Sexed Semen for Stallions: Thoughts?

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Sexed Semen for Stallions: Thoughts?

This is a discussion on Sexed Semen for Stallions: Thoughts? within the Horse Breeding forums, part of the Horse Breeds, Breeding, and Genetics category
  • Semen sexing horses
  • Centrifuge sexed semen

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    05-23-2013, 04:03 PM
Exclamation Sexed Semen for Stallions: Thoughts?

Hello! I'm new here and would like to inquire among the horse industry, what are your thoughts about a sexed semen product for stallions?
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    05-23-2013, 04:12 PM
How much does it cost to sex it?
    05-23-2013, 09:58 PM
I kind of like the idea.

For a breeder who really wants a filly out of a mare, to retain as a broodmare after that mare retires, I like the idea as a guarantee that the resulting foal will be at least partly what the breeder wants - a filly. Especially if said mare has a tendency to want to throw colts. Or a breeder who's trying to breed their next stallion, they can guarantee they get a colt.

Or, a small-time hobby breeder who wants one foal out of their mare, but doesn't want a particular sex of foal. My mother, for example, if the cost was not prohibitive, would get semen that would guarantee her a colt. She doesn't like mares and only ever breeds for a horse for her personally, so she would be happier if she ended up with a colt [to geld]. I personally like mares, they seem to tend to try harder than geldings, and I'm not experienced enough yet to have a stallion - stallions tend to try hardest of all under saddle and have the most incredible presence - so given the choice, ideally, I would want a filly. But I'm not that picky, I have a gelding I absolutely adore - it's just that IME geldings tend to put in the minimum required effort, whereas mares tend to want to put more energy into what they're asked to do.

My current mare, well, filly really, is a horse that combines an incredible work ethic, a lot of natural athleticism, and a real joy for living. It makes her a pleasure to work with. She's really a joy to train. From her eventual foal, when she's old enough and has proven herself under saddle [going a long way towards that already... she's lightly broke but proves her intelligence with every ride], I want the same traits. Colt [ahem.. gelding] or filly. If I'm being extremely particular, yes, I want another filly, to continue the bloodline. I would pay extra, within reason, to guarantee getting a filly [and while we're at it, I want a chestnut foal... simple way to guarantee THAT is to breed to one of the many spectacular chestnut stallions available]. This filly of mine is incredible. Best horse I've ever had. One of the best horses I've even had contact with, and that's saying something, given that I've had contact with GP dressage horses.
    05-23-2013, 10:04 PM
What would the accuracy be? And cost is going to play a huge role in wether or not it be useful to the majority.
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    05-23-2013, 10:12 PM
I would continue to take my chances as a breeder on the foals sex.
As a breeder the last thing on my wishlist is the sex of the foal.
I know what I would prefer. If I breed for a healthy sound versatile horse the sex is not important if all those things are present in the foal.
I for one will not be using that kind of technology in my breeding program. Shalom
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    05-23-2013, 10:22 PM
Green Broke
Originally Posted by blue eyed pony    
.............Especially if said mare has a tendency to want to throw colts.
Isn't it the stud that determines the gender of the foal? (and hence this technology?)

I think the mare can only contribute the female part of the equation. (Trying to think back to my biology classes ).
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    05-23-2013, 10:35 PM
Originally Posted by trailhorserider    
Isn't it the stud that determines the gender of the foal? (and hence this technology?)

I think the mare can only contribute the female part of the equation. (Trying to think back to my biology classes ).
Yes, the mother only contribute X chromosome. The male contributes either X or Y and is essentially the one to chose the gender (Henry the VIII could only blame himself!).

Would it be done by centrifuge? The idea is that sperm containing an X is heavier than Y so female would be on the bottom while male would be at the top. I don't recall it being very accurate though.
    05-23-2013, 11:47 PM
Nope, its done by a special machine. Bare with me because it was about two semesters ago that we discussed this so might not remember everything exactly right LOL

The machine works with gravity and slowly drips out each individual sperm. Then is read through a lighted system (or laser) since the chromosomes are different size and since they have a charge, are then separated using two magnets.


If I recall it's quite pricy, VERY time consuming, and can be difficult keeping the sperm alive at the correct temperatures.
    05-24-2013, 12:12 AM
Originally Posted by trailhorserider    
Isn't it the stud that determines the gender of the foal? (and hence this technology?)

I think the mare can only contribute the female part of the equation. (Trying to think back to my biology classes ).
Theoretically, yes, but the individual sperm cell that actually manages to fertilize the egg is the one that can best get through the proteins surrounding said egg [been a while since I actually used this part of my biology knowledge...]. For some reason, some mares seem to only throw colts, or only fillies.

I, as a prospective hobby breeder [just want the one foal out of my filly at this point in time, though I'm going to see how I go with that regarding whether or not I want to work my way up to actually breeding to sell], like to watch breeding barns that consistently turn out a very nice animal, and one in particular that I can think of has a mare that only ever has colts. I think she's had eight foals [older mare] and hasn't had a single filly. A couple of repeat breedings, but not all to the same stallion, and the stallions have all sired fillies with other mares.
    05-24-2013, 01:45 AM
Bah, I was going to type an actual reply but it is almost two in the morning and so I'll stick this here: The Five-Cross Files | Frail Broodmare? Expect a Filly | Blog Stable

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