Changes in a farm’s land use or policies which result in it having mostly young livestock could be disastrous in promoting the development of drench resistance.
Triple drench resistance is present on a number of sheep farms Beef + Lamb New Zealand’s Wormwise is dealing with.
Shifting away from the common 28-day drench routine could help reduce resistance development and even improve livestock productivity, says an animal health company.
Drench resistance is real, already widespread on sheep farms and heading in the same direction wherever cattle are farmed, says Beef and Lamb NZ.
Treating twin-bearing ewes with anthelmintics has positive results for both the ewe and lamb, as shown by a recent study, says Clive Bingham of Zoetis NZ.
Farmers can no longer simply buy the cheapest drench, assume it is doing a good job of killing worms and not consider the longer term implications, says Jo Houlter, veterinary technical advisor, MSD Animal Health.