Sex Selection in Equines

This blog is intended to be an extension of a post we put up on Facebook recently that concerns the relatively new technology of sex selection in horse breeding. While I certainly do not claim to be any kind of expert in breeding, or in science for that matter, I thought that I could expand on a few interesting points that were brought up by some of our loyal Equine Chronicle followers. 

            With the introduction of any new scientific procedure, especially one concerning genetics, there will always be questions raised about its supposed benefits and possible detriments.

            Some experts claim that utilizing sex selection when breeding horses may help to eliminate gender specific diseases, or conditions that are more prevalent in either mares or stallions. Could this help to “breed out” conditions like endometriosis in mares or cryptorchidism in stallions? Or is this simply a justification for breeding to get the more profitable gender?

Is this the same thing as saying we should decrease the number of human females to lower the incidence of breast cancer, or decrease the number of males to lower the incidence of red-green color blindness? Or can these comparisons not be made between the human species and an animal species?

Over a long period of time, could this lead to an overpopulation of one sex? Could this reduce genetic diversity leading to a less disease-resistant generation of horses? Or will the high cost of the procedure and extensive regulation control for all of these concerns?

As far as ethical concerns go, some people have expressed that this technology circumvents natural selection and in essence “goes against” the will of God/Nature. With all religious implications set aside, should we as a community, have the power to select which gender we want when breeding animals? If this is something that is going to permitted in equine breeding, should it be allowed in human reproduction as well?

Other aspects to consider are the implications this may have on different breeds within the horse world. In the Thoroughbred racing scene, stallions are generally eligible to compete for higher purses, have more lucrative breeding opportunities and chances for syndication. On the other hand, in the cutting and pleasure horse arena, there seems to be a large number of standing studs, therefore owning a quality mare might be more advantageous. Could breeds become gender-specific, or is that something that would never actually happen?

While I may have raised more questions than I have answered, one thing remains clear. There are a lot of variables to consider before you decide for yourself whether or not sex selection will be beneficial or detrimental to the horse industry.