Monitoring dairy heifer growth through control charts

Animal - Open Space Pub Date : 2022-12-01 DOI:10.1016/j.anopes.2022.100028

C. Vissio , M.F. Torres , S. Chesniuk , M.P. Turiello

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Abstract

The efficiency of replacement programmes in dairy farms depends largely on the heifers’ growth rate. We provide a case study of control chart application to monitor the weight of dairy replacement heifers. A research dairy farm in Córdoba province, Argentina, provided the monthly samples of BW measurements of 2, 9, and 14.5-month-old heifers born between 2017 and 2019. The data were used to build control charts for the mean and for SD, with moving range control limits in order to consider varying sample sizes. In each age group, control charts for the mean showed at least one out-of-control sample, whereas control charts for SD showed one sample out of control for 9-month-old heifers. Each sample outside the control limits implies that a potentially identifiable cause has occurred. Therefore, the producer could identify the event causing the deviation and make the necessary changes according to the heifer’s age. Control charts provide the producer and consultant with graphical information and quick alerts to support the decision-making process of the replacement programme. These tools are useful at the farm level to monitor heifer weights and support management decisions.

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通过控制图监测奶牛的生长情况

奶牛场替代计划的效率在很大程度上取决于小母牛的生长速度。我们提供了一个应用控制图监测替代奶牛体重的案例研究。阿根廷Córdoba省的一个研究性奶牛场提供了2017年至2019年出生的2个月、9个月和14.5个月大的小母牛的体重测量样本。这些数据被用来建立均值和标准差的控制图，为了考虑不同的样本量，控制图具有移动范围控制限制。在每个年龄组中，平均值的控制图显示至少有一个失控样本，而标准差的控制图显示9个月大的小母牛有一个失控样本。每个超出控制范围的样品都意味着发生了一个潜在的可识别的原因。因此，生产者可以识别导致偏差的事件，并根据小母牛的年龄做出必要的改变。控制图为生产者和顾问提供图形信息和快速警报，以支持更换方案的决策过程。这些工具在农场一级监测小母牛体重和支持管理决策方面非常有用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Animal - Open Space

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