THE BAERMANN TECHNIQUE FOR ESTIMATING PROTOSTRONGYLUS INFECTION IN BIGHORN SHEEP: EFFECT OF LABORATORY PROCEDURES

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Abstract
The modified Baermann funnel technique was evaluated to determine the effects of time of baermannization, fecal preparation, type and size of funnel, and type of filter on the number of 1st stage larvae of Protostrongulus spp. recovered from feces of Rocky Mountain bighorn sheep (O. canadensis). More larvae were recovered whe fecal pellets were baermannized for 24 h compared to 8 h, and when feces were crushed than when left intact. Use of small funnels resulted in the recovery of more larvae per gram of feces than larger funnels, and glass funnels more than plastic ones. There was no difference in recovery of larvae between cheesecloth filters and cellulose filters.

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