Longhair-to-Longhair breedings?

[tasha]

I thought the announcement made by both the company and by the canadian club was to the effect that the stockhaar coat had been identified using their DNA test??

[Steve Graham]

tasha said:

I thought the announcement made by both the company and by the canadian club was to the effect that the stockhaar coat had been identified using their DNA test??

Unfortunately, no - although the way the item on the CKC website www.weimaranercanada.org/lh/stockhaar.htm was written, it's easy to get that impression. (And I verified the lack of a specific test with the author). Neither does the testing laboratory mention anything other than the longhair trait. See www.vetdnacenter.com/canine-long-hair-test.html
The significant item is that the dam was certified to NOT be an LH carrier and thus the stockhaarig puppies were NOT of the LH genotype. This is not the same as finding the genetic signature of the stockhaar since many, probably most, longhair carriers are NOT stockhaars.
If you read that item carefully, you will see that a number of unsupported assumptions are made based upon a single litter, which brings up my favourite parable where such things are concerned:

There are three men on a train. One of them is an economist and one of them is a logician and one of them is a mathematician. And they have just crossed the border into Scotland and they see a brown cow standing in a field from the window of the train.
And the economist says, "Look, the cows in Scotland are brown."
And the logician says, "No. there are cows in Scotland of which one at least is brown."
And the mathematician says, "No. there is at least one cow in Scotland, of which one side appears to be brown."

[tasha]

this is why I wanted to find other litters of a similar trait. I do feel one litter is not enough for a significant test.

[daniela]

sdgraham said:

tasha said:

I thought the announcement made by both the company and by the canadian club was to the effect that the stockhaar coat had been identified using their DNA test??

Unfortunately, no - although the way the item on the CKC website www.weimaranercanada.org/lh/stockhaar.htm was written, it's easy to get that impression. (And I verified the lack of a specific test with the author). Neither does the testing laboratory mention anything other than the longhair trait. See www.vetdnacenter.com/canine-long-hair-test.html
The significant item is that the dam was certified to NOT be an LH carrier and thus the stockhaarig puppies were NOT of the LH genotype. This is not the same as finding the genetic signature of the stockhaar since many, probably most, longhair carriers are NOT stockhaars.
If you read that item carefully, you will see that a number of unsupported assumptions are made based upon a single litter, which brings up my favourite parable where such things are concerned:

There are three men on a train. One of them is an economist and one of them is a logician and one of them is a mathematician. And they have just crossed the border into Scotland and they see a brown cow standing in a field from the window of the train.
And the economist says, "Look, the cows in Scotland are brown."
And the logician says, "No. there are cows in Scotland of which one at least is brown."
And the mathematician says, "No. there is at least one cow in Scotland, of which one side appears to be brown."

Hehe. I like that parable!

[Steve Graham]

tasha said:

this is why I wanted to find other litters of a similar trait. I do feel one litter is not enough for a significant test.

I'd be happy to maintain a database of information and make it available to all via my web site. This is why I'm getting active on this list, i.e. there are many people here with significant information to contribute.

I've been looking at the German-language list (www.weimaranerforum.de/forum/), but I haven't seen anything on genetic testing there. I'll see if I can get something going.