Ok breezy you did not understand what was told to you the first time we talked to you about lethal white. I told you as well as others that its very likely your blue eyed mare carries frame/splash or both( These are the blue eyed causing genes). And that down the road IF you ever breed her you need to:
1. Have her tested for frame
2. Make sure if she is positive for frame (very likely I think in your horses case) which would make her heterozygous or carries one copy of the frame gene. That means to be a responsible breeder you must breed to a non frame carrying stud because if the colt inherits two copies of the frame gene AKA homozygous for frame you get the 100% death with a lethal white foal.
Not sure how much genetics you've learned in school yet, but I'll try to teach you the best I can over the forum lol. When or if you learn genetics you'll probably start off with mendel pea plants and a basic punnet square. A Punnet Square can give us the mathmatical possiblities of possible genes inherited from parents and these get complicated later but were going to go with one in its most basic form. There is more that we could probably go into even in the basic form but lets ignore that cause that will start a whole tangent of dominance and incomplete dominace and so on and I don't want to make it confusing. I'll probably confuse you anyways so sorry in advance lol. Feel free guys to correct anything I mess up, miss, or don't explain well. And it appears I can't make you a punnet square on my phone best to my knowledge so maybe someone with a computer can or you may try google to see what one looks like but basically and I'm just going to use the allele abbreviations of N=non frame and F= frame which using the square you would get these results. NOTE: This is a simple punnet square explaining two breedings of KNOWN frame carriers not necessarily Overo/Overo because not all overo's have frame and frame is NOT only present in paints. Each parent carries the alleles of NF or heterozygous for frame and like I said I'm trying to bypass the whole dominance thing to make it simple.
NN= Homozygous NO frame 25%
NF/NF= Heterozygous for frame 50%
FF= Homozygous FOR for frame 25%
So like I said you have a good chance of making a lethal white foal from your mare if she is frame and you breed to frame. And you might think oh I only have a 25% chance of death there's a 75% chance my foal will be normal. Not saying that you would just chance it but unfortunately there are breeders out there that do this, but I say taking any chance which would knowingly cause death is wrong and irresponsible. And not only costly to the owner but physically and emotionally costly to the mare as well.
Now here's a real life case for some of you who may not have seen it. This is my friends QH mare who doesn't necessarily scream frame. To most including her owner no one really thought much about her having frame she had two brown eyes and is solid colored exempt for a blaze which slightly goes over one of her eyes and a small white spot on her side. Well she bred her mare to a frame carrying stud. I mentioned to her that I wondered if her mare had frame due to her irregular blaze and side spot. But she said she didn't know and she like many others considered it a "paint" problem. Well I talked to her more about it but she didn't seem to worry so I just dropped it. Well her mare had her baby a few weeks back and she text me and told me that the baby was stuck for a bit and then it died right after birth as she was upset. And then she said it was a pretty colt and it was ALL WHITE. And I had her text me a pic and I said I was scared this would happen becuase low and behold a lethal white foal was born as I feared. And then I had to reexplain why the foal died which I did not enjoy. More education in the horse breeding world needs to be available. There is a lot of misconceptions about frame out there. Ok so I hope I helped and explained this well and didn't mess anything up. I'll step of my soapbox
This is my friends QH mare
This is a link to another sad true story about frame and great and sad read that I recommend. Mountain Music: On the wings of an Angel Posted via Mobile Device