That all is very interesting, is this ranch specifically breeding for silver dapple horse then? Breeding for color ((In addition
to longevity, soundness, no genetic disorders, good conformation, etc and so forth)) has become increasingly common in the last decade in the horse breeding world it seems.
Can't say that I blame any breeder looking to wrap their horses in a pretty color. The public loves
color and with the horse market being what it is, anything that adds value to potential foals would be seriously looked at by any business-person.
Especially since these are fillies.
Since geldings are the traditional working ranch horses out west --Particularly among the Buckaroo sub-culture of the Cowboy it seems-- mares aren't usually used for riding on the big ranches. Some ranches even forbid mares altogether! Mares are used as broodmares almost exclusively and only so many fillies are needed each year to replace their aging mothers, so plenty of fillies end up as surplus that needs to be sold.
Not that no mares are ever ridden on some of the west's largest cattle ranches, but the tradition seems to hold strong in some regions of the US even today.
That's what I assume is the case with these fillies anyway.