Thomas C V, DeLorenzo M A
Dairy Science Department, University of Florida, Gainesville 32611.
J Dairy Sci. 1994 May;77(5):1285-95. doi: 10.3168/jds.S0022-0302(94)77068-5.
A method of simulating individual cow milk yield per milking as a function of herd milk yield and month was formulated for milking parlor simulation models. Milk yield per milking was modeled for each month in three herd milk yield categories: 8165, 8845, and 9525 kg/yr of milk per cow. Actual individual cow DHIA test day milk weight data for three Florida dairy herds in each herd milk yield category and month were adjusted to the mean of their respective actual milk shipped per cow on test day then pooled and converted to a basis of three times per day milk yield per milking. After minor truncation, Weibull probability distributions fitted to these data sets adequately modeled milk yield per milking per cow. Analysis of simulation results for milk yield per milking per cow indicated no significant differences between actual and simulated means for any herd milk yield category or month. Simulations of monthly and yearly total herd milk yield for each herd indicated that fitted Weibull distributions also adequately modeled monthly and yearly herd milk yield characteristics and reflected seasonal herd milk yield patterns typical of Florida.
针对挤奶厅模拟模型，制定了一种将每次挤奶的个体奶牛产奶量模拟为牛群产奶量和月份函数的方法。对三个牛群产奶量类别（每头奶牛每年产奶8165、8845和9525千克）中每个月的每次挤奶产奶量进行建模。对每个牛群产奶量类别和月份中三个佛罗里达奶牛群的实际个体奶牛DHIA检测日牛奶重量数据进行调整，使其与各自在检测日每头奶牛实际运输的牛奶均值一致，然后汇总并转换为每天挤奶三次的产奶量基准。经过轻微截断后，拟合这些数据集的威布尔概率分布能够充分模拟每头奶牛每次挤奶的产奶量。对每头奶牛每次挤奶产奶量的模拟结果分析表明，对于任何牛群产奶量类别或月份，实际均值与模拟均值之间均无显著差异。对每个牛群的月度和年度牛群总产奶量进行模拟表明，拟合的威布尔分布也能充分模拟月度和年度牛群产奶量特征，并反映出佛罗里达典型的季节性牛群产奶模式。
