[Jacob-list] Statistics on white cats

[Neal Grose]

The best test cross should be a moorit, probably a Shetland. Second best is probably a known homozygous white. Given large enough sample size, crossing to white will give you a 50/50 split if only one dominant black is present.

It was a lilac carrier Jacob ram crossed on white Lincoln-Finns that gave me the first clue that something was seriously screwy on our thinking of lilac as a simple recessive. All 13 lambs from 4 white ewes were black or black-piebald. The test cross of lilac ewes to our dear friend Betty’s moorit ram produced all black lambs.

Neal

PS: We were “heired” a white cat with orange-tabby tips and blue eyes by some $%^& driving along the road. I can’t tell that he can hear, but he can purr up a storm. Does the orange mitigate the deafness?

From: Peg Bostwick 
Sent: Saturday, May 04, 2013 8:59 AM
To: 'Linda' 
Cc: jacob-list at jacobsheep.com ; pbpiep at att.net 
Subject: Re: [Jacob-list] Statistics on white cats

Okay – help me out.  I sorted this out mentally once, but have forgotten.  If the lamb got an E+ gene from each parent, would that sheep have black lambs or white?   I really need to try to find my old notes – I was not as good at record keeping early on, at least for the commercial flock.  I know I bred one of the all white lambs to a Jacob ram once, and it had a spotted lamb.  I know I bred one of them to a white, old type merino once, and got an all black lamb.  (I remember that because we kept the black Jacob Merino cross in our flock.)  It also seems to me, though, that they also had white lambs when crossed with our white corriedale – that is where I have to go look for notes.   

 

Peg

 

Peg Bostwick

peg at sweetgrass-jacobs.com

517-626-6981

 

From: Linda [mailto:patchworkfibers at windstream.net] 
Sent: Friday, May 03, 2013 6:24 PM
To: Peg Bostwick
Cc: jacob-list at jacobsheep.com; pbpiep at att.net
Subject: Re: [Jacob-list] Statistics on white cats

 

Got too quick on the send button. The thought on the genetics list was that a Jacob that produced a white lamb when crossbred carries only one dominant black (Ed) gene rather than two. The lamb got the E+ gene instead of the Ed gene. It seems possible that an all white Jacob lamb (all white meaning NO color anywhere including horns and not an albino) may have gotten an E+ gene from each parent. Possible, but maybe not the only explanation. 

I've never actually seen one with no color, but the pictures I've seen have had blue eyes. Do all white Jacobs occur with brown eyes?

I had a white cat with green eyes, who could hear. She was pregnant when she was given to me. She had three blue eyed white kittens - all deaf. I have a calico cat that might as well be deaf for as well as she listens to me.

Linda 

On 5/3/2013 5:31 PM, Linda wrote:

  This topic was recently discussed on the sheep-genetics list in regard to a Jacob ram that sired a white lamb on a Southdown/Shetland cross ewe. The breeder now says the lamb has pale tannish spotting, so may be a different issue.

  On 5/3/2013 9:14 AM, Peg Bostwick wrote:

    Hopefully Ingrid will respond directly – but I did talk to her way back when we had our two white ones, and at that time she gave the “one big spot” explanation.

     

    Peg Bostwick

    peg at sweetgrass-jacobs.com

    517-626-6981

     

    From: jacob-list-bounces at jacobsheep.com [mailto:jacob-list-bounces at jacobsheep.com] On Behalf Of pbpiep at att.net
    Sent: Thursday, May 02, 2013 7:35 PM
    To: jacob-list at jacobsheep.com
    Subject: [Jacob-list] Statistics on white cats

     

    The issue of deafness in white cats is tied to the color of their eyes.  If the white cat has blue eyes, it will be deaf from birth.  If it has one green eye or both eyes are green, the cat can hear.  Your local veterinarian will verify that.

     

    In rabbits the eyes have to be pink, not blue, to be a true albino.  And since many of the Jacobs have blue eyes, if they were a true albino would their eyes also be pink??

     

    What does Ingrid Painter have to say about totally white Jacobs??






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