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首页> 外文期刊>The Bovine Practitioner >Effects of Short-term Exposure of Feeder Cattle to Calves Persistently Infected with Bovine Viral Diarrhea Virus
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Effects of Short-term Exposure of Feeder Cattle to Calves Persistently Infected with Bovine Viral Diarrhea Virus

机译：短期饲养牛对持续感染牛病毒性腹泻病毒的犊牛的影响

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Research using 2,954 auction-derived feeder steers and heifers was conducted at a single commercial feedlot in Kansas to determine the effects of testing for cattle persistently infected (PI) with bovine viral diarrhea virus (BVDV) at 10-14 days-on-feed (DOF), and removing them at 13-18 DOF. After removal of test-positive animals, the effect of the short-term exposure (STE) to PI cattle on health, performance and carcass characteristics was determined. The percentage of calves exhibiting signs of illness was increased (P<0.01) in cattle with STE to PI-BVDV. Cattle with no exposure (NE) to PI-BVDV calves had a morbidity rate of 18.8%, while a 29.6% morbidity rate was observed in pens of calves with STE to a PI-BVDV calf. Characterization of the temporal pen morbidity rate of STE and NE calves revealed that 31.7% of all STE and 15.3% of NE illness occurred in the first seven DOF. Additionally, the incidence of cattle treated for bovine respiratory disease in STE calves was 2.17 (95% CI 1.73 to 2.72)initial treatments per 1,000 head-days at risk, whereas the incidence of treatment of calves in NE pens was 1.28 (95% CI 0.98 to 1.68) initial treatments per 1,000 head-days at risk. Short-term exposure to PI-BVDV calves had no effect on retreatment rate, death loss, or performance. There was no evidence of a BVD-PI exposure X sex interaction (P=0.62) for carcasses that graded USDA Choice or better, but there was a main effect of sex (P<0.01). There was evidence of a BVD-PI exposure X sex interaction for Yield Grade 2 or greater carcasses (P=0.03). In this study, testing at 10-14 DOF was too late in the feeding period to eliminate the initial morbidity spike that occurred during 0-7 DOF, and the subsequent morbidity differences between calves with STEor NE to PI calves.
机译：在堪萨斯州的一个商业饲养场中，使用了2954个拍卖派生的饲喂牛he牛和小母牛进行了研究，以确定在饲喂10-14天后持续感染牛病毒性腹泻病毒（BVDV）的牛的检测效果（ DOF），并在13-18 DOF处将其删除。移走测试阳性动物后，确定短期暴露（STE）对PI牛的健康，性能和car体特性的影响。在患有STE的牛中，表现出病征的牛犊百分比增加（P <0.01）至PI-BVDV。没有暴露于PI-BVDV小牛的牛的发病率是18.8％，而在含有STE到PI-BVDV小牛的小牛的笔中观察到的发病率为29.6％。对STE和NE犊牛的暂时性笔发病率的特征表明，所有STE的31.7％和NE的15.3％的疾病发生在前七个DOF中。此外，在有风险的每1,000个工作日中，接受STE犊牛接受牛呼吸道疾病治疗的牛发生率是2.17（95％CI 1.73至2.72），而NE围栏中的犊牛发生率是1.28（95％CI 0.98至1.68）处于风险中的每1000个工作日的初始治疗。短期暴露于PI-BVDV小牛对再治疗率，死亡损失或性能没有影响。没有证据表明对USDA Choice级或更好的cas体进行BVD-PI暴露X性别相互作用（P = 0.62），但主要影响是性别（P <0.01）。有证据表明2级或更高屠体的BVD-PI暴露X性相互作用（P = 0.03）。在这项研究中，在饲喂期间以10-14 DOF进行测试为时已晚，无法消除在0-7 DOF期间发生的初始发病率峰值，以及随后在STEor NE与PI犊牛之间的发病率差异。

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