Ivermectin treatment failure on four Irish dairy farms
Posted on 2019-05-15 - 05:00
Abstract We report on the use of the faecal egg count reduction test to evaluate the performance of ivermectin in treating gastrointestinal nematode infections in first grazing season (FGS) calves on four dairy farms in Co. Kilkenny, Ireland. On each farm, FGS calves were injected subcutaneously with ivermectin in accordance with their live weight (day 0). Calves were individually faecal sampled on both day 0 and day 14. Faecal egg counts were determined using the Mini-FLOTAC technique. Composite faecal cultures for each farm were performed on each sampling occasion. The faecal egg count reductions (mode) ranged from 17.3–80.2% with the lower 95% confidence limit ranging from 3.1–72.3% on the four farms, respectively. Ivermectin-resistant nematodes were detected on all farms, with evidence of Ostertagia resistance on one farm. This study highlights the urgent need for Irish producers to reappraise their parasite control practices.
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O’Shaughnessy, James; Drought, Yvonne; Lynch, John; Denny, Marian; Hurley, Christine; Byrne, William; et al. (2019). Ivermectin treatment failure on four Irish dairy farms. figshare. Collection. https://doi.org/10.6084/m9.figshare.c.4506920.v1
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AUTHORS (9)
JO
James O’Shaughnessy
YD
Yvonne Drought
JL
John Lynch
MD
Marian Denny
CH
Christine Hurley
WB
William Byrne
MC
Mícheál Casey
TW
Theo Waal
MS
Maresa Sheehan