LUBBOCK, TX – Texas sheep producers could gain another tool against internal parasites as Texas A&M AgriLife researchers work to identify and breed animals with stronger natural resistance. Parasites remain a costly health and productivity problem, especially as resistance reduces the effectiveness of some dewormers.
The research focuses on Dorper and Rambouillet sheep, two breeds widely used across Texas. Researchers measure fecal egg counts and other traits, then incorporate parasite resistance into estimated breeding values that can help producers compare breeding animals.
Sheep showing stronger natural resistance can be retained for breeding and used to improve future generations. Those genetics could eventually move into commercial flocks through ram sales and other breeding programs, potentially reducing dependence on repeated treatments.
Researchers say genetics remain only one part of parasite management. Grazing practices, proper dewormer use and continued selection for resistant animals are still important for protecting flock health and limiting production losses.
The team is also evaluating feed-through fungus products and copper oxide wire particle boluses as additional parasite-control options for sheep and goat operations.
Farm-Level Takeaway: Selecting parasite-resistant genetics could reduce treatment pressure while helping producers protect flock health and productivity.