Sheep immunity
- Immunity (or host resistance) is the ability of the sheep to block infection with worms and reject established worms.
- Immunity can be either innate or acquired.
- Innate immunity is the inherent ability of some sheep and breeds to resist infection with worms.
- Acquired immunity develops in sheep after they have been exposed to worms. Most adult sheep have good acquired immunity to worms, whereas lambs do not.
- Acquired immunity takes several months to develop following exposure to worms. During this time animals, such as lambs, will be vulnerable to infection and disease.
- It is important to increase the immunity of young lambs to worms, especially around weaning. The sooner they become immune, the less they will need to be drenched.You can help to improve immunity to worms by implementing some of the other arms of sustainable worm control. These include good grazing management and nutrition, breeding programs and reducing the number of drenches.
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