RESUMO O objetivo deste estudo foi avaliar o efeito in vivo e in vitro do óleo de citronela (Cymbopogon nardus (L.) Rendle) no carrapato de bovinos (Boophilus microplus). O óleo foi obtido de folhas frescas pelo processo de destilação e o rendimento foi de 0,7%. Para as experimentações in vitroforam usadas sete (0; 0,5; 1,0; 10,0; 25,0; 50,0; 100,0%) e nove (0,1; 0,25; 0,5; 1,0; 2,0; 10,0; 25,0; 50,0; 100%) concentrações de óleo de citronela, sendo testadas em fêmeas ingurgitadas. A eficácia observada foi de 0; 44,2; 92,1; 85,6; 87,8; 87,0; 88,9 e de 0,7; 2,8; 51,6; 79,3; 81,0; 87,1; 86,7; 89,5%, respectivamente 0.7%. Seven (0; 0.5; 1.0; 10.0; 25.0; 50.0; 100.0%) and nine (0.1; 0.25; 0.5; 1.0; 2.0; 10.0; 25.0; 50.0; 100.0%) concentrations of citonella oil were used on in vitro trials with engorged female ticks. The efficacy control ticks was 0; 44.2; 92.1; 85.6; 87.8; 87.0; 88.9 and 0; 0.7; 2.8; 51.6; 79.3; 81.0; 87.1; 86.7 89.5 %, respectively. These sugest that the citronella oil can be practical used for controlling of catle ticks. ABSTRACT This research was aimed at evaluating in vitro and in vivo effects of citronella (Cymbopogon nardus (L.) Rendle) oil on catle ticks. The volatile oil was obtained from de fresh leaves of citronella grass by steam destilation and the yelds was
RESUMO: Dezesseis vacas de raça Holandesa em lactação foram utilizadas para avaliar o efeito da administração de alho na alimentação sobre a alteração da carga de carrapato, mosca-dochifre, mosca dos estábulos e mosca doméstica. Os tratamentos (T) foram constituídos por controle negativo (T1), alho a 100 g (T2) e 200 g vaca -1 (T3), por três dias, e o amitraz a 0,025% (T4). Para avaliação, foram contadas as fêmeas ingurgitadas de carrapato com comprimento superior a quatro mm e as moscas, antes da aplicação e no 1, 2, 3, 4, 5, 6, 7 rd days after treatments, milk samples were collected to evaluate organoleptic properties in raw milk and in "Minas-Frescal" cheese. Tick mean values were 188. 44, 106.28, 108.10, and 7.60%, respectively, relative to those of the pretreatment. Commercial ectoparasiticide was the most efficient (p<0.05) for tick control. On the 14 th day, garlic-treated animals (T2) had a reduced tick number, and T2 and T3 had a tick number similar (p>0.05) to that of the chemical product (T4). In these treatments, no garlic flavor or taste was detected in milk and cheese. There was no difference (p>0.05) among treatments for fly control.
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