Embryonic migration relative to maternal recognition of pregnancy in sheep.

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

Research output: Contribution to journalArticle

18 Scopus citations

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
DOIs
StatePublished - Apr 1989
Externally publishedYes

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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