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

[Meg Steensland]

Navaj-Churros - rams always seem to have horns - ewes occasionally. Best horned ewe here went to a new PA farm in Jan (happy to give them good genetics)  Have left one ewe with scant horns and 3 w/o  
--- On Thu, 8/5/10, Linda <patchworkfibers at windstream.net> wrote:


From: Linda <patchworkfibers at windstream.net>
Subject: Re: [Jacob-list] Gender Linked Horns, Scurs, & Genetic Letter for Lilac
To: "ranchrat" <ranchrat at telusplanet.net>
Cc: jacob-list at jacobsheep.com
Date: Thursday, August 5, 2010, 6:34 PM


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
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