Mattioli R C, Dampha K, Bah M, Verhulst A, Pandey V S
International Trypanotolerance Centre, Banjul, Gambia.
Prev Vet Med. 1998 Feb 27;34(2-3):137-46. doi: 10.1016/s0167-5877(97)00082-2.
The effect of tick infestations on liveweight gain (LWG) was assessed by comparison of weight changes in flumethrin-treated N'Dama and Gobra zebu cattle (16-20 months old) with respective control groups submitted to natural tick challenge over 1 year. Flumethrin was applied monthly, fortnightly or weekly. Preventive treatments against anaplasmosis, babesiosis and trypanosomosis were given. Mortality rate was recorded and post-mortem examinations carried out. In both treated and control animals, significantly fewer Hyalomma spp. and Amblyomma variegatum were found on N'Dama than on Gobra zebu cattle. Both breeds are equally susceptible to Rhipicephalus senegalensis infestation. Total annual tick burdens did not cause significant differences in LWG between acaricide-treated and control cattle in either breeds. LWG was also not affected during or after the annual peak of tick infestation (composed mainly by A. variegatum and R. senegalensis). Equally-high mortality (35%), due to unidentified causes, was recorded in acaricide-treated and control Gobra cattle; mortality in N'Dama cattle was 7.5%. In both breeds, about the 90% of mortality occurred at the end of the dry season. Breed differences in tick burden confirm previous results. If tick-borne infections do not influence LWG or mortality, then it is concluded that intensive tick control is not justifiable in Gambian livestock.
通过比较氟氯氰菊酯处理的恩达马牛和戈布拉瘤牛（16 - 20月龄）与相应对照组在1年的自然蜱虫叮咬挑战下的体重变化，评估蜱虫侵扰对体重增加（LWG）的影响。氟氯氰菊酯每月、每两周或每周施用一次。进行了抗无形体病、巴贝斯虫病和锥虫病的预防性治疗。记录死亡率并进行尸检。在处理组和对照组动物中，恩达马牛身上发现的璃眼蜱属和变异革蜱明显少于戈布拉瘤牛。两个品种对塞内加尔璃眼蜱的侵扰同样敏感。在这两个品种中，杀螨剂处理的牛和对照牛的年度总蜱虫负担在LWG方面没有显著差异。蜱虫侵扰的年度高峰期（主要由变异革蜱和塞内加尔璃眼蜱组成）期间或之后，LWG也没有受到影响。在杀螨剂处理的和对照的戈布拉牛中记录到同样高的死亡率（35%），原因不明；恩达马牛的死亡率为7.5%。在这两个品种中，约90%的死亡发生在旱季结束时。蜱虫负担的品种差异证实了先前的结果。如果蜱传感染不影响LWG或死亡率，那么可以得出结论，在冈比亚的牲畜中进行强化蜱虫控制是不合理的。
