I need a little help from those of you doing your own fecal counts.
I just got my McMaster kit and solution, and tried it out last week on two of my horses, both of whom had been wormed with ivermectin within the past 2 months (so I didn't expect to see much, but I couldn't get the one that's gone 4 months to poop for me on command). Well I didn't find anything that convincingly looked like an egg. But maybe it's just because I was looking for the wrong size objects, as I have no idea how big these eggs are supposed to be. ??
So my question is, how big are strongyle eggs under 10x objective (and 10x occular) lens? The McMaster grid fits pretty nicely with both gridlines just within the frame of view on 10x, but how big are these eggs that I'm looking for? I know they say that they're supposed to be about 90 microns in length, but I don't know what 90 microns looks like under a 10x microscope? Help?!
I know what they are supposed to look like, but I don't know how big I'm looking for. Am I looking for something as big as the one in the picture, or is that magnified? Do they take up half of the field of view or an 8th of the field, or are they about a 20th of the length of the micro field, etc? I will miss them if I'm looking for something bigger than what they really are. Does that make sense?
I'm not really sure how to answer how big they are.......they do vary in size greatly depending on developement and species.......but if you know what they look like they are big enough that you won't miss them.........the picture that comes with your kit is approximately what you will see under the microscope.
Here is a chart.........it gives you a guide of what a hundred um's looks like
My parasite book says they vary in size from 60-120 x 35-60 um
okay thanks. I did a few calculations, looked at a ruler under the microscope and have an idea of what size I'm looking for. I finally got a sample from our horse who is 4 months out from his last worming, so I'm hoping that might show something. . .
Another question- I'm thinking about buying a microscope to use for this at home so I don't have to use our lab's scope frequently, and so I can have the freshest samples possible. Any recommendations on microscopes, where to buy, etc? I'm hoping to find something that will work for this purpose around $200 or less. Thanks!!