How is it possible for a horse to have a three-quarters brother?

Question

I was just watching a horse racing program and a commercial came on for a breeder and it said the horse was a three quarters brother to another horse. How is this possible?

Please list sources.

Answer 1

1/2 siblings are horses who have the same dam (mother) but different sires. A 3/4 sibling would be the same dam and different sire but the two sires would be 1/2 brothers. A good way to understand this is to actually see it laid out. http://www.pedigreequery.com/go+for+gin is the pedigree for Kentucky Derby winner Go For Gin. http://www.pedigreequery.com/pleasant+ta... is the pedigree for his 3/4 brother Pleasant Tap. Notice how both horses are out of the mare Never Knock (the lower left hand pink box). Their sires are Cormorant and Pleasant Colony (both the upper left blue box). If you look at the four boxes in the second column, the first blue box in each is His Majesty. That is the sire of both Cormorant and Pleasant Colony. Below that is a pink box with the name of their dams (obviously different mares). The lower two boxes are the sire and dam of Never Knock (so obviously will be the same). Therefore 3 out of 4 of those relatives are common, hence 3/4s sibling.

Answer 2

Technically, the answer given in the first reply was correct -- but I do not believe mating is done between mothers and sons, even in the bizarre world of horse racing/breeding.

Here's how you get a "3/4 brother":

MamaHorse and PapaHorse#1 produce BabyHorseX.

MamaHorse and PapaHorse#2 produce BabyHorseY.

*Now*, you'd tell me they were half-brothers -- i.e., that BabyHorseX and Y were half brothers, right? And you'd be correct -- they have different fathers and the same mother...

But you'd be missing something!

If PapaHorse#1 and PapaHorse#2 are brothers, THEN BabyHorseX and BabyHorseY share the same mother AND their fathers are also related.

Hence, the 3/4 figure.

And, this doesn't lead to horses that are inbred (to a greater degree) -- at least not when practiced once in a population.

Answer 3

the horse has to have either the same sire and directly related on the mothers side by the mother having the same sire as the other brothers...but perhaps a different mother, that would make the horse directly related on top (sire) and one half on the bottom ...

Answer 4

in breed

mom + dad = you

mom +other dad = x

x + mom = 3/4

i think but what the h**l do i know