An experiment comparing critical slaughter results with egg count data collected ante mortem is described.
Haemonchus contortus was prevalent from December to April; Ostertagia spp. from October to December; Trichostrongylus spp. from July to August.
No obvious trends were discernible either with Oesophagostomum columbianum or Nematodirus spathiger, although larval stages of both species were plentiful from
mid-summer to autumn.
Strategic dosing is recommended in October, December and April.
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