[Jacob-list] question on horns

[Jacobflock at aol.com]

In a message dated 4/28/2005 6:12:05 PM Central Standard Time, 
patchworkfibers at alltel.net writes:

> Was it a ewe or ram lamb?  Isn't polled dominant over horned?  I am not 
> sure how it works over hornless. Could the lamb have been phenotype polled, but a
> lso carrying a polycerate gene either as horned or hornless?
>   
>  
> Linda
>  
> 
> On Thu, 28 Apr 2005 10:18:48 -0700 (PDT), Mary Hansson wrote:
> > Fred,
> >
> > I have observed a Cotswold/Jacob cross POLLED animal with a grade 4
> > split......shocked both me and the breeder.  Just another animal
> > that messes with our great theories.
> >
> > BTW:  The little 4-horned ram lamb that was born a couple months
> > back to parents that were/are both 2-horned (at least on visible
> > CLOSE inspection) is one of the prettiest ones in the flock of
> > lambs---markings, horns, fleece, everything.......  Fleece isn't as
> > good (fine) as Nutsy's fleece was, but it is nice.
> >
> > MEH
> >
> > Jacobflock at aol.com wrote:
> >> In a message dated 4/15/2005 8:40:06 PM Central Standard Time,
> >> patchworkfibers at alltel.net writes:
> >>
> >>> I hope someone else will jump in here on this, as I may be
> >>> wrong, but I think that since SUED is linked to the polycerate
> >>> gene, you would most often (but maybe not always) see it on
> >>> four horned animals.  Does sued occur in hornless and/or polled
> >>> sheep?
> >>>
> >>
> >> Split upper eyelid defect is associated with polyceraty and
> >> therer are no reports I am aware of that hint of such a defect in
> >> polled sheep.  As to the "hornless" phenotype the question should
> >> be placed on the table.  There are impediments to answering the
> >> question: the observation in the ewe of the sex-linked "hornless
> >> gene" presented as an aberrant horn and the scur at the lateral
> >> horn location, the willingness to present such a finding which
> >> would suggest other questions.
> >>
> >> Fred Horak _______________________________________________ Jacob-
> >> list mailing list, sponsored by Swallow Lane Farm & Fiberworks
> >> Jacob-list at jacobsheep.com
> >> http://www.pairlist.net/mailman/listinfo/jacob-list
> >
> >
> > Mary Ellen Hansson, MEd, RD, LDN
> > ISeeSpots Farm
> > Jacob Sheep: Lambs, adults, wool
> > www.iseespots.com
> 
> 

The gene that controls polled or horned is located on chromosome 10.  The 
gene that controls multiple horns has not been reported out yet.  The hornless 
gene which produces scurs and aberrant horns is evidenced in the lateral horns 
of ewes.  The gene is known to exist but chromosome location is not known.

The location of the hornless gene may well be on another chromosome IF the 
hornless gene (scurs included) in sheep is siimilar to the gene that produces 
scurs in cattle.  The poll/horn gene in cattle is on ch 1, the scur gene is on 
ch 17 or 19 .. I forget which.

Fred Horak
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