Influence of grooming on Rhipicephalus microplus tick infestation and serum cortisol rates / Influência da autolimpeza na infestação pelo carrapato Rhipicephalus microplus e níveis de cortisol sérico
Ferreira Pessoa, Fernanda; Maria Roncato Duarte, Keila; Morita Katiki, Luciana; Macedo de Toledo, Luciandra; Kinney Ferreira de Miranda Santos, Isabel; José Veríssimo, Cecília.
B. Indústr. Anim.;
69: 62-62, 2012.
Artigo
em Português
| VETINDEX
| ID: vti-467390
Resumo
Grooming is an important factor on animal resistance to ticks. Rhipicephalus microplus is the most pathogenic cattle tick in Brazil causing death in susceptible animals. Cortisol is the hormone of stress. The influence of grooming on tick infestation and serum cortisol level was studied in 16 Holstein heifers from fifth to eight-month-old. They were infested with 10,000 larvae in June/20/2011. Half of them used a necklace made of wood strips and had an infestation chamber made by cotton cloth covering about 50 cm diameter of the shaved flank, fixed at the skin in both sides with adhesive to prevent larvae to escape from the infestation chamber and the amount of larvae was divided into the two chambers. Such artifacts had the purpose to avoid grooming. The heifers remained all the tick parasitic life cycle in individual pens inside a closed shed at Instituto de Zootecnia, in Nova Odessa, São Paulo State. Tick females bigger than 4.5 mm were counted in the right side from day 20 to 22 after the artificial infestation. The tick recovery rate was calculated by adding and multiplying by two the number of ticks counted, assuming that 5,000 female larvae had infested the cattle. Immediately before infestation (day 0) and in day2, day8, and day17 after infestation, blood samples were collected using vacuum tubes, in the morning (8:30 10:00 A.M.). Cortisol was measured by immunoassayO artigo não apresenta resumo em português.
Biblioteca responsável:
BR68.1
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