Our recent faecal egg count reduction tests (FECRT) results show continuing parasite resistance to triple combination drenches and growing resistance to dual-actives.
We completed nine reduction tests during the 2023-2024 season. All of the nine participating farms tested dual and triple drenches. Fewer farms tested single-acting and novel drenches. The graph below shows the overall results.
It is important to note that this is a small sample size and likely not fully representative of the southern region as a whole, but the results still give some very important insights.
Of concern, we did find some resistance to novel drench Startect on one property as well as further triple resistance – supporting the belief that the battle against internal parasites requires more than just drenching. There are numerous ways to ensure well-grown lambs and a healthy mob in the face of drench resistance. Reach out to your KeyVet for help with which parasite management practices will work best on your property.
Unfortunately, we noted the most resistance across both Trichostrongylus and Teldorsargia (formerly Ostertagia) worm species, as shown in the graphs below.
Faecal egg count (FEC) testing will continue to be your best mode of defense going forward to understand your worm burden and make informed decisions, helping you target an effective treatment plan and have more control over your animal health spend across the season.
