Boophilus micropius tick instar counts on a crossbred herd

Authors

  • Cecília José Veríssimo Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Nova Odessa, SP
  • Roberto Gomes da Silva Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Melhoramento Genético Animal, Jaboticabal, SP
  • Antonio Álvaro Duarte de Oliveira Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Nova Odessa, SP
  • Wander Ramos Ribeiro Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Nova Odessa, SP
  • Uriel Franco Rocha Universidade de São Paulo, Instituto de Ciências Biomédicas, Departamento de Parasitologia, São Paulo, SP

Keywords:

tick, Boophilus microplus, instar, crossbred, cattle

Abstract

Boophilus microplus tick instar counts were made on a sample of each lot of a crossbred herd raised at the €œEstação Experimental de Zootecnia de Colina€, north of São Paulo State, Brazil, in the middle of each season, from summer 1986 to fall 1987. The objective of the study was to assess for some genetic and environmental effects that might be affecting the instar ticks on the herd. Counts (n= 433) of larval, nymphs, males and females were analyzed by the least squares method, using counts (x) transformed to ln (x+2) and having the followed fixed effects: sire breed group, season, age, pasture and kind of grass. The results showed that the young animals (‰¤ 6 months) were less infested (P<0,01) with nymphs, males and females than did the old ones (> 6 years). Animals grazing on newly- formed pastures (after two years crop on the area) had less larval instar counting than did those on spelling and continuously grazed pastures (P<0,01). The season effect affected all instars (P<0,01), being the lower number of them observed in summer 1987, following four strategical dippings performed at 21 days interval just after the spring count. Grass species and sire breed group affected (P<0,05) the nymphs and females ticks, respectively.

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Published

2013-12-05

Issue

Section

ANIMAL BREEDING

How to Cite

Boophilus micropius tick instar counts on a crossbred herd. (2013). Bulletin of Animal Husbandry, 54(2), 19-24. http://bia.iz.sp.gov.br/index.php/bia/article/view/955

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