weight control chart

Excel spreadsheets templates in "empiric.xls" are from the Quality Digest website at www.qualitydigest.com/pdfs/empiric.xls (Levinson and Tumbelty, 1997). Data in "weight.xlsx" are BW measurements of 2, 9, and 14.5-month-old sampled heifers born during the years 2017 to 2019 provided by a commercial dairy farm in Córdoba province. These data were used to build control charts to monitor mean and process variability. Every sample mean or deviation outside the control limits imply a potentially identifiable cause has occurred and the producer should explore the event causing the deviation and make appropriate changes according to the age of the heifers. Control charts provide the producer and consultant with graphical information and quick alarms to support the decision-making process in the replacement program. These tools are useful at the farm level to monitor heifer growth and support management decisions.本数据集内"empiric.xls"所含的Excel电子表格模板，源自Quality Digest网站（网址：www.qualitydigest.com/pdfs/empiric.xls），相关材料作者为Levinson与Tumbelty，发表于1997年。"weight.xlsx"中的数据为科尔多瓦省某商业奶牛场提供的、2017至2019年间出生的2月龄、9月龄及14.5月龄抽样青年母牛（heifer）的体体重（Body Weight, BW）测量值。该批数据被用于构建控制图（control charts），以监测均值与过程变异程度。若样本均值或偏差超出控制限，则表明存在可识别的潜在异常诱因，养殖者需针对该偏差事件展开排查，并根据青年母牛的日龄做出适配性调整。控制图可为养殖者与技术顾问提供可视化信息与快速告警功能，助力后备母牛替换计划中的决策流程。此类工具可在牧场层面有效监测青年母牛生长情况，并辅助养殖管理决策。