Study on Anthelmintic Management Against Damage from Haemonchosis Occurring in Sheep Herds

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  • めん羊牧場における捻転胃虫症の被害と駆虫対策の検討
  • メンヨウ ボクジョウ ニ オケル ネンテン イチュウショウ ノ ヒガイ ト クチュウ タイサク ノ ケントウ

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There was a high incidence of sudden death due to haemonchosis in a sheep herd, where a regular anthelmicticprogram using diethylcarbamazine had been conducted. When a new anthelmintic program using ivermectin (IVM) or levamisole (LEV) was conducted over three years, the mortality apparently decreased fromapproximately 20% to 2.8% in the third year. The anthelmintic effects were poor with minimal reduction in eggper gram (EPG) in the pour-on route of IVM, but were significantly higher with a major reduction in the average EPG from 5418.5 to 3.2 in the subcutaneous route of IVM and from 98.2 to 1.9 in the oral route of LEV afteradministration for one month. However, the anthelmintic effects after two months of administration in the subcutaneousroute of IVM were lower than those of the one-month interval, in which the reduction of EPG wasfrom 120.5 to 41.1, indicating no significance. Moreover, despite the significantly higher anthelmintic effectsat first administration of both IVM and LEV for each year, the EPGs were gradually decreased after the secondadministration. This may indicate the occurrence of drug-resistant worms.

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