Blackleg, pulpy kidney (enterotoxaemia), black disease, tetanus, and malignant oedema are common causes of death in unvaccinated sheep and cattle. Other animals, particularly goats, are also susceptible.
Seen mostly in lactating beef cows in winter and early spring, grass tetany can lead to the death of most clinically affected animals. The disorder is associated with low levels of magnesium in the blood.
Milk fever is a disorder mainly of dairy cows close to calving. Between 3% and 10% of cows in dairying districts are affected each year, with much higher percentages occurring on some properties.
A key component of current best practice for the management of resistance in sheep is the use of multiple actives administered at the same time, or combination drenches. Now resistance is also looming as a real threat for cattle farmers.
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