津巴布韦不同品种牛身上的南非山蜱（硬蜱科：钝缘蜱属）感染情况。
Infestations of the bont tick Amblyomma hebraeum (Acari: Ixodidae) on different breeds of cattle in Zimbabwe.
作者信息
Norval R A, Sutherst R W, Kerr J D
机构信息
Veterinary Research Laboratory, Causeway, Harare, Zimbabwe.
出版信息
Exp Appl Acarol. 1996 Oct;20(10):599-605. doi: 10.1007/BF00052810.
Infestations of adults and nymphs of Amblyomma hebraeum were counted on Brahman (Br), Brahman x Simmental (BS), Sanga (Sa) and Hereford (He) steers exposed to infested pastures at Mbizi in southern Zimbabwe in 1986-1987. Herefords were always the most heavily infested, while the Sanga tended to carry the fewest ticks with the Brahman and Brahman x Simmental groups being in between. The ratios of the engorged females on the four breeds were 2.3:1.4:1.4:1.0 for He:Br:BS:Sa. The ratios of the standard nymphs were 2.2:1.4:1.7:1.0 for He:Br:BS:Sa. The results confirm earlier observations in Africa and support the view that there are genetic differences between breeds in the expression of resistance to this tick species.
1986 - 1987年，在津巴布韦南部姆比齐的受蜱虫侵扰的牧场中，对婆罗门牛（Br）、婆罗门牛×西门塔尔牛（BS）、桑加牛（Sa）和赫里福德牛（He）成年牛和若虫身上的希伯莱硬蜱（Amblyomma hebraeum）寄生情况进行了计数。赫里福德牛总是寄生蜱虫最多的，而桑加牛携带的蜱虫往往最少，婆罗门牛和婆罗门牛×西门塔尔牛群体则介于两者之间。四个品种上饱血雌蜱的比例为赫里福德牛:婆罗门牛:婆罗门牛×西门塔尔牛:桑加牛 = 2.3:1.4:1.4:1.0。标准若虫的比例为赫里福德牛:婆罗门牛:婆罗门牛×西门塔尔牛:桑加牛 = 2.2:1.4:1.7:1.0。这些结果证实了非洲早期的观察结果，并支持了不同品种在对这种蜱虫的抗性表达上存在遗传差异的观点。
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