Worm Resistant Sheep? 

How do you breed worm resistant sheep?

Internal parasites are the largest economic health problem in worldwide sheep farming systems and are the cause for more lamb deaths than any other individual factor

The industry combats worms by treating with anthelmintic drugs but resistance to these drugs is becoming more common, they are no longer working with full efficacy 

All sheep have the natural ability to combat these internal worms  and like all traits some sheep exhibit higher resistance to worms than others

We just measure this ability in our lambs by doing individual Faecal Egg Counts (this is done by registered technicians ), recording this data over many generations and selecting animals that are genetically resistant to worms just as we select animals that are better mothers or have better carcass attributes 

The result is that we have bred ewes that ingest and kill more worm eggs , this leaves fewer eggs on the pasture for young susceptible lambs to ingest and leaves all stock healthier  

Trials 

We conducted trials along with Bristol University in 2014 to measure the difference in worm resistance between our best and worst ewes 

The ewes that we predicted would have the better worm resistance were shedding up to 50% fewer worm eggs than the  control group

See the attached report for details

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