Embryonic migration relative to maternal recognition of pregnancy in sheep.

Kenneth Nephew, K. E. McClure, W. F. Pope

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Twenty-five crossbred ewes were utilized to examine the timing of embryonic migration relative to maternal recognition of pregnancy. These ewes also were utilized to examine whether ovine embryos synthesized estradiol-17 beta in association with embryonic elongation and intrauterine migration. Embryos were flushed on d 11 through 15 from hemiovariectomized ewes. Recovery of embryos from the uterine horn contralateral to the remaining ovary indicated that migration had occurred. Ewes subsequently were returned with rams to determine their interestrous interval. Recovered embryos were classified morphologically, their length determined and individually incubated. Changes in estradiol within the medium were determined after a 6-h incubation. Embryo migration began on d 14 (P less than .05); on consecutive days from 11 through 15, 0, 0, 0, 60 and 100% of ewes examined, respectively, had an embryo in the contralateral horn. Extended estrous cycles (greater than 20 d) were observed in 0, 0, 40, 80 and 100% of ewes examined (P less than .05) following removal of embryos on d 11 through 15 of the cycle. Ovine embryos were longer (P less than .05) on d 14 (4.8 +/- 1.1 cm length, mean +/- SE) compared with d 13 (.2 +/- .1 cm) and increased further (P less than .05) on d 15 (7.8 +/- 1.1 cm). Incidence of intrauterine migration was correlated with embryonic length (r = .83; P less than .01) and estradiol synthesis (r = .77; P less than .01).(ABSTRACT TRUNCATED AT 250 WORDS)

Original languageEnglish (US)
Pages (from-to)999-1005
Number of pages7
JournalJournal of Animal Science
Volume67
Issue number4
StatePublished - Apr 1989
Externally publishedYes

Fingerprint

Sheep
embryo (animal)
Embryonic Structures
Mothers
pregnancy
sheep
ewes
Pregnancy
estradiol
Estradiol
Estrous Cycle
rams
estrous cycle
Ovary
crossbreds
incidence
synthesis
Incidence

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Embryonic migration relative to maternal recognition of pregnancy in sheep. / Nephew, Kenneth; McClure, K. E.; Pope, W. F.

In: Journal of Animal Science, Vol. 67, No. 4, 04.1989, p. 999-1005.

Research output: Contribution to journalArticle

Nephew, Kenneth ; McClure, K. E. ; Pope, W. F. / Embryonic migration relative to maternal recognition of pregnancy in sheep. In: Journal of Animal Science. 1989 ; Vol. 67, No. 4. pp. 999-1005.
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