Cointegration analysis used in a study of dairy-cow mortality

被引:29
作者
Norgaard, NH
Lind, KM
Agger, JF
机构
[1] Danish Inst Agr & Fisheries Econ, DK-2500 Copenhagen, Denmark
[2] Royal Vet & Agr Univ, Dept Anim Sci & Anim Hlth, DK-1870 Frederiksberg C, Denmark
关键词
cattle mortality; cointegration; time series analysis; economics;
D O I
10.1016/S0167-5877(99)00068-9
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
A competitive environment forces the farmer constantly to adopt new and more-intensive production methods aiming at lowering costs and increasing yields. At debate is whether this intensification of production has an adverse impact on animal health and welfare. We investigated this issue by using cointegration analysis (a new tool used in time series analysis). We introduce cointegration analysis by applying the method in an epidemiological study of dairy-cow mortality Two long-run epidemiological relations are identified: (i) a physiological relation (where increasing consumption of concentrates corresponded to increasing milk yield and mortality) and (ii) a physical relation (which illustrated that higher mortality was closely related to a higher growth rate of the average herd size, current investments in dairy farming, and higher milk yield). We concluded that a higher level of physiological stress due to higher yield and concentrate consumption has led to increased mortality. Furthermore, changes in the physical environment due to increased mechanisation and larger herd sizes have contributed to less attention per cow and increased mortality. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:99 / 119
页数:21
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