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If you are restocking it is recommended that you keep the new stock separate from your other stock until you are sure they are not carrying any unwanted parasites. Lice is the obvious pest that sheep producers worry about but don't forget the internal parasites. Get a worm test done when the stock come home or before if possible and then another one 10 to 14 days after drenching (if required) to ensure you haven't bought home resistant worms. It is the cheapest insurance against a possible disaster.
Even if you are not in a "Fluke" area be aware that adult fluke can live a long time and we are seeing fluke in sheep that have been bought home to "Non Fluke" areas, a simple cost effective fluke test should be also carried out on purchased animals.