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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/69517
Title: 
The effect of type of vaginal insert and dose of pLH on embryo production, following fixed-time AI in a progestin-based superstimulatory protocol in Nelore cattle
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Fazenda Nova América
ISSN: 
0093-691X
Abstract: 
The objective was to analyze and report field data focusing on the effect of type of progesterone-releasing vaginal insert and dose of pLH on embryo production, following a superstimulatory protocol involving fixed-time artificial insemination (FTAI) in Nelore cattle (Bos taurus indicus). Donor heifers and cows (n = 68; 136 superstimulations over 2 years) received an intravaginal, progesterone-releasing insert (CIDR® or DIB®, with 1.9 or 1.0 g progesterone, respectively) and 3-4 mg of estradiol benzoate (EB) i.m. at random stages of the estrous cycle. Five days later (designated Day 0), cattle were superstimulated with a total of 120-200 mg of pFSH (Folltropin-V®), given twice daily in decreasing doses from Days 0 to 3. All cattle received two luteolytic doses of PGF2α at 08:00 and 20:00 h on Day 2 and progesterone inserts were removed at 20:00 h on Day 3 (36 h after the first PGF2α injection). Ovulation was induced with pLH (Lutropin-V®, 12.5 or 25 mg, i.m.) at 08:00 h on Day 4 with FTAI 12, 24 and in several cases, 36 h later. Embryos were recovered on Days 11 or 12, graded and transferred to synchronous recipients. Overall, the mean (±S.E.M.) number of total ova/embryos (13.3 ± 0.8) and viable embryos (9.4 ± 0.6) and pregnancy rate (43.5%; 528/1213) did not differ among groups, but embryo viability rate (overall, 70.8%) was higher in donors with a DIB (72.3%) than a CIDR (68.3%, P = 0.007). In conclusion, the administration of pLH 12 h after progesterone removal in a progestin-based superstimulatory protocol facilitated fixed-time AI in Nelore donors, with embryo production, embryo viability and pregnancy rates after embryo transfer, comparable to published results where estrus detection and AI was done. Results suggested a possible alternative, which would eliminate the need for estrus detection in donors. © 2006 Elsevier Inc. All rights reserved.
Issue Date: 
1-Feb-2007
Citation: 
Theriogenology, v. 67, n. 3, p. 655-660, 2007.
Time Duration: 
655-660
Keywords: 
  • Bovine
  • Embryo transfer
  • pLH
  • Progesterone
  • Superovulation
  • gestagen
  • hormone
  • luteinizing hormone
  • animal
  • animal disease
  • artificial insemination
  • cattle
  • clinical trial
  • drug effect
  • embryo (anatomy)
  • female
  • intravaginal drug administration
  • methodology
  • ovulation induction
  • physiology
  • pregnancy
  • pregnancy rate
  • reproduction
  • Administration, Intravaginal
  • Animals
  • Cattle
  • Embryo, Mammalian
  • Female
  • Hormones
  • Insemination, Artificial
  • Luteinizing Hormone
  • Ovulation Induction
  • Pregnancy
  • Pregnancy Rate
  • Progestins
  • Reproduction
  • Bos indicus
  • Bos taurus
Source: 
http://dx.doi.org/10.1016/j.theriogenology.2006.10.001
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/69517
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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