[Heavenly Jumper]

Originally Posted by gigga

ok I see this word so often "homozygous" can any one tell me what it means?

It means that the horse has two copies of any given gene. That being he/she MUST pass at least one copy of it to the offspring.

Like a homozygous black horse will always pass one copy of the black gene since he/she has two copies. Black is dominant, so if one copy gets passed it will show on the foal as black.

Heterozygous means one of each. Like in a black horse that is heterozygous...he/she will have one copy of black an one copy of red. Black is dominant so the horse appears black, but can pass a red OR black gene.

[gigga]

Originally Posted by HeavenlyJumper

It means that the horse has two copies of any given gene. That being he/she MUST pass at least one copy of it to the offspring.

Like a homozygous black horse will always pass one copy of the black gene since he/she has two copies. Black is dominant, so if one copy gets passed it will show on the foal as black.

Heterozygous means one of each. Like in a black horse that is heterozygous...he/she will have one copy of black an one copy of red. Black is dominant so the horse appears black, but can pass a red OR black gene.

so a homozygous black horse will always have a black based fole, never að solid red?

[RiddleMeThis]

Originally Posted by gigga

so a homozygous black horse will always have a black based fole, never að solid red?

Yep thats what it means.

Also a horse who is homozygous for cream will always have cream foals.

A horse who is homozygous for dun will always have a dun foal.

A horse that is homozygous for Agouti will always give the foal agouti.

[gigga]

ok.. thank you two

[accphotography]

A homozygous black horse could also be a bay... just to throw that out.

ACC

[Heavenly Jumper]

Originally Posted by accphotography

A homozygous black horse could also be a bay... just to throw that out.

ACC

It all depends on the pesky modifiers!

[sambersmate]

yup definitely as our homozygous black lad is in fact dark bay

I guess if we wanted to guarantee true blacks we would need to breed two homozygous black agouti negative horses? exempt of other modifying factors

I guess this is why Friesans are nearly always black? with very few exceptions?

[Spotted Mustang]

Originally Posted by sambersmate

yup definitely as our homozygous black lad is in fact dark bay

I guess if we wanted to guarantee true blacks we would need to breed two homozygous black agouti negative horses? exempt of other modifying factors

I guess this is why Friesans are nearly always black? with very few exceptions?

Yes. I believe that any stallion testing Ee instead of EE is not approved for breeding, no matter how exceptional he is otherwise because the proper color is so important to them.

And yes, if you always wanted to have true black foals, you would have to breed two EEaa horses together that did not have gray, cream, or any other outside modifier.

[Sheza_Angel]

I would love to see how he looks as he matures too - wow! What a handsome boy and a lovely color too!

[RiddleMeThis]

Originally Posted by Spotted Mustang

Yes. I believe that any stallion testing Ee instead of EE is not approved for breeding, no matter how exceptional he is otherwise because the proper color is so important to them.

Stallions that are Ee I believe are approved, but once they have a chestnut foal (if ever) they tend to get ignored.

As far as I know. I could be wrong, but thats what I have heard.