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… products are administered as a pre-lambing treatment of ewes by about 80% of sheep farmers in New Zealand. Pre-lamb drenching is done as farmers expect that by treating ewes, both ewes and their lambs will be heavier at weaning and … on these animals, it will result in significant production gains. Key results Farmers may not be making money from pre-lamb drenching every year.   If resistant parasites are already on your farm, then using long acting anthelmintics will make the issue worse.   To improve profitability, considering ways of improving lamb drop and lamb survival is likely to be more important than drenching.   There was a change in the rumen microbiome of …