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1. What is the difference between resistance to worms and resilience to worms?
2. How much more likely to be flystruck is a sheep with dag score 2 compared with dag score 1?
3. When dipping sheep, regardless of the equipment to be used, what must be achieved if the lice treatment is to be effective?
Resistance to worms: Sheep that are resistant to worms can prevent some or all worms from establishing and as a result have lower worm egg counts.
Resilience to worms: Sheep that are resilient to worms can grow and produce with less ill effects from worms. An animal’s performance for a particular trait, such as growth, will also be dictated by its genetic merit for that trait. So, when comparing two animals with similar Australian Sheep Breeding Values (ASBVs) for growth, a more resilient animal will perform better than a less resilient animal when both have high worm burdens. It is independent of worm resistance so must be selected separately by choosing better production performance.
As dag score increases, the risk of breech strike increases dramatically. A dag score 2 sheep is twice as likely to be struck on the breech as a score 1 sheep. A sheep with dag score 4 is seven times more likely to be struck than a score 1 sheep. The causes of scouring can differ in summer and winter rainfall areas.
Irrespective of the apparatus used to dip sheep, it is essential for lice control that all sheep are wet to skin level at all sites on the head and body.