BY JOHN MCEWAN
It is estimated that approximately 30% of New Zealand’s sheep meat and wool production is dependent on the use of anthelmintics. In economic terms $1200 million worth of sheep exports are supported by the use approximately $80 million of anthelmintic. Alternative methods of controlling internal parasites are needed, because of the widespread anthelmintic resistance by the parasites concerned (greater than 65% of farms have a species resistant to at least one chemical action family) and the costs of the chemical control.
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