Horses & Worms – Strongyle Egg Shedding



May 22, 2018 – At Horsemen’s Laboratory we have reviewed the results of over 70,000 samples that we have examined over the 25 years that we have been helping horse owners evaluate their horse’s worm control program.  We compiled the information into a two-part article along with graphs, so our clients and anyone interested can evaluate the data.  We have found that the overall average is 35% positive and 65% negative.  Over 95% of the positive samples are due to strongyle eggs.  We are unable to determine whether these are eggs from large strongyles or small strongyles because their eggs all look the same.  However, since the introduction of ivermectin dewormer in 1981, most large strongyles have been killed off, therefore through research it has been determined that over 90% of strongyle eggs passed by horses are from small strongyles.  Therefore, all of the data we reference refers to small strongyles.


Visit our website at: to read the complete article and to view the informational graphs.


In order to follow the new worm control program in horses, the first step is to start doing fecal egg counts on the horses periodically.  Horsemen’s Laboratory has been performing fecal egg counts through the mail for over 25 years.  Most of our clients have expressed a deep appreciation for how convenient our service is and the peace of mind that knowing their horses’ worm control program is effective.  If your horse has not been dewormed for 3 months or more now is the time to order our postage paid sample containers and have a fecal egg count done.  Order now at or call (800) 544-0599.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s