Boletim de Indústria Animal (Jan 2010)

Infestation by Rhipicephalus (Boophilus) microplus in heifers from different genetics groups

  • Adilson Marini,
  • Ricardo Veludo Gomes Soutello,
  • Ricardo Lopes dias da Costa,
  • José Henrique Neves,
  • Alex Costa Vacari,
  • Thiago Nunes Barreto,
  • Sidney Monte Junior,
  • João José Assumpção de Abreu Demarchi

Journal volume & issue
Vol. 67, no. 1
pp. 65 – 71

Abstract

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An assessment of the infestation of ticks Rhipicephalus (Boophilus) microplus in 59 heifers of three genetic groups was run: Nellore, Guzerá and ½ Angus x ½ Nellore, belonging to the roster APTA Regional Andradina / SP. Every 28 days held the count of ticks, where the left side of the animal, with evaluation of only engorged females with more than 4.5 mm in the period from June 2007 to May 2008. The genetic group (P 0.05). The count of ticks was higher in the rainy season (4.32 ± 5.20) in comparison with the dry season (3.74 ± 5.54). Despite the higher counts of ticks during the experimental period, in heifers ½ Angus x ½ Nellore, this genetic group obtained the highest average daily weight gain (0.57 kg/day). Heifers and bulls Nellore and Guzerá were not statistically different in relation to daily weight gain, with averages of 0.37 and 0.40kg/day, respectively. ½ Angus heifers genetic group cattle have a higher infestation by ticks.

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