Diagnostic Laboratory Procedures. Agriculture, Food, and Natural Resource Standards Addressed...
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Transcript of Diagnostic Laboratory Procedures. Agriculture, Food, and Natural Resource Standards Addressed...
Agriculture, Food, and Agriculture, Food, and Natural Resource Natural Resource
Standards AddressedStandards Addressed• AS.07.01. Design programs to AS.07.01. Design programs to
prevent animal diseases, parasites prevent animal diseases, parasites and other disorders and ensure and other disorders and ensure animal welfare.animal welfare.• AS.07.01.01.b. Describe and AS.07.01.01.b. Describe and
demonstrate the proper use and demonstrate the proper use and function of specific tools and function of specific tools and technology related to animal health technology related to animal health management.management.
Microscope UseMicroscope Use• Objective lenses 4x, 10x, and Objective lenses 4x, 10x, and
40x40x• Oil-immersion is used Oil-immersion is used
occasionallyoccasionally• A mechanical stage is necessary A mechanical stage is necessary
to view slides thoroughlyto view slides thoroughly
Microscope UseMicroscope Use• To scan a slide use 4x to To scan a slide use 4x to
focus, then move to 10xfocus, then move to 10x
• Scan back and forth Scan back and forth overlapping each fieldoverlapping each field
Microscope UseMicroscope Use• Debris can be closely Debris can be closely
examined under high examined under high powerpower
Sample Collection• The sample should be
fresh since some parasite eggs become unrecognizable as the feces ages.
Sample Collection• If a fresh sample cannot
be obtained, one can be refrigerated, but for no longer than 24 hours.
Methods1. Gross exam
- observe and record• color and consistency• blood and mucus• age of sample• presence of adult parasites
Methods2. Direct smear
- A small amount of feces is mixed with water and applied directly to a slide.
Methods2. Direct smear
- The main disadvantage of this technique is that a
small sample may not contain any parasite eggs.
Methods3. Floatation
- techniques using this method:
- simple floatation
- use of a centrifuge
- Fecalyzer
Methods3. Floatation
Fecalyzer- uses a solution (zinc sulfate or sodium nitrate) that has a specific gravity greater than the specific gravity of most parasite eggs
Methods4. Sedimentation - The high specific gravity
of these eggs makes it difficult to use floatation techniques without
distorting them.