Ability of induced corpora lutea to maintain pregnancy in beef cows

P. J. Bridges, D. J. Wright, W. I. Buford, N. Ahmad, H. Hernandez-Fonseca, M. L. McCormick, F. N. Schrick, R. A. Dailey, P. E. Lewis, E. K. Inskeep

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23 Scopus citations

Abstract

Experiments were conducted in beef cows without a primary CL, in which pregnancy had been maintained with exogenous progestogen. In preliminary trials, replacement CL induced ipsilateral to the embryo and after, rather than before, d 36 of pregnancy, maintained more pregnancies after withdrawal of exogenous progestogen (13/13 vs 2/6; P < 0.05). In Exp. 1, in cows with replacement CL induced by treatment with hCG on d 28 of pregnancy, treatment with flunixin meglumine on d 31 through 37 did not increase maintenance of pregnancy. Experiment 2 was conducted to evaluate directly the effects of concentrations of PGF and estradiol-17β during d 31 through 35 of pregnancy on maintenance of pregnancy by replacement CL induced between d 28 and 31. In cows that maintained pregnancy while progestogen was provided, maintenance of pregnancy after withdrawal of exogenous progestogen tended to be greater with high (5/5) than with low (2/6; P < 0.10) concentrations of PGF and greater with low (6/7) than with high (2/6; P = 0.10) concentrations of estradiol-17β. Secretion of progesterone by replacement CL was greater (P < 0.05) in cows with high than in those with low concentrations of PGF during d 31 through 35. Prostaglandin F may facilitate attachment of the bovine embryo (d 30 to 40) in a manner similar to that reported for implantation in other species. Cows that did not form CL in response to hCG on d 28 to 31 responded well when retreated after d 36. Again, maintenance of pregnancy was greater when replacement CL were induced after (9/9) rather than before d 36 (8/16; P < 0.05).

Original languageEnglish
Pages (from-to)2942-2949
Number of pages8
JournalJournal of Animal Science
Volume78
Issue number11
DOIs
StatePublished - Nov 2000

Keywords

  • Cattle
  • Corpus luteum
  • Embryo mortality
  • Pregnancy
  • Prostaglandins

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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