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When to vaccinate breeding stallion

Equine-Reproduction.com Bulletin Board » General Stallion Questions » When to vaccinate breeding stallion « Previous Next »


Author Message
 

Cathy
Posted From: 67.129.136.122
Posted on Sunday, November 21, 2004 - 12:25 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have been told that I should vaccinate my stallion at least 60 days before the breeding season, as the vaccine can have a detrimental effect on his sperm. Is this true? Cathy
 

Pat Wiles
Nursing Foal
Username: Tajsultani

Post Number: 12
Registered: 06-2005
Posted on Friday, June 03, 2005 - 11:59 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have never heard of that causing a problem - we never had any problems with our boys. Perhaps someone was confused and the worry is about them not developing immunities in time for strange horses coming in?
 

Jos
Board Administrator
Username: Jos

Post Number: 10130
Registered: 10-1999
Posted on Saturday, June 04, 2005 - 11:37 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Any time a horse is vaccinated - stallion or mare - there is a possibility of a transient increase in temperature (fever) as a result of the body's response to the disease being vaccinated against. That transient increase, if it lasts long enough, can have a detrimental effect on stored and in-the-process-of-manufacture sperm, which must be stored at a few degrees below normal body temperature (hence testicles outside the body cavity rather than inside like the ovaries). It takes about 57 days to produce a sperm from scratch, so the suggestion of 60 days will allow the passage of all the potentially affected sperm.

Realistically, such reactions to a vaccine are comparatively rare. Should one vaccinate 60 days prior to the breeding season? Well, if you're planning ahead and have that option, sure, it's a good idea. If one gets within 60 days of the season should one then not vacccinate to avoid a possible sperm problem? No - the vaccination should definitely be done. The risk of a sperm problem is far outweighed by the increase in risk to the horse by not vaccinating.



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