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Evaluation of rotational grazing as a control strategy for Rhipicephalus microplus in a tropical region.
Research in Veterinary Science ( IF 2.4 ) Pub Date : 2020-04-06 , DOI: 10.1016/j.rvsc.2020.04.006
João Eduardo Nicaretta 1 , Jordana Belos Dos Santos 1 , Luiz Fellipe Monteiro Couto 1 , Luciana Maffini Heller 1 , Leonardo Bueno Cruvinel 1 , Rubens Dias de Melo Júnior 1 , Alliny Souza de Assis Cavalcante 1 , Dina María Beltrán Zapa 1 , Lorena Lopes Ferreira 2 , Caio Márcio de Oliveira Monteiro 3 , Vando Edesio Soares 4 , Welber Daniel Zanetti Lopes 3
Affiliation  

Rhipicephalus microplus is the most significant tick of livestock and its control is particularly challenging due to its resistance to commercial acaricides. Pasture rotation is considered a management strategy that could help control R. microplus, however, the literature only contemplates mathematical models and little is known about the effects of this practice in the field. The objective of this work was to determine whether pasture rotation is an efficient method for controlling R. microplus. Two different experiments were performed that involved groups of continuous and rotational grazing bovines. Female ticks measuring 4.5-8.0 mm were counted on animals while larvae in pasture were counted using the flannel drag technique. Treatment for infested bovines was applied when the average group tick count was ≥30 females. The results showed that rotational grazing (with 20-day periods of rest) had a higher tick count on-host than continuous grazing (P < 0.05) and additional bovine treatment was needed. Sixty and 105 days were needed to re-infest and disinfest pasture of R. microplus larvae, respectively. The first treatment of bovines occurred 91 days after the animals were placed in a closed area. The results indicate that rotational grazing is not an efficient way to control R. microplus.

中文翻译:

旋转放牧作为热带地区小头蛇的控制策略的评估。

Rhipicephalus microplus是家畜中最重要的tick,由于其对商业杀螨剂的抵抗力,其控制尤其具有挑战性。牧场轮换被认为是可以帮助控制细小R. microplus的一种管理策略,但是,文献仅考虑了数学模型,对该领域的实践知之甚少。这项工作的目的是确定轮牧是否是控制小白蚁的有效方法。进行了两个不同的实验,涉及连续和旋转放牧的牛群。用动物绒毛计数4.5-8.0mm的雌tick,同时使用法兰绒拖曳技术对牧场中的幼虫计数。当平均tick虫计数≥30头雌性时,对被感染的牛进行治疗。结果表明,轮流放牧(休息20天)与连续放牧相比,寄主的tick虫计数更高(P <0.05),需要额外的牛处理。重新感染和消灭草食小球藻幼虫分别需要60天和105天。将动物放在封闭区域后91天进行牛的首次治疗。结果表明,旋转放牧不是控制R. microplus的有效方法。
更新日期:2020-04-21
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