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Effects of aging on semen

Equine-Reproduction.com Bulletin Board » General Stallion Questions » Effects of aging on semen « Previous Next »


Author Message
 

cindy houde
Neonate
Username: Pacbreez

Post Number: 1
Registered: 05-2005
Posted on Saturday, June 04, 2011 - 05:43 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Just wondering all the changes that semen might undergo when the stallion gets aged....ie. over 25 let's say. I heard a comment about longer tails on older stallion's sperm -is that true?
 

cindy houde
Neonate
Username: Pacbreez

Post Number: 2
Registered: 05-2005
Posted on Thursday, June 09, 2011 - 11:11 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Any comments??
 

Jos
Board Administrator
Username: Admin

Post Number: 3292
Registered: 10-1999
Posted on Friday, June 10, 2011 - 09:48 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I don't think that longer tails specifically are equated to older stallions. I have seen longer tails on different stallions some of which are younger - in fact a significant difference in sperm size in some stallions.

What one is more likely to see in older stallions is altered morphology - changes to the head, midpiece and tail. It is not going to be universal, and you might see little difference in some stallions, while other stallions are infertile because of the changes. Typically there will be a greater degree of morphological change from the age of 13 up, but I stress again, it is tremendously stallion-individual!

Another issue that is going to be more likely seen in older stallions (and again, by older I mean 13+) is an accumulation issue where there is not a daily shedding of dead sperm in the urine. This can result in a huge build-up of dead sperm that are then released at the time of ejaculation when collected. the end result is significantly lower motility (perhaps 1% total in the worst cases). These will also usually manifest as a huge number of separated heads and tails. Concentration may well be in the billions/ml as well.



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