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Vaccinations prevent ewes suffering from disease by boosting their immunity. Ewes are given a booster vaccination before lambing so that immunity to disease is passed to the lamb when it drinks colostrums. The main germs of importance to the flock are the clostridial bacteria which cause diseases such as tetanus and Pasturella bacteria which cause pneumonia. New ewes introduced into the flock need to have a programme of vaccination which involves two injections of vaccine given 6 weeks apart.
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