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In Vitro Fertilization01:24

In Vitro Fertilization

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In vitro fertilization (IVF) is a form of assisted reproductive technology where an egg is fertilized with sperm in a controlled laboratory environment before transferring the resulting embryo into the uterus. This process is designed to help individuals and couples experiencing difficulties conceiving.
The IVF process begins with ovarian stimulation, during which reproductive endocrinologists prescribe hormonal medications to stimulate the ovaries to produce multiple eggs instead of the single...
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Related Experiment Video

Updated: Mar 14, 2026

A High-Throughput Method For Zebrafish Sperm Cryopreservation and In Vitro Fertilization
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Optimizing Rat In Vitro Fertilization for Rat Model Cryo-Resuscitation from Frozen-Thawed Sperm.

Hongsheng Men1,2, Payton S Oswalt1,2, Elizabeth C Bryda1,2

  • 1Rat Resource and Research Center, Columbia, MO 65201, USA.

Biology
|March 13, 2026
PubMed
Summary
This summary is machine-generated.

In vitro fertilization (IVF) offers a promising alternative to intracytoplasmic sperm injection (ICSI) for cryo-resuscitating frozen rat sperm. While successful, IVF efficiency varies by rat strain, requiring further research for consistent cryo-resuscitation protocols.

Keywords:
development potentialoocyte maturationsperm freezingsuperovulationworkday schedule

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Area of Science:

  • Reproductive Biology
  • Cryobiology
  • Animal Models

Background:

  • Cryopreservation of rat sperm is crucial for maintaining genetic diversity in research models.
  • Current cryo-resuscitation often relies on intracytoplasmic sperm injection (ICSI), which can be resource-intensive.
  • Developing in vitro fertilization (IVF) protocols for frozen-thawed rat sperm could improve accessibility and efficiency.

Purpose of the Study:

  • To investigate the feasibility of replacing ICSI with IVF for cryo-resuscitation of frozen-thawed rat sperm.
  • To adapt rat IVF protocols for completion within a standard 9-hour workday.
  • To explore genetic background-specific modifications of superovulation protocols to enhance IVF outcomes.

Main Methods:

  • Rat IVF procedures were modified for a 9-hour workday, using frozen-thawed sperm from Sprague Dawley (SD), Long Evans (LE), and Fischer 344 (F344) rats.
  • Superovulation protocols were assessed for strain-specific efficacy.
  • Embryo development (cleavage, blastocyst formation, hatching) was evaluated in vitro to determine developmental potential.

Main Results:

  • IVF protocols yielded acceptable cleavage rates (58–87%) and blastocyst formation rates (21–54%) for cryo-resuscitation.
  • Modified protocols were adaptable to a 9-hour workday for SD and F344 strains.
  • Long Evans rats exhibited a 2-hour delay in oocyte maturation, and protocol modifications did not significantly improve their IVF outcomes.

Conclusions:

  • Rat IVF with frozen-thawed sperm is a viable alternative to ICSI for model cryo-resuscitation.
  • Significant variability in IVF efficiency exists across rat strains and protocols.
  • Further research is needed to optimize efficiency and repeatability of rat sperm freezing and IVF for diverse genetic backgrounds.