According to Executive Officer of the WormBoss program, Dr Lewis Kahn, sheep breeders selecting better grown sheep are indirectly selecting for worm ‘resilience’ but this does not improve worm ‘resistance’ because they are separate traits.
“Resilient sheep are those that grow and perform well despite infection from parasitic worms, whereas resistant sheep have a lower level of worm infection because of a better immune response,” Dr Kahn said.
“Resilience is difficult to measure because it is the difference in production between worm-free sheep and when the same sheep are infected. It represents the cost of worm infection not the animal’s ability to resist infection.
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