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Biology of Reproduction, Vol 36, 523-529, Copyright © 1987 by Society for the Study of Reproduction

ARTICLES

Destruction of bovine ovarian follicles: effects on the pulsatile release of luteinizing hormone and prostaglandin F2 alpha-induced luteal regression

TL Hughes, A Villa-Godoy, JS Kesner and RL Fogwell

Destruction of ovarian follicles during diestrus prolongs the lifespan of corpora lutea in cows, but the site(s) of action is unclear. Thus, ovarian follicles were destroyed in 10 beifers (X-IRRAD) on Day 9 postestrus, while 10 additional beifers (SHAM) served as a control group. To investigate changes in luteotropic support resulting from destruction of ovarian follicles, pulses of luteinizing hormone (LH) were characterized on Days 8, 13, and 15 postestrus. To study the interaction between products from ovarian follicles and prostaglandin F2 alpha (PGF2 alpha) in luteolysis, changes in serum concentrations of progesterone were monitored after an injection of saline or PGF2 alpha on Day 14 postestrus. Frequency and amplitude of pulses of LH increased by Day 13 in X-IRRAD beifers. An increase of similar magnitude in amplitude but not frequency of pulses of LH occurred between Day 13 and Day 15 postestrus in SHAM beifers. Exogenous PGF2 alpha was significantly less efficacious in causing luteolysis in X-IRRAD animals. We suggest that increased luteotropic support may be involved in but is not the only cause for lengthening the lifespan of corpora lutea following destruction of ovarian follicles. Additionally, we suggest that regression of bovine corpora lutea involves a synergistic action between products from ovarian follicles and PGF2 alpha.


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R. A. Sterry, M. L. Welle, and P. M. Fricke
Treatment with gonadotropin-releasing hormone after first timed artificial insemination improves fertility in noncycling lactating dairy cows.
J Dairy Sci, November 1, 2006; 89(11): 4237 - 4245.
[Abstract] [Full Text] [PDF]


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Copyright © 1987 by the Society for the Study of Reproduction.