Department of Virology, Parasitology and Immunology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium.
Vet Parasitol. 2010 Jul 15;171(1-2):91-8. doi: 10.1016/j.vetpar.2010.03.006. Epub 2010 Mar 10.
The objective of this study was to determine the prevailing levels of infection with Ostertagia ostertagi in first-season grazing calves and related management factors in three European countries (Belgium, Germany and Sweden). A cross-sectional survey was performed in first-season grazing dairy cattle during 2 consecutive years. Levels of infection with O. ostertagi were assessed by a standardized serum pepsinogen assay at the end of the grazing periods 2006 and 2007 and information on control measures against gastrointestinal nematodes were collected at the same time through a questionnaire. Information was collected from a total of 358 herds in 2006 and 726 herds in 2007. The general infection patterns were similar in the different countries and the 2 years with the majority of the herds having a low (<1 UTyr) or intermediate pepsinogen result (1-3 UTyr) and only 2-6% of the herds having levels of infection that are considered to induce significant production losses (>3 UTyr). The level of nematode control was high in each country, which is illustrated by the widespread use of anthelmintics (69-83% of herds) and the frequent combination of anthelmintic use and control through pasture management (>50% of herds combined two or more protective measures). However, the used control methods showed clear differences between the countries. After taking into account the effect of anthelmintic treatment, herd mean pepsinogen levels were significantly lower in large herds, in calves grazing on a small paddock (vs. pasture) and on mown (vs. non-mown) pastures and if turn out on pasture was postponed. The collected data may serve as a baseline from which we can monitor the methods and success of gastrointestinal nematode control in dairy cattle.
本研究的目的是确定三个欧洲国家（比利时、德国和瑞典）首季放牧犊牛中寄生 O. ostertagi 的流行水平及其相关管理因素。在连续两年中，对首季放牧奶牛进行了横断面调查。2006 年和 2007 年放牧期末，通过标准化血清胃蛋白酶原检测评估 O. ostertagi 的感染水平，并通过问卷调查同时收集针对胃肠道线虫的控制措施信息。2006 年共收集了 358 个畜群的信息，2007 年收集了 726 个畜群的信息。不同国家的总体感染模式相似，大多数畜群的胃蛋白酶原结果较低（<1 UTyr）或中等（1-3 UTyr），只有 2-6%的畜群感染水平被认为会导致显著的生产损失（>3 UTyr）。每个国家的线虫控制水平都很高，这反映在驱虫剂的广泛使用（69-83%的畜群）以及驱虫剂使用与牧场管理相结合的频繁控制（>50%的畜群联合使用两种或更多保护措施）。然而，所使用的控制方法在国家之间存在明显差异。在考虑驱虫处理的效果后，大畜群、在小围场（与牧场相比）放牧的犊牛、在修剪（与未修剪相比）牧场上放牧以及推迟牧场放牧的畜群平均胃蛋白酶原水平显著降低。收集的数据可以作为基线，从中可以监测奶牛胃肠道线虫控制的方法和效果。
