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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/14323
Title: 
Fixed-time artificial insemination with estradiol and progesterone for Bos indicus cows I: Basis for development of protocols
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Univ Florida
ISSN: 
0093-691X
Abstract: 
Five experiments were conducted on commercial farms in Brazil aiming to develop a fixed-time artificial insemination (TAI) protocol that achieved pregnancy rates between 40% and 55% in Bos indicus cows. These studies resulted in the development of the following protocol: insertion of all intravaginal device containing 1.9 g of progesterone (CIDR) plus 2.0 mg im estradiol benzoate on Day 0; 12.5 mg im dinoprost tromethamine on Day 7 in cycling cows or oil Day 9 in anestrous cows; CIDR withdrawal plus 0.5 mg im estradiol cypionate plus temporary calf removal on Day 9; TAI (48 h after CIDR withdrawal) plus reuniting of calves with their dams on Day 11. Reduced dose of prostaglandin F(2 alpha) (PGF(2 alpha): 12.5 mg im dinoprost tromethamine) effectively caused luteolysis. In cycling cows, fertility was greater when the treatment with PGF(2 alpha) was administered on Day 7 than oil Day 9, but in anestrous cows, no effects of time of the PGF(2 alpha) treatment were found. Estradiol cypionate effectively replaced estradiol benzoate or gonadotropin-releasing hormone as the ovulatory stimulus, reducing labor and cost. In this protocol, CIDR inserts were successfully used four times (9 d each use) with no detrimental effects on fertility. (C) 2009 Elsevier B.V. All rights reserved.
Issue Date: 
15-Jul-2009
Citation: 
Theriogenology. New York: Elsevier B.V., v. 72, n. 2, p. 179-189, 2009.
Time Duration: 
179-189
Publisher: 
Elsevier B.V.
Keywords: 
  • Bos indicus
  • Estradiol
  • Fixed-time artificial insemination
  • Pregnancy rated
  • Progesterone
Source: 
http://dx.doi.org/10.1016/j.theriogenology.2009.02.010
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/14323
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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