do Tocantins

Universidade Federal do Tocantins, Programa de Pós Graduação em Ciência Animal Tropical, Escola de
Medicina Veterinária e Zootecnia, campus de Araguaína, Tocantins, Brazil. BR 153, Km 112, CEP: 77.804

Domenica Palomaris Mariano de Souza, Universidade Federal do Tocantins

Universidade Federal do Tocantins, Programa de Pós Graduação em Ciência Animal Tropical, Escola de
Medicina Veterinária e Zootecnia, campus de Araguaína, Tocantins, Brazil. BR 153, Km 112, CEP: 77.804

Alencariano J.S. Falcão, Universidade Federal do Tocantins

Universidade Federal do Tocantins, Programa de Pós Graduação em Ciência Animal Tropical, Escola de
Medicina Veterinária e Zootecnia, campus de Araguaína, Tocantins, Brazil. BR 153, Km 112, CEP: 77.804

Mônica Arrivabene, Universidade Federal do Piauí

Universidade Federal do Piauí, Centro de Ciências Agrárias, Departamento de Clínica e Cirurgia Veterinária,
campus Petrônio Portela, Teresina, Piauí, Brazil. E-mail: tania@ufpi.edu.br

Juliano Franco de Souza, Laboratório Brio Genética e Biotecnologias Ltda


Laboratório Brio Genética e Biotecnologias Ltda, Araguaína, Tocantins, Brazil. E-mail:
julianofranco@yahoo.com

José Adalmir Torres de Sousa, Universidade Federal do Piauí

Universidade Federal do Piauí, Centro de Ciências Agrárias, Departamento de Clínica e Cirurgia Veterinária,
campus Petrônio Portela, Teresina, Piauí, Brazil. E-mail: tania@ufpi.edu.br

Viviane Mayumi Maruo, Universidade Federal do Tocantins

Universidade Federal do Tocantins, Programa de Pós Graduação em Ciência Animal Tropical, Escola de
Medicina Veterinária e Zootecnia, campus de Araguaína, Tocantins, Brazil. BR 153, Km 112, CEP: 77.804-
970. E-mail: josemara_ss@hotmail.com

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Published

2015-05-06

How to Cite

Santos, J. S., Cavalcante, T., Ferreira Dias, F. E., Mariano de Souza, D. P., Falcão, A. J., Arrivabene, M., Souza, J. F. de, Torres de Sousa, J. . A., & Mayumi Maruo, V. (2015). Effect of recombinant bovine somatotropin on pregnancy rates of Nellore cows resynchronized with the use of new DIB and third use, and inseminated at fixed-time. JOURNAL OF ADVANCES IN AGRICULTURE, 4(1), 356–362. https://doi.org/10.24297/jaa.v4i1.4304

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