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Abnormal sperm

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Anonymous (142.59.191.71)
Posted on Tuesday, July 31, 2001 - 10:27 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I am relatively new to this horse breeding business however, I have a question. I have bred my mare this year to a relatively young stallion. In both shipments of semen when my vet has looked at it under a microscope the motility has been very good, however, there have been lots of abnormal sperm. Some of the sperm have double heads, others broken tails. I know this will potentially reduce the chances of my mare getting pregnant. What is the standard protocol when dealing with the stallion owner?
 

Kelly (63.172.47.196)
Posted on Tuesday, July 31, 2001 - 12:20 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I would ask the vet that collected the stallion, what the sperm looked like before shipping. Your Vet could speak with him and relay what his findings were. They may decide that based on those findings, a change of protocol may be in order.

There are many different variables that can effect the sperm. The counts before and after shipping should be discussed. Regardless of the abnormal sperm, what % of the sperm was progressively motile? Shock incurred during the cooling or warming process can adversely effect the sperm. It is best if both vets can work together on this problem.

If the problem is found to be solely the responsibility of the stallion, the owner should reconsider the fees that you have paid for breeding.
 

Noble Knight (206.157.249.103)
Posted on Thursday, August 02, 2001 - 05:22 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

You didn't say what "lots" is but normally up to 25% abnormal sperm cells is acceptable. The fertility of a sample should be evaluated on a number of criteria including the volume, concentration, rate of forward movement and in-vitro environment survival. You can have a sample with a high abnormal count and maybe 35% alive and normal, but if those that are alive and well have the forward movement of a locomotive and live for 3 more days your mare should be in foal. If you are concerned about it and your mare is not in foal, Kelly has offered good advice.



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