首页> 外文期刊>The Bovine Practitioner >Comparison of 3-, 5-, and 7-Day Post-treatment Evaluation Periods for Measuring Therapeutic Response to Tilmicosin Treatment of Bovine Respiratory Disease
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Comparison of 3-, 5-, and 7-Day Post-treatment Evaluation Periods for Measuring Therapeutic Response to Tilmicosin Treatment of Bovine Respiratory Disease

机译:治疗后3天,5天和7天评估期的比较,以评估替米考星治疗牛呼吸道疾病的治疗反应

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摘要

Three-hundred steer calves with clinical signs of bovine respiratory disease (BRD) and a rectal temperature of 104°F (40°C) or greater were enrolled in a 56-day study to evaluate the effect of a 3-, 5- or 7-day post-treatment evaluation (PTE) periodon therapeutic response to tilmicosin. Trial calves (average weight 557 Ib; 253 kg) were purchased from livestock auction markets in Colorado, Kansas, Oklahoma and Wyoming, and delivered to the trial site in Wellington, Colorado. Upon randomization to atreatment group, tilmicosin was administered at 4.55 mg/lb (10 mg/kg) of body weight. Three treatment groups were defined by the number of days (3, 5 and 7) post-treatment during which they were not eligible for retreatment for BRD. The 7-day PTE grouphad a significantly higher treatment success rate compared to the 3-day PTE group (P = 0.05). The 3-day PTE group had a higher (P < 0.05) first relapse rate than the 7-day PTE group, and a higher (P < 0.01) second relapse rate than either the 5- or 7-dayPTE groups. There were a total of five BRD-associ-ated mortalities in the study; all occurred within the first eight days of the study. Results from this trial suggest that a 3-day PTE period following tilmicosin administration could result in an overestimation of treatment failure rates compared to a 7-PTE period.
机译:在56天的研究中,入选了具有牛呼吸道疾病(BRD)临床症状且直肠温度为104°F(40°C)或更高的三百头ste牛,以评估3-,5-或治疗后7天(P​​TE)对替米考星的治疗反应。试验小牛(平均体重557 Ib; 253公斤)从科罗拉多州,堪萨斯州,俄克拉荷马州和怀俄明州的牲畜拍卖市场购买,并交付到科罗拉多州惠灵顿的试验地点。随机分配至治疗组后,以4.55 mg / lb(10 mg / kg)体重施用替米考星。通过治疗后的天数(3、5和7)定义了三个治疗组,在此期间它们不符合再接受BRD治疗的条件。与3天PTE组相比,7天PTE组的治疗成功率显着更高(P = 0.05)。 3天PTE组比7天PTE组具有更高的(P <0.05)第一次复发率,并且比5天或7天PTE组具有更高(P <0.01)的第二复发率。该研究中总共有5个与BRD相关的死亡率。所有这些都发生在研究的前八天内。该试验的结果表明,与7-PTE期相比,替米考星给药后3天PTE期可能导致高估治疗失败率。

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