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Related Experiment Videos

Gender preselection in mammals: an overview

L A Johnson1

  • 1Germplasm and Gamete Physiology Laboratory, Agricultural Research Service U. S. Department of Agriculture, Beltsville, Maryland, USA.

DTW. Deutsche Tierarztliche Wochenschrift
|August 1, 1996
PubMed
Summary
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Sperm sexing technology allows preselection of X and Y chromosome sperm in mammals. This method, using flow cytometry, achieves high accuracy in offspring sex determination for cattle, pigs, and rabbits.

Area of Science:

  • Reproductive Biology
  • Animal Science
  • Biotechnology

Background:

  • Advances in sperm separation enable preselection of X and Y chromosome-bearing spermatozoa in mammals.
  • The Beltsville Sperm Sexing Technology utilizes inherent DNA content differences between X (larger) and Y (smaller) sperm.

Purpose of the Study:

  • To detail the methodology and assess the efficacy of sperm sexing technology for preselecting offspring sex in various mammalian species.
  • To evaluate the accuracy and viability of progeny produced using sex-sorted sperm.

Main Methods:

  • Spermatozoa are stained with Hoechst 33342, a DNA-binding fluorochrome.
  • Flow cytometry and cell sorting instrumentation measure individual sperm DNA content using laser-induced fluorescence.
  • Sorted sperm are used for in vitro fertilization (IVF) or surgical insemination.

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Main Results:

  • High accuracy rates achieved: >90% in cattle (IVF) and rabbits, 85% in pigs.
  • All (>300) progeny exhibited normal morphology and reproductive function.
  • Sorting rate of 0.5 million sperm/hour limits application in conventional artificial insemination but is suitable for IVF and surgical methods.

Conclusions:

  • Sperm sexing technology is effective for preselecting offspring sex in mammals with high accuracy and normal progeny development.
  • The technology is most applicable to assisted reproductive techniques like IVF and surgical insemination.
  • Future applications may expand with advancements like ultrasound-guided insemination, potentially reducing the required number of sorted sperm.