Department of Livestock and Pasture Science, University of Fort Hare, P. Bag X1314, Alice 5700, South Africa.
Vet J. 2010 Apr;184(1):71-6. doi: 10.1016/j.tvjl.2009.02.014. Epub 2009 Sep 4.
A survey was conducted to determine the seroprevalence of tick-borne diseases (TBD) in Nguni and non-descript cattle on the sweet and sour communal rangelands across seasons. Body condition scores, bodyweights, packed cell volume (PCV) and antibodies to B. bovis, B. bigemina, Ehrlichiaruminatium and Anaplasma marginale were determined seasonally in 144 cattle raised on communal rangelands from August 2007 to April 2008. Approximately 45% of the cattle were seropositive for B. bovis, 46% for B. bigemina and 26% for A. marginale. All animals were seronegative for E. ruminantium. Nguni cattle had lower (P<0.05) seroprevalence for A. marginale and B. bigemina in the cool-dry and hot-wet seasons. Cattle in the sweet rangeland had significantly lower seroprevalence of B. bovis and B. bigemina in all the seasons. Infection with B. bovis and B. bigemina negatively affected (P<0.05) bodyweight and body condition scores whilst B. bovis and A. marginale infections significantly affected PCV. The seroprevalence of TBD was lower in the Nguni breed. More work is required to understand the mechanisms of the adaptation and possible resistance of Nguni cattle to TBD.
对甜酸公共牧场的 Nguni 牛和非描述性牛进行了一项调查，以确定蜱传疾病（TBD）的血清流行率。在 2007 年 8 月至 2008 年 4 月期间，对在公共牧场饲养的 144 头牛进行了季节性身体状况评分、体重、红细胞压积（PCV）和抗牛分枝杆菌、双芽巴贝斯虫、无形体和边缘无浆体的抗体测定。大约 45%的牛对 B. bovis 呈血清阳性，46%对 B. bigemina 呈血清阳性，26%对 A. marginale 呈血清阳性。所有动物对 E. ruminantium 均呈血清阴性。在凉爽干燥和炎热潮湿季节，Nguni 牛的 A. marginale 和 B. bigemina 血清阳性率较低（P<0.05）。在甜草地带的牛在所有季节的 B. bovis 和 B. bigemina 血清阳性率均明显较低。B. bovis 和 B. bigemina 的感染对体重和身体状况评分有负面影响（P<0.05），而 B. bovis 和 A. marginale 的感染对 PCV 有显著影响。TBD 的血清流行率在 Nguni 品种中较低。需要进一步研究以了解 Nguni 牛对 TBD 的适应和可能的抗性机制。
