van der Voort M, Van Meensel J, Lauwers L, de Haan M H A, Evers A G, Van Huylenbroeck G, Charlier J
Business Economics Group, Wageningen University & Research, Hollandseweg 1, 6706KN Wageningen, The Netherlands.
Social Sciences Unit, Institute for Agricultural and Fisheries Research (ILVO), Burg. Van Gansberghelaan 115, 9820 Merelbeke, Belgium.
Vet Parasitol. 2017 Mar 15;236:68-75. doi: 10.1016/j.vetpar.2017.02.004. Epub 2017 Feb 11.
Grazing management (GM) interventions, such as reducing the grazing time or mowing pasture before grazing, have been proposed to limit the exposure to gastrointestinal (GI) nematode infections in grazed livestock. However, the farm-level economic effects of these interventions have not yet been assessed. In this paper, the economic effects of three GM interventions in adult dairy cattle were modelled for a set of Flemish farms: later turnout on pasture (GM1), earlier housing near the end of the grazing season (GM2), and reducing the daily grazing time (GM3). Farm accountancy data were linked to Ostertagia ostertagi bulk tank milk ELISA results and GM data for 137 farms. The economic effects of the GM interventions were investigated through a combination of efficiency analysis and a whole-farm simulation model. Modelling of GM1, GM2 and GM3 resulted in a marginal economic effect of € 8.36, € -9.05 and € -53.37 per cow per year, respectively. The results suggest that the dairy farms can improve their economic performance by postponing the turnout date, but that advancing the housing date or reducing daily grazing time mostly leads to a lower net economic farm performance. Overall, the GM interventions resulted in a higher technical efficiency and milk production but these benefits were offset by increased feed costs as a result of higher maintenance and cultivation costs. Because the results differed highly between farms, GM interventions need to be evaluated at the individual level for appropriate decision support.
放牧管理（GM）干预措施，如缩短放牧时间或在放牧前对牧场进行割草，已被提议用于限制放牧家畜感染胃肠道（GI）线虫。然而，这些干预措施对农场层面的经济影响尚未得到评估。在本文中，针对一组佛兰德农场模拟了三种GM干预措施对成年奶牛的经济影响：推迟在牧场放牧的时间（GM1）、在放牧季节接近尾声时提前圈舍饲养（GM2）以及减少每日放牧时间（GM3）。将农场会计数据与137个农场的奥斯特他线虫群体罐奶ELISA结果及GM数据相关联。通过效率分析和全农场模拟模型相结合的方式研究了GM干预措施的经济影响。对GM1、GM2和GM3的模拟结果分别为每头奶牛每年带来8.36欧元、-9.05欧元和-53.37欧元的边际经济影响。结果表明，奶牛场可以通过推迟放牧日期来提高其经济表现，但提前圈舍饲养日期或减少每日放牧时间大多会导致农场净经济表现降低。总体而言，GM干预措施提高了技术效率和牛奶产量，但由于维护和养殖成本增加导致饲料成本上升，抵消了这些益处。由于各农场之间的结果差异很大，需要在个体层面评估GM干预措施，以提供适当的决策支持。
