Beautiful birds Thespoiledchicken and cjwaldon. The white ones have a really distinctive look.
I agree it is kind of strange about leathal white. Those dogs who guard goats and sheep, live with goats/sheep, and can't be bonded to humans come to mind. they are always white. Here is just one example:
http://en.wikipedia.org/wiki/Maremma_Sheepdog
Actually, I have had those dogs, Maremmas, Great Pys, Anatolians etc...the Livestock Guards ortian Dogs (LGD) and they do bond with people. However you make sure they bond to the sheep as whatever they bond to, they will protect. I have two of them and they will protect me. They are not part of the lethal white issues. They do not have the blue eyes, deafness, etc...it's a different white than a white coat.
Here are a couple of good links
http://www.findpuppiesnow.com/index.php?page=about_aussies&sub=white_aussies
http://www.bordercollie.org/health/kpwhite.html
http://www.bordercollie.org/health/kpmerle.html
Merle
The merle gene is a color modifier that acts on the basic coat color and produces a mottled pattern and can also produce blue eyes. This gene is in addition to the 2 color genes that each dog carries. A dog with a merle gene will be a merle. A sable with a merle gene is referred to as a
sable merle. Merling in a sable coat is more subtle than it is in a black coat. In a black coat, the merle gene produces a pattern of varying shades of gray with black patches. Although the term "blue merle" actually denotes this gray blue pattern, breeders most often refer to a tricolor dog with the merle gene (blue merle, white and tan) as a
blue merle, and a bi-black dog with the merle gene (blue merle and white) as a
bi-blue. If 2 merles are bred together, the offspring can have 2 merle genes, one from each parent. These are referred to as "
double merles," and most often are blind and/or deaf to some degree. For this reason, merle to merle breedings are not done by most breeders.
White factor
The
white factor gene is a color modifier that affects the amount of white on a dog. Unlike the merle gene, a dog with only one white factor gene may not be easy to distinguish. White factored dogs often will have a larger white tip on the tail and/or white along the stifle (the front edge of the hind leg). However, there are dogs with these markings that are not white factored, as well as white factored dogs that have very little white. Where the white factor gene becomes readily apparent is when a dog receives 2 white factor genes, from breeding 2 white factored dogs together. A dog with 2 white factor genes is called a "
color-headed white" (CHW) and has a normally colored head and a predominantly white body. In contrast to the double merle, (which also looks white, but does not have a normally colored head), color-headed whites are perfectly normal in every way. The only difference between them and the other colors is the amount of white on their bodies.
Diane Pagel
Carnation, WA