Lima W S, Ribeiro M F, Guimaraes M P
Universidade Federal de Minas Gerais, Depto de Parasitologia-ICB, PO Box 486, Belo Horizonte, Minas Gerais, 31270-901, Brazil.
Trop Anim Health Prod. 2000 Dec;32(6):375-80. doi: 10.1023/a:1005229602422.
The seasonal variation of the tick Boophilus microplus in the 'Região Metalúrgica' region of Minas Gerais state was studied using 26 Bos taurus (Holstein) x Bos indicus (Gir) calves, of which 16 animals were 3/4 Holstein x 1/4 Gir and 10 were 3/4 Gir x 1/4 Holstein. Monthly tick counts were made between March 1996 and March 1998 and, although B. microplus infestations occurred throughout the year, they were greater during the rainy season. Rainfall was the climatic factor that most affected the seasonal variation. The animals with a preponderance of Holstein blood presented infestations that were significantly (p < 0.05) greater than those of the other cross. Five of the animals (19.2%) maintained 45.5% of the parasite load of the entire group.
利用26头荷斯坦牛（Bos taurus）（荷斯坦）×印度瘤牛（Bos indicus）（吉尔）杂交犊牛，对米纳斯吉拉斯州“冶金地区”微小牛蜱（Boophilus microplus）的季节变化进行了研究，其中16头动物为3/4荷斯坦×1/4吉尔杂交，10头为3/4吉尔×1/4荷斯坦杂交。在1996年3月至1998年3月期间进行了每月的蜱虫计数，尽管微小牛蜱全年都有感染，但在雨季感染更为严重。降雨是对季节变化影响最大的气候因素。荷斯坦血统占优势的动物感染率显著（p < 0.05）高于其他杂交组合。5头动物（19.2%）的寄生虫负荷占整个群体的45.5%。
