REDUCTION OF THE VOLUNTARY WAITING PERIOD BY USE OF HORMONAL PROTOCOLS AND FIXED-TIME ARTIFICIAL INSEMINATION (FTAI) IN DAIRY COWS

Authors

  • Miriane Suplicy Médica Veterinária Autonoma
  • Haroldo Suplicy Filho Médico Veterinário Autonomo
  • Luiz Ernandes Kozicki Pontificia Universidade Católica do Paraná
  • José Carlos dos Santos Breda Mestrado Ciencia Animal - PUCPR
  • Romildo Romualdo Weiss UFPR
  • Marcio Saporski Segui Pontificia Universidade Catolica do Paraná

DOI:

https://doi.org/10.5380/avs.v17i3.21676

Keywords:

Key words, Voluntary waiting period, reduction, dairy cows, hormonal protocols, fixed-time artificial insemination.

Abstract

ABSTRACT: The aim of this study was to reduce the waiting voluntary period in dairy cows by administration of two different hormonal protocols for estrus synchronization and fixed-time artificial insemination (FTAI). One hundred twenty-eight Holstein dairy cows were studied. Three groups (G) were carried out: G1 (44 treated), G2 (34 treated) and G3 (50 as control). In the treated cows the following hormonal protocols was applied between 40 and 45 days post partum: G1- Day 0 (D0) - bovine intravaginal device containing progesterone (P4) plus 1.0 mg of estradiol benzoate (EB), D8 - removal of the P4, plus 0.5 mg of cloprostenol plus 400 IU of equine chorionic gonadotropin (eCG), D9 - 1.0 mg of EB and FTAI after 36 hours. G2 - D0 - P4 intravaginal plus 50 mcg of gonadotropin-releasing hormone (GnRH), D7 - removal of the P4 plus cloprostenol plus 400 IU eCG; D9 - 50 mcg of GnRH and FTAI 16 hours after. G3 – Control group inseminated 12 hours after the visual estrus. Results: G1 and G2 were inseminated (FTAI) respectively in the D55.5 and D56.8 after calving, while the G3 in the D84.5 (p<0.01).  The pregnancy rate in the G1, G2 and G3 was respectively 47.0, 46.1 and 35.8% (p>0.05).  In Conclusion: there was significant reduction in the voluntary waiting period in treated cows and higher pregnancy rate although not significant.


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Published

2012-08-09

How to Cite

Suplicy, M., Suplicy Filho, H., Kozicki, L. E., Breda, J. C. dos S., Weiss, R. R., & Segui, M. S. (2012). REDUCTION OF THE VOLUNTARY WAITING PERIOD BY USE OF HORMONAL PROTOCOLS AND FIXED-TIME ARTIFICIAL INSEMINATION (FTAI) IN DAIRY COWS. Archives of Veterinary Science, 17(3). https://doi.org/10.5380/avs.v17i3.21676

Issue

Vol. 17 No. 3 (2012)

Section

Preventive Veterinary Medicine

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