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.