The effect of minimum deworming practice with ivermectin for bovine gastrointestinal nematodes in a public pasture

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  • Kitano N.
    Graduate School of Dairy Science, Rakuno Gakuen University
  • Fukumoto S.
    School of Veterinary Medicine, Department of Veterinary Medicine, Rakuno Gakuen University
  • Tokuyama K.
    Boehringer Ingelheim Animal Health Japan Co., Ltd.
  • Ikeda K.
    Boehringer Ingelheim Animal Health Japan Co., Ltd.
  • Takahashi T.
    Graduate School of Dairy Science, Rakuno Gakuen University

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Other Title
  • 公共牧場におけるイベルメクチン製剤の牛消化管内線虫駆虫効果
  • コウキョウ ボクジョウ ニ オケル イベルメクチン セイザイ ノ ギュウ ショウカカン ナイセンチュウ クチュウ コウカ

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Abstract

<p>　Pour-on ivermectin products are effective in controlling gastrointestinal parasites in cattle. In this study, an ivermectin preparation was introduced to a previously untreated public farm in order to establish a suitable deworming schedule.</p><p>　Cows in the test group were treated in May, July and October, while control cows were untreated. In comparison with control cows, treated cows had significantly lower egg counts in June and August. The egg count in the test group was significantly lower in August and October compared to that in July. Furthermore, treated cows had significantly heavier body weight in August compared to that in July as well as a tendency to show better reproduction performance. These positive effects seem to be the result of deworming by the ivermectin preparation.</p><p>　Ivermectin resistance in cattle is widely known in other parts of the world. The deworming schedule with a reduced treatment frequency used in this study may help to minimize the risk of developing such resistance.</p>

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