Fecal Sampling to Determine Parasite Load

  • theholisticgoat

    August 28, 2023 at 1:25 pm

    Another source for mail-in sample results is https://www.midamericaagresearch.net/instructions.php and from them we get the attached file “Interpretation of Fecal Worm Egg Counts in Sheep, Goats and
    Camelids using the Modified Wisconsin Sugar Flotation Technique.”

    The overall infection process begins when an infected animal grazes a pasture, it sheds worm
    eggs on a daily basis that pass in the manure. These eggs hatch and the larval offspring develop
    into infective larvae which re-contaminates the pasture thus exposing all animal grazing this
    pasture to new infections. If the pasture is already contaminated with infective larvae, the
    animals pick up new infections at the same time they shed eggs back on the pasture contributing
    a future contamination levels. This process continues until the grazing season ends. Depending
    upon temperature and moisture these parasite eggs hatch, develop into infective larvae and move
    away from the manure pats onto the vegetation where the reinfection process begins. The biggest
    and least understood issue with sheep and goats is that once Haemonchus infections reach a high
    level, the physiology of the gut changes. The parasites respond by stopping their development
    undergoing an arrested development period waiting for the physiology of the gut to return to
    normal. This why the simple guide (listed above) to predict parasite levels within an animal
    based on worm egg counts can be misleading.”

    The page above has links to a variety of other resources about parasites that might be worth perusing!

  • Haley

    October 17, 2023 at 12:55 pm

    How To Conduct Modified McMasters Fecal Floatation Test

    The most common and efficient way to obtain fecal egg counts for sheep, goats, young cattle and

    horses is to use the Modified McMaster Test. This is a flotation test that separates parasite eggs

    from debris based on density; the eggs float to the surface of the counting chamber. This test

    uses a special microscope slide with a grid, which makes counting easier”

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    October 17, 2023 at 1:02 pm

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  • Haley

    October 17, 2023 at 1:04 pm

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  • Haley

    October 17, 2023 at 1:05 pm

    Why Do Fecal Egg Counts?

    “Quantitative fecal egg counting is a procedure that determines the number of eggs per gram (EPG) of strongylid eggs, including barber pole worm (Haemonchus contortus), in a fecal sample. Quantitative fecal egg counts can be used along with other information, to design and evaluate a parasite control program. It can also help a producer make breeding decisions and determine the effectiveness of a dewormer.”

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