Parameters used in the simulations.
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资源简介：
indicates that the life span of animals on a farm is assumed to be 5 years and indicates that the natural life span of cattle is about 20 years. In a diary farm setting, farmers tend to keep cattle for 4 to 5 years when they are highly productive, and replace them when they age and become less productive.
创建时间：
2015-12-02
