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Faecal egg counts in Australian pasture-based dairy herds
T Loughnan1, P Mansell2, M Playford3
1Dairy Residency Program, The University of Melbourne/Colac Veterinary Clinic, 38 Skene St, Colac, Victoria 3250, Australia.
Summary
A sensitive faecal egg count (FEC) test (≥2.5 epg) effectively identifies gastrointestinal parasites in recently calved dairy cows. This method revealed higher infection rates, particularly in primiparous and low-condition multiparous cows, warranting further research into anthelmintic use.
Area of Science:
- Veterinary Parasitology
- Ruminant Health
- Dairy Cattle Management
Background:
- Routine anthelmintic programs are common in Australian dairy systems, but resistance is a concern.
- Variable milk production benefits from anthelmintics have been reported globally.
- Gastrointestinal parasite prevalence and impact in recently calved cows require further investigation.
Purpose of the Study:
- Identify predominant gastrointestinal parasites in recently calved dairy cows in south-west Victoria.
- Examine the relationship between faecal egg counts (FEC) and cow/management factors.
- Evaluate the impact of increased FEC test sensitivity on parasite detection rates.
Main Methods:
- Conducted a study on 18 pasture-based dairy farms in south-west Victoria.
- Measured individual FECs (minimum detectable FEC of 2.5 epg) and performed group larval cultures.
- Collected farm management and cow data (body condition score, age, anthelmintic history) for analysis.
Main Results:
- 35% of cows had FEC ≥2.5 epg (45% primiparous, 26% multiparous).
- Ostertagia ostertagi was the most common nematode; Cooperia spp. were also present.
- Low body condition multiparous cows (<4 BCS) were more likely to have FEC >5 epg.
Conclusions:
- Sensitive FEC testing (≥2.5 epg) is effective for detecting parasitism in recently calved dairy cows.
- Increased test sensitivity significantly raised positive FEC rates, highlighting underdiagnosis with less sensitive methods.
- Further research is needed on sensitive FECs, production impacts, and optimal anthelmintic strategies in dairy cattle.
