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首页> 外文期刊>Journal of Medical Entomology >Therapeutic and persistent efficacy of a single application of doramectin applied either as a pour-on or injection to cattle infested with Boophilus microplus (Acari : Ixodidae)
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Therapeutic and persistent efficacy of a single application of doramectin applied either as a pour-on or injection to cattle infested with Boophilus microplus (Acari : Ixodidae)

机译：一次施用多拉菌素以倾倒或注射的方式治疗感染了Boophilus microplus（Acari：Ixodidae）的牛的治疗和持久疗效

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The efficacy of a single treatment with a pour-on application or a subcutaneous injection of the macrocyclic lactone endectocide, doramectin, was evaluated in separate trials on Hereford heifers infested with Boophilus microplus (Canestrini). Significantly fewer ticks per calf were recovered from both groups of treated animals than from the complimentary untreated calves. The mean weights of engorged females and egg masses from both pour-on-treated and injectable-treated calves were also significantly smaller than the complimentary variables for the two groups of untreated calves. Among the treated groups, the mean weight of females from calves treated with the subcutaneous injection was 55% less than females from cattle that received the pour-on treatment and the weights of egg masses were 71% lighter than those from the pour-on-treated group. The estimates of percentage control for the two treatments were 88.6 for the pour-on formulation and a notably higher 99.8 for the injectable formulation. To obtain estimates of the effect of the treatments on the parasitic stages of the tick, cattle were infested with B. microplus larvae at three weekly intervals beginning 18 d pretreatment to ensure that, on the day of treatment, ticks in all three parasitic stages (adult, nymph, larva) would be on the cattle. The effect of the treatments on each parasitic stage was estimated by partitioning detached females into three groups by noting in which of the three 7-d intervals after detachment of engorged females began that detachment occurred. There was no difference for either the pour-on or injectable in the effect of the specific treatment on each parasitic stage. The persistent efficacy of the pour-on treatment against larvae placed on the hosts 1 wk after treatment was zero. The persistent efficacy of the injectable treatment ranged from 100 to 82.1% (mean, 93.7%) against the larvae placed on calves the first 3 wk after treatment and was still 44% against the fourth weekly posttreatment infestation. The injectable doramectin is a potential alternative to the coumaphos product now used as a precautionary treatment at USDA, Veterinary Services, Livestock Import Stations, for cattle exported from Mexico.
机译：在单独的试验中，对感染了微小杆菌（Canestrini）的赫里福德小母牛进行了单次浇注或大环内酯内切菌素多拉菌素皮下注射治疗的疗效。与免费的未治疗小牛相比，两组治疗的动物每只小牛的tick虫数量明显减少。灌注处理和注射处理的犊牛的饱腹雌性和卵重的平均重量也显着小于两组未经处理的犊牛的互补变量。在治疗组中，经皮下注射处理的犊牛的雌性平均体重比接受了泼洒处理的牛的雌性平均体重减轻了55％，而蛋重比由泼洒处理的牛的体重减轻了71％。治疗组。浇注配方的两种处理的控制百分比估计值分别为88.6和注射配方的99.8。为了获得治疗对the虫寄生阶段的影响的估计值，在预处理前18天开始，每三个星期对牛进行一次B.microplus幼虫侵染，以确保在治疗当天，所有三个寄生虫阶段都出现tick虱（成年，若虫，幼虫）都在牛身上。通过将脱离的雌性分为三组来评估治疗对每个寄生虫阶段的效果，方法是注意在膨大的雌性脱离后的三个7-d间隔中哪个开始发生脱离。在每个寄生虫阶段，具体处理的效果在浇注或注射方面均无差异。泼洒处理对放置后1周的宿主幼虫的持久效力为零。注射治疗的持久效力在治疗后第一个3周时对放置在犊牛上的幼虫为100％至82.1％（平均为93.7％），而对治疗后第四个星期的侵袭仍为44％。可注射的多拉菌素是目前在美国农业部，兽医服务，牲畜进口站用于预防从墨西哥出口的牛的预防性治疗的库马磷产品的潜在替代品。

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