[Jacob-list] Gender Linked Horns, Scurs, & Genetic Letter for Lilac

[Linda]

You might want to get a copy of the 2009 JSBA AGM dvd. Dan Carpenter did 
an excellent presentation on the genetics of lilac. He also has a more 
detailed sheet, although I don't see it online anymore. I have a printed 
copy. I agree with Dan that lilac is a modifier. A problem in Jacobs 
(speaking for myself) is that we haven't really defined just what is a 
lilac. We tend to classify sheep that are not a definite black as lilac, 
which just doesn't work if you are trying to work out genetics.

Suffolk are not horned in either sex, are they?. Karakuls are horned in 
rams/not in ewes. Merino (the old kind, not the new kind) are horned 
rams/not ewes. There are bunch others that I can't think of right off. I 
believe that in Navajo Churro, Shetlands and Icelandic the ewes are 
usually polled, but can be horned.

I hope Fred Horak will jump in here to share some of his past articles 
on scurs and the genetics behind a four horned ewe with strong tops and 
weak laterals.

Thanks to Mark for pointing out how to search the archives, I just 
punched in 'jacob-list scurs' into google and brought up a good dialog 
on horn genetics. There are lots more.

Linda

ranchrat wrote:

>

> Heel low:

>

> Has there been a genetic letter assigned to Lilac and what is it 

> please?   I am being told that other mammals coined "lilac" are 

> recessive brown and recessive blue (b/b d/d genotype), but d (blue) is 

> not found in sheep.  Help?

>

> Which breed of sheep has the sex linked inheritance in horns?  

> Certainly not the Jacob I may presume!

>

> Am being told that in this gender linked horn trait for sheep:  " rams 

> show the trait when they are either homozygous or heterozygous for it 

> and ewes only when homozygous." 

>

> Gonna guess maybe the Sufflolk but that is a weak guess at best!?

>

> Would scurs be a separate gene than full horns (like we see in Jacobs) 

> or is this a modified plus or minus kind of trait? 

>

> Doggone & Chicken UP!

>

> Tara Lee Higgins

>

> Higgins Rat Ranch Conservation Farm, Alberta

>

> -- 

>

> \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

>

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

>

>     ____(\                Tara Lee Higgins                 /)____

>

>    (_____~>    Higgins Rat Ranch - An ACD is for LIFE     <~_____)

>

>   ( ``  ``                Alberta, Canada                  ``  `` )

>

>    \                  ranchrat at telusplanet.net                   /

>

>     )          http://www.wolven.ca/higgins/ratranch            (

>

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

>

> /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

>

> ------------------------------------------------------------------------

>

> _______________________________________________

> Jacob-list mailing list, sponsored by Swallow Lane Farm & Fiberworks

> Jacob-list at jacobsheep.com

> http://www.pairlist.net/mailman/listinfo/jacob-list

>   


-- 
Patchwork Farm Jacob Sheep <http://www.patchworkfibers.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/jacob-list/attachments/20100805/7a34c3ff/attachment-0001.htm>