Resistance to parasite treatments in cattle is a growing crisis that threatens both animal welfare and the viability of beef and dairy systems. Understanding the mechanisms helps design sustainable control strategies.
Anthelmintic resistance represents a slow-moving welfare emergency in cattle farming. The gradual loss of effective parasite treatments will eventually leave farmers without pharmacological options for managing nematode infections that cause weight loss, reduced productivity and welfare compromise. The trend toward resistance is driven by the same dynamics seen in sheep - over-treatment without diagnostic guidance selecting for resistant parasite populations. If effective treatments are lost, the welfare consequences for cattle - particularly in high-risk periods like weaning and first-season grazing - will be severe. The urgency of preserving anthelmintic efficacy through responsible use is as relevant to cattle welfare as to sheep, yet awareness among cattle producers is less developed than in the sheep sector.