Natural infestation by external parasites in beef cattle females in southern Brazil

Revista Brasileira de Zootecnia

Regitano, Luciana Correia de Almeida¹  Alencar, Maurício Mello de¹  Oliveira, Márcia Cristina de Sena¹  Silva, Ana Mary da² 

[1] Embrapa Pecuária Sudeste, São Carlos, Brasil;UFSCar

关键词: Bos taurus x Bos indicus;    Dermatobia hominis;    Haematobia irritans;    Nellore;    Rhipicephalus (Boophilus) microplus    Introdução Os ectoparasitas podem causar prejuízos à bovinocultura de corte;    pois ocasionam perda de peso;    danificam o couro;    transmitem agentes patógenos e/ou produzem lesões que predispõem os animais a infecções secundárias (Honer & Gomes;    1992);   

DOI  :  10.1590/S1516-35982010000700012

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

It was evaluated in this work, the degree of natural infestation by external parasites in beef cattle females from three genetic groups. Countings of cattle tick (Rhipicephalus (Boophilus) microplus), horn fly (Haematobia irritans) and beef-worm (Dermatobia hominis) were performed from July 2003 to December 2004 in females from the genetic groups Nellore (NE), Angus x Nellore (AN), Canchim x Nellore (CN), and Simmental x Nellore (SN) naturally infested. It was realized from 6 to 10 countings in each animal, totalizing 5,384 observations in females at seven physiological stages (calf; empty heifers, pregnant heifers, primiparous cows with or without calf; and pluriparous cows, with or without calf). Data, which were transformed by log10 (n + 1), were analyzed by the least square method with a statistical model that included effects of the female genetic group, of the animal within a genetic group (error a), year-season counting, physiological state, and year-season x genetic group interaction. Differences among genetic groups depended on year-season counting; however, in general, Nellore females were the least infected by ticks, and Angus x Nellore females were the most infected by horn flies and by beef-worms. There was a physiological stage effect of the female in all the three studied characteristics and the differences changed accordingly to the trait. Despite of the counting year-season x genetic group, there are differences among Nellore, Canchim x Nelore, Angus x Nellore and Simmental x Nelore genetic groups regarded to the degree of natural infestation by cattle tick, horn fly and beef-worm.

【 授权许可】

CC BY-NC