Dynamics of gonadotropin release following ovariectomy and injection of gonadotropin-releasing hormone in early postpartum dairy cows.

Gregory Dissen, T. A. Mollett, R. S. Youngquist, H. A. Garverick

Research output: Contribution to journalArticle

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Abstract

The influence of the ovary and of injection of low doses of gonadotropin-releasing hormone on secretion and gonadotropin-releasing hormone-induced release of gonadotropins in early postpartum cows was examined in a 2 x 2 factorial design (6 cows/group). Twelve cows were ovariectomized 2 d postpartum (calving = d 0; groups 1 and 2) and 12 cows were left intact (groups 3 and 4). Groups 1 and 3 received gonadotropin-releasing hormone (5 micrograms) every 120 min for 70 h from d 6 to d 9; groups 2 and 4 received saline by the same regimen. All animals received 50 micrograms gonadotropin-releasing hormone on d 9. Mean concentrations of FSH were higher following ovariectomy compared with those of intact cows 6 to 8 d postpartum, whereas no differences in FSH were observed between cows receiving gonadotropin-releasing hormone or saline during this period. Concentrations of LH were similar in intact and ovariectomized cows on d 6 to 8 but were increased in cows receiving gonadotropin-releasing hormone compared with cows receiving saline. Ovariectomy did not alter the gonadotropin-releasing hormone-induced release of gonadotropins on d 9. Injection of gonadotropin-releasing hormone on d 6 to 8 resulted in a decreased gonadotropin-releasing hormone-induced release of gonadotropins on d 9. It was concluded that removal of ovarian influence resulted in increased secretion of FSH but did not affect gonadotropin-releasing hormone-induced release of LH and FSH during the early postpartum period.

Original languageEnglish (US)
Pages (from-to)3489-3496
Number of pages8
JournalJournal of Dairy Science
Volume71
Issue number12
StatePublished - Dec 1988
Externally publishedYes

Fingerprint

gonadotropin release
ovariectomy
Ovariectomy
gonadotropin-releasing hormone
Gonadotropins
Gonadotropin-Releasing Hormone
Postpartum Period
dairy cows
injection
Injections
cows
secretion
postpartum period
calving
Ovary

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Food Science
  • veterinary(all)

Cite this

Dynamics of gonadotropin release following ovariectomy and injection of gonadotropin-releasing hormone in early postpartum dairy cows. / Dissen, Gregory; Mollett, T. A.; Youngquist, R. S.; Garverick, H. A.

In: Journal of Dairy Science, Vol. 71, No. 12, 12.1988, p. 3489-3496.

Research output: Contribution to journalArticle

Dissen, Gregory ; Mollett, T. A. ; Youngquist, R. S. ; Garverick, H. A. / Dynamics of gonadotropin release following ovariectomy and injection of gonadotropin-releasing hormone in early postpartum dairy cows. In: Journal of Dairy Science. 1988 ; Vol. 71, No. 12. pp. 3489-3496.
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