Preventive and acaricid efficacy against Rhipicephalus microplus of abamectin association with fluazuron in artificially infested cattle

  • Cristiane Nunes Coelho
  • Diefrey Ribeiro Campos
  • Bárbara Rauta de Avelar
  • Gabriela Ferreira Oliveira
  • Priscila Cardim de Oliveira
  • Raphael Comissário Melo
  • Thaís Ribeiro Correia
  • Fabio Barbour Scott
Keywords: Control, Rhipicephalus microplus, ruminants

Abstract

The purpose of the research was to evaluate the acaricide and preventive efficacy of association abamectina 0.6% and fluazuron 3.0% in control of Rhipicephalus microplus in artificial infestations cattle. Were selected 12 cattle, that were kept stabled, crossbreeds Gir x Dutch, males, composing six animals per group. The control group animals received no treatment, while animals in the treated group received the formulation within the association in a single dose of 600 mcg of abamectin and 3 mg of fluazuron per Kg of body weight by route “pour-on”. The infestations on the control and treated groups were performed with 2500 larvae of Rhipicephalus microplus, in days -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -2, -1and the collecting of engorged females it was performed in days -3 to +91, daily. To evaluation the preventive efficacy, the infestations continued in days +7, +14, +21,+28, +35, +42, +49, +56, +63, +70 and the collecting of engorged females followed daily until day +94. The efficacy against reinfestation was calculated on days +7, +14, +21, +28, +35, +42 +49, +56, +63 and +70. Statistical analysis between the average engorged females recovered between the groups control and treated showed that there was a significant difference (p≤0,05) for all subsequent time taken to treatment. The tested product showed acaricide effectiveness results of 0,00%; 6,81%; 62,64%; 85,11%; 98,38%; 97,38%; 96,84%; 97,63%; 98,14%; 97,32%; 97,54%; 98,11%; 99,22%; 97,93%; 98,13%; 96,78%; 96,17%; 99,05%; 98,57%; 98,59%; 97,23%; 96,10%; 99,31% respectively for the experimental days +1, +2, +3, +4, +5, +6, +7, +8, +9, +10, +11, +12, +13, +14, +15, +16, +17, +18, +19, +20, +21, +22, +23 for treated group. The mean of the efficacy over the 23 days after treatment was 97,8%. The preventive effectiveness results of 98,12%; 98,68%; 98,36%; 97,88%; 96,76%; 96,45%; 96,84%; 97,03%; 95,36% and 87,07% respectively for the experimental days +7, +14, +21, +28, +35, +42, +49, +56, +63, +70. The association abamectin 0.6% with fluazuron 3.0% was effective against reinfestation by larvae of R. microplus until day 60 after treatment.

Published
2018-05-20

Most read articles by the same author(s)

1 2 3 4 > >>