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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
- Universidade Estadual Paulista (UNESP)
- Univ Florida
- 0093-691X
- 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.
- 15-Jul-2009
- Theriogenology. New York: Elsevier B.V., v. 72, n. 2, p. 179-189, 2009.
- 179-189
- Elsevier B.V.
- Bos indicus
- Estradiol
- Fixed-time artificial insemination
- Pregnancy rated
- Progesterone
- http://dx.doi.org/10.1016/j.theriogenology.2009.02.010
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/14323
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