Serum levels of luteinizing hormone and progesterone during the estrous cycle, pseudopregnancy and pregnancy in the dog

M (Susan) Smith, L. E. McDonald

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Serum levels of LH and progesterone were measured by radioimmunoassay and competitive protein binding techniques respectively in nonmated, sterile mated (to a vasectomized male) and fertile mated female beagles. There were no differences in the pattern of LH secretion in the non pregnant and pregnant animals. The levels of LH were elevated for approximately 4 days, with the peak concentration (27 ± 5.2 ng/ml) occurring on the day prior to the first day of standing estrus. At all other times, LH remained between 2 and 4 ng/ml. Ovulation was observed late on the first day of standing estrus or nearly 24 hr after the LH peak. By 10 days after the LH peak, the concentration of progesterone had increased to 20-30 ng/ml in the nonpregnant and pregnant dogs. In all nonpregnant animals, the pattern of progesterone secretion after day 10 was similar; decreasing from day 10 and subsequently waning to nondetectable levels (

Original languageEnglish (US)
Pages (from-to)404-412
Number of pages9
JournalEndocrinology
Volume94
Issue number2
StatePublished - 1974
Externally publishedYes

Fingerprint

Pseudopregnancy
Estrous Cycle
Luteinizing Hormone
Progesterone
Estrus
Dogs
Pregnancy
Serum
Competitive Binding
Ovulation
Protein Binding
Radioimmunoassay

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Serum levels of luteinizing hormone and progesterone during the estrous cycle, pseudopregnancy and pregnancy in the dog. / Smith, M (Susan); McDonald, L. E.

In: Endocrinology, Vol. 94, No. 2, 1974, p. 404-412.

Research output: Contribution to journalArticle

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