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Theriogenology1991; 36(5); 823-830; doi: 10.1016/0093-691x(91)90348-h

Time of embryo transport through the mare oviduct.

Abstract: The objectives of this study were 1) to determine the time of embryo transport through the mare oviduct, 2) to determine whether equine embryos increase in diameter prior to the time of oviductal transport, and 3) to assess the stage of equine embryonic development at the time of oviductal transport. The time of oviductal transport (interval from ovulation to uterine entry) was estimated by collecting embryos from the mare oviduct or uterus at 2-hour intervals from 120 to 168 h postovulation. The time of oviductal transport was 130 to 142 h, since 9 9 embryos were located in the oviduct from 120 to 128 h; 7 14 embryos were in the oviduct and 7 14 embryos were in the uterus from 130 to 142 h; and 13 14 embryos were in the uterus from 144 to 168 h postovulation. Embryos collected during the period of oviductal transport (130 h to 142 h) were not significantly larger (P>0.1) in diameter than embryos collected prior to the period of oviductal transport (162.5+/-3.7 vs 156.7+/-3.1 mum, respectively). During the period of oviductal transport, embryos collected from the uterus were not significantly larger (P>0.1) in diameter than embryos collected from the oviduct (160.7+/-3.2 vs 164.3+/-7.0 mum, respectively). During this same period 12 14 embryos were compact morulae, and 2 14 embryos were blastocysts.
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Publication Date: 1991-11-01 PubMed ID: 16727051DOI: 10.1016/0093-691x(91)90348-hGoogle Scholar: Lookup
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Summary

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This research investigates the time it takes for an embryo to pass through the horse’s oviduct. It also looks into embryo size changes prior to its transport and the embryos’ developmental stages at the time. The findings indicate that the transport time is between 130 to 142 hours post ovulation and the embryo doesn’t significantly increase in size before transport. Moreover, most of the embryos at the time of transport were at the compact morulae stage, while a few were blastocysts.

Overview of the Research

  • The study aimed to explore the timing of embryo transport through the oviduct of a horse, changes in the size of the embryo before transport, and the stage of embryonic development at the time of transport.
  • Finding these details might be crucial since they can intensely influence the procedures of equine reproduction management, embryo transfer techniques, and overall understanding of equine embryonic development.

The Time of Embryo Transport

  • Experiments were designed to retrieve embryos from the horse’s oviduct or uterus at various time intervals after ovulation, ranging from 120 to 168 hours.
  • The researchers found that the majority of the embryos were positioned in the oviduct from 120 to 128 hours, some in both the oviduct and the uterus between 130 to 142 hours, and mostly in the uterus from 144 to 168 hours post ovulation.
  • Based on these observations, the study concludes that the time of embryo transport through the oviduct generally occurs between 130 to 142 hours after ovulation.

Size of Embryos

  • The size of these embryos was measured before and during the period of oviductal transport.
  • The findings indicated no significant difference in the diameter of embryos during the transport period compared to prior to the period of transport. This suggests that the embryos do not increase notably in size before they begin their journey through the oviduct.
  • Similarly, no substantial size differences were noticed comparing embryos collected from the uterus and the oviduct during the transport period.

Developmental Stage of Embryos

  • The study also concentrated on analyzing the stage of embryonic development during the transport period.
  • Most were compact morulae, a stage of the embryo that usually precedes the formation of a blastocyst, and only a few were at the blastocyst stage, indicating that the majority of the embryos remain in the early developmental stages during their journey through the oviduct.

Cite This Article

APA
Freeman DA, Weber JA, Geary RT, Woods GL. (1991). Time of embryo transport through the mare oviduct. Theriogenology, 36(5), 823-830. https://doi.org/10.1016/0093-691x(91)90348-h

Publication

Theriogenology
ISSN: 0093-691X
NlmUniqueID: 0421510
Country: United States
Language: English
Volume: 36
Issue: 5
Pages: 823-830

Researcher Affiliations

Freeman, D A
  • Northwest Equine Reproduction Laboratory Department of Animal and Veterinary Science University of Idaho Moscow, ID 83843 USA.
Weber, J A
    Geary, R T
      Woods, G L

        Citations

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