The Chronicle of the Horse
MagazineNewsHorse SportsHorse CareCOTH StoreVoicesThe Chronicle UntackedDirectoriesMarketplaceDates & Results
 
Page 3 of 3 FirstFirst 123
Results 41 to 49 of 49
  1. #41
    Join Date
    Jun. 16, 2007
    Posts
    1,900

    Default ASD?

    So my question for color people is that if he is homozygous for the silver gene...but has no black to affect his color...is the ASD going to affect his vision? I know it would if he were the silver dapple color with homozygous genetics but he won't BE silver dapple. What do you think? We have a suspected silver dapple Irish Draught cross from a Paint bred mare. I am fairly certain the heterzygous horse is not affected with ASD but I am not sure in this case. Thanks PatO



  2. #42
    Join Date
    Jun. 16, 2007
    Posts
    1,900

    Default Sorry...article about ASD and silver dapples




  3. #43
    Join Date
    Jul. 27, 2005
    Location
    Chapel Hill, NC
    Posts
    3,243

    Default

    Quote Originally Posted by columbus View Post
    Very interesting article. We had our vet do a foal exam at 1 day old and she didn't mention any issues with his eyes. Not that she would be a specialist on optical conditions of horses. So how would you go about finding a vet that is more experienced in that field?
    Worth A Shot Farm
    Finding the horse of your dreams, is always Worth A Shot!
    Visit our Website
    Join us on Facebook
    Watch us on Youtube



  4. #44
    Join Date
    Aug. 28, 2006
    Posts
    10,033

    Default

    There's a Dept of Equine Opthalmology at NCSU; perhaps someone there could help or give a referral.


    1 members found this post helpful.

  5. #45
    Join Date
    Jul. 27, 2005
    Location
    Chapel Hill, NC
    Posts
    3,243

    Default

    Quote Originally Posted by grayarabpony View Post
    There's a Dept of Equine Opthalmology at NCSU; perhaps someone there could help or give a referral.
    Great idea and they are so close too. Thank you!
    Worth A Shot Farm
    Finding the horse of your dreams, is always Worth A Shot!
    Visit our Website
    Join us on Facebook
    Watch us on Youtube



  6. #46
    Join Date
    Dec. 13, 1999
    Location
    Greensboro, NC
    Posts
    36,085

    Default

    Quote Originally Posted by columbus View Post
    I know it would if he were the silver dapple color with homozygous genetics but he won't BE silver dapple.
    "silver dapple" either refers to the silver gene in general, or a black silver specifically, depending on who you talk to.

    Regardless, the issue is the same - it's the ZZ condition which predisposes the horse to ASD. ASD is connected to the silver gene, not the base color
    ______________________________
    The CoTH CYA - please consult w/your veterinarian under any and all circumstances. - ET



  7. #47
    Join Date
    Dec. 27, 2006
    Posts
    529

    Default

    Quote Originally Posted by JB View Post
    Talia, those feet seem to have that same purple hue to them.
    Agreed. They are just... ODD!
    We are all inclined to judge ourselves by our ideals; others, by their acts. ~Harold Nicolson



  8. #48
    Join Date
    Dec. 27, 2006
    Posts
    529

    Default

    Quote Originally Posted by columbus View Post
    So my question for color people is that if he is homozygous for the silver gene...but has no black to affect his color...is the ASD going to affect his vision? I know it would if he were the silver dapple color with homozygous genetics but he won't BE silver dapple. What do you think? We have a suspected silver dapple Irish Draught cross from a Paint bred mare. I am fairly certain the heterzygous horse is not affected with ASD but I am not sure in this case. Thanks PatO
    It is very rare for ASD to affect vision, even amongst homozygous silvers. I spoke to Dr. David Ramsey about this topic personally. He has examined over 2300 silver Rocky Mountain horses, of those horses, two were blind from what "might" have been ASD related eye issues. As a percentage of population, the number of vision impaired silver Rocky Mountain horses is far less than the number of vision impaired horses in say, the entire Quarter Horse breed as a whole.

    Typically ASD causes harmless, non-vision impairing cysts within the eye. This applies to both heterozygous and homozygous silvers. These cysts are painless and non-progressive, they simply just exist and their existence can only be confirmed by a highly trained equine ophthalmologist. (And by highly trained, I mean one that was taught specifically how to identify the cysts. Many seasoned equine ophthalmologists don't know what to look for otherwise and can miss them.) In some rare cases ASD causes overly curved corneas and a bulbous appearance to the horse's eye. This results in temporary nearsightedness, which self corrects by the time the horse reaches 1 year of age. That expression of ASD only seems to affect homozygous silvers.
    Last edited by TaliaCristianna; Apr. 11, 2013 at 11:19 AM.
    We are all inclined to judge ourselves by our ideals; others, by their acts. ~Harold Nicolson



  9. #49
    Join Date
    Dec. 27, 2006
    Posts
    529

    Default

    Here is a link to a transcript of the email conversation I had with Dr. Ramsey back in November of 2012. You probably have to join the group to see it. Unfortunately I don't have it saved anywhere else currently.

    https://www.facebook.com/groups/2692...5062245234188/
    We are all inclined to judge ourselves by our ideals; others, by their acts. ~Harold Nicolson



Similar Threads

  1. Guessing time: What is buried in my front yard?
    By SarahandSam in forum Off Topic
    Replies: 29
    Last Post: Dec. 30, 2012, 01:30 PM
  2. Update, post 32, 2nd guessing future hunter,
    By Pennywell Bay in forum Hunter/Jumper
    Replies: 31
    Last Post: Mar. 15, 2011, 09:06 AM
  3. Replies: 1
    Last Post: May. 30, 2010, 02:39 PM
  4. Replies: 30
    Last Post: May. 3, 2010, 02:26 PM
  5. Help guessing mares color? Updated with dna results post 48
    By alliekat in forum Sport Horse Breeding
    Replies: 49
    Last Post: Apr. 3, 2009, 12:11 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
randomness