Cooperia is the most common worm isolated from cattle dung samples across northern Australia. One reason why it is so commonly found is that it has very high egg-laying potential, with fecundity (daily egg-laying capacity) estimated at up to 2,700 eggs per day, depending largely on the infection dose, with less eggs laid/female/d when higher doses of larvae are ingested.

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Another feature of Cooperia infection is rapid completion of the life cycle within the host cattle, with eggs being laid as soon as 14-16 days after infection.
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