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Updated: Jul 18, 2026

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Adjusting worm egg counts for faecal moisture in sheep.

L F Le Jambre1, S Dominik, S J Eady

  • 1CSIRO Livestock Industries, FD McMaster Laboratories, Locked Bag 1, Armidale, NSW, Australia. leo.lejambre@csiro.au

Veterinary Parasitology
|December 26, 2006
PubMed
Summary

Faecal moisture dilutes worm egg counts (WEC) in sheep, affecting parasite treatment decisions. Adjusting WEC for faecal consistency score improves accuracy, providing a more reliable estimate of gastrointestinal nematode infections.

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Area of Science:

  • Veterinary Parasitology
  • Animal Science
  • Agricultural Research

Background:

  • Worm egg count (WEC) in faeces is crucial for managing gastrointestinal nematodes in livestock.
  • Diarrhoea can increase faecal moisture, potentially diluting WEC and leading to underestimation of parasite burden.
  • Accurate WEC is vital for determining anti-parasite treatment needs and selecting animals for worm resistance.

Purpose of the Study:

  • To quantify the effect of faecal moisture on worm egg counts (WEC) in sheep.
  • To evaluate the utility of faecal consistency score (FCS) as a predictor for adjusting WEC for faecal moisture.
  • To develop a more robust method for estimating true WEC in sheep faeces.

Main Methods:

  • Simulated WEC in 15 sheep dosed with chromic oxide particles to control for faecal moisture.

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  • Analysis of the relationship between faecal moisture, dry matter, and simulated WEC.
  • Examination of faecal consistency score (FCS) against dry matter and simulated WEC in 368 field samples.
  • Development and comparison of adjustment factors based on dry matter and FCS.

    • Main Results:

    • Simulated WEC decreased as faecal moisture increased.
    • Drying faeces to a unit dry matter removed the influence of initial moisture on WEC.
    • Faecal dry matter and simulated WEC showed an exponential decline with increasing FCS.
    • A linear decline in dry matter was observed as FCS increased in field samples.
    • Developed adjustment equation: WEC(estimated)=(WEC(observed)/(34.21-5.15 FCS))x29.06.

    Conclusions:

    • Faecal moisture significantly impacts WEC, necessitating adjustments for accurate assessment.
    • Faecal consistency score (FCS) provides a practical means to adjust WEC for faecal moisture.
    • The proposed adjustment equation offers a more robust estimation of WEC, particularly for samples with higher FCS.
    • Further research is needed to assess the impact of FCS-based WEC adjustments on treatment decisions and breeding values.