Fetal Sexing

The first filly (a Quarter Horse) foaled using NP sex-sorted semen, Nov. 22, 2016.


Colt or Filly? Breeders Soon Might be Able to Choose

December 09, 2017

Researchers are studying whether magnetic nanoparticles could effectively separate "X" and "Y" stallion spermatozoa.... Read More


LMU Students Share Collaborative Research Project Updates

August 25, 2017

Research topics included deworming, cytokine production in senior horses, fatal suspensory apparatus injuries, and more.... Read More


Female Equine Embryo Survival Studied

December 20, 2012

Researchers evaluated how female embryo survival could be enhanced under conditions that tend to favor male births.... Read More


TheHorse.com Poll Recap: Choosing Foals' Sex

December 19, 2012

The majority of respondents said they'd rather not choose a future foal's sex ahead of time.... Read More


Study: Choosing Sex of Future Foals Could be Possible

September 29, 2012

Breeders might soon be able to use sex-sorted stallion semen to pick the sex of their future foals. ... Read More


New Equine Fetal Sex Determination Technique Studied

March 05, 2012

The team achieved up to a 95% accuracy rate by using mares' blood plasma to determine fetal gender.... Read More


Genetic Selection for Equine Health and Performance

January 01, 2012

Understanding genetic determinants for health conditions can help us identify and manage predisposed horses.... Read More


Determining Fetal Gender: Practice Makes Perfect

March 01, 2011

Transrectal ultrasounds can be up to 100% accurate in determining fetal sex at a determined gestational age. ... Read More


First Biopsied Vitrified Embryo Foal Born

February 15, 2010

The world's first foal from a biopsied and vitrified embryo transferred into a surrogate mare was born Jan. 27, 2010, at Minitube International Center for Biotechnology in Mount Horeb, Wisc. The procedure used to create the filly provides ho... Read More


Fetal Sex Determination in the Mare Between 90 and 150 Days

February 01, 2007

Accurate determination of fetal sex can have a profound impact on the broodmare management practices of horse owners and breeders. While the gender of a foal influences its value, it also influences the value of the gravid (pregnant) mare.... Read More


From Breeding to Birth

February 01, 2007

Testing innovative techniques and brushing up on common procedures are the lifeblood of advancing any medical specialty, and the field of equine reproduction is no exception. Veterinarians are always looking for new ways to improve procedures they... Read More


Filly or Colt? Find Out Before It's Born

January 01, 2001

Knowing the gender of a foal before it is born helps the horse owner or breeder better manage several different aspects of the horse business. This new management tool is very safe, accurate, and can be incorporated into most breeding programs... Read More


Equine Fetal Sex Determination

April 01, 1999

Knowledge of a fetus’ sex enables the horse owner or breeder to manage several  different aspects of his or her horse business better. For example, the value of a foal frequently is influenced by its gender, depending on its sire or dam.... Read More


First Sex-Selected Filly Born

August 21, 1998

Through the collaborative efforts of Colorado State University, USDA, MoFlo, and the U.S. Department of Agriculture and Cytomation the world's first sex-selected filly was born August 6, 1998. The filly, Call Me Madam, was... Read More


Advances In Semen Sexing

December 01, 1997

Rens, Welch, and Johnson of Beltsville, Md., reported significant improvements in their flow cytometric semen sexing procedure at the American Society of Animal Science's meeting.

The sexing of sperm with the Beltsville method is based o... Read More