Pasture larval count as a supporting method for parasite epidemiology, population dynamic and control in ruminants
2016
Molento, Marcelo Beltrão | Buzatti, Andréia | Sprenger, Lew Kan
The survival of the nematode parasite free-living stages depends mainly on environmental factors (i.e. rainfall, temperature and relative humidity). To complete its life cycle outside the host the parasite eliminated as eggs in the fecal material, develop to three larval stages before is ingested by the host. Although the presence of infective third stage larvae (L3) on pasture is of great importance for producers and researchers to determine the level of infectivity, the quantification of L3 on pasture is often neglected. Such condition can be determined by pasture larval count (PLC) from a target area. As anthelmintic resistance is widely overspread PLC technique supports population dynamic and epidemiological studies and can be used for measuring the success rate of livestock management strategies under different climatic conditions. The present review article brings together some of the field applications and difficulties to run and interpret this technique, encouraging its use as a diagnostic procedure.
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