Menu
Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Forums
Cattle Boards
Breeding / Calving Issues
Dead calf ? Suggestions?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support CattleToday:
Message
<blockquote data-quote="wbvs58" data-source="post: 1523816" data-attributes="member: 16453"><p>There are 2 situations you talking about there.</p><p></p><p>For a normal healthy cow that may have been exposed to a high risk of exposure to BVD antibody levels would be measured and this will only be a guide. BVD in a healthy cow will only be a transient infection, you will not even realise she has been sick. If antibodies were measured early in the infection they would be normal they only increase as she recovers which she will do to a perfectly normal healthy and safe cow. Yes vaccination with a live vaccine will produce high antibody levels as well so will stuff up the results. This test is best done on a sample of cows to get an idea of the prevalence of BVD in a herd.</p><p></p><p>The 2nd situation is if that healthy cow just happened to be at a particular stage of gestation around the 100days from memory and if that calf is not aborted then when born will be a persistant shedder of the virus for the rest of its life and it is these that can be accurately identified with a skin notch test for virus antigen. The only exception would be if the ear notch test was done on the healthy cow above while she had the transient infection or freshly vaccinated with live virus, in this case a 2nd ear notch done a month or two later should the be -ve.</p><p></p><p>You can get a 3rd situation where a calf is infected in utero a bit later in gestation but its immune system is able to overcome the virus but it will be born weak, stunted and some defects but won't show up on an ear notch test.</p><p></p><p>Ken</p></blockquote><p></p>
[QUOTE="wbvs58, post: 1523816, member: 16453"] There are 2 situations you talking about there. For a normal healthy cow that may have been exposed to a high risk of exposure to BVD antibody levels would be measured and this will only be a guide. BVD in a healthy cow will only be a transient infection, you will not even realise she has been sick. If antibodies were measured early in the infection they would be normal they only increase as she recovers which she will do to a perfectly normal healthy and safe cow. Yes vaccination with a live vaccine will produce high antibody levels as well so will stuff up the results. This test is best done on a sample of cows to get an idea of the prevalence of BVD in a herd. The 2nd situation is if that healthy cow just happened to be at a particular stage of gestation around the 100days from memory and if that calf is not aborted then when born will be a persistant shedder of the virus for the rest of its life and it is these that can be accurately identified with a skin notch test for virus antigen. The only exception would be if the ear notch test was done on the healthy cow above while she had the transient infection or freshly vaccinated with live virus, in this case a 2nd ear notch done a month or two later should the be -ve. You can get a 3rd situation where a calf is infected in utero a bit later in gestation but its immune system is able to overcome the virus but it will be born weak, stunted and some defects but won't show up on an ear notch test. Ken [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Cattle Boards
Breeding / Calving Issues
Dead calf ? Suggestions?
Top