Short communication: Comparison of protocols to estimate twenty-four-hour fat and protein percentages for herds with a robotic milking system.
Short communication: Comparison of protocols to estimate twenty-four-hour fat and protein percentages for herds with a robotic milking system.
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简短的交流：使用机器人挤奶系统估算牛群二十四小时脂肪和蛋白质百分比的协议比较。
DOI：
10.3168/jds.s0022-0302(06)72240-8
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发表时间：
2006
影响因子：
3.5
通讯作者：
D. Kelton
中科院分区：
文献类型：
--
作者：
K. Hand;D. Lazenby;F. Miglior;D. Kelton
目前，不同的国家使用不同的方案来估计用自动挤奶系统挤奶的奶牛的24小时脂肪和蛋白质百分比。这些方案包括从1)畜群中所有动物的单个样本中估计24小时脂肪和蛋白质百分比；2)经协变量调整的单个脂肪样本和未经协变量调整的单个蛋白质样本；或3)在测试日收集的所有样本（调整后的和未调整的），测试日的长度从10到18小时不等。通过对四个方案的一致性分析，确定了预测观察到的百分比的估计成分百分比的准确性。数据分析表明，在测试日至少16小时的采样期间收集所有样本（未经协变量调整）是在自动挤奶系统中估计24小时脂肪和蛋白质百分比时最准确的方案。
Currently, different protocols are used in various countries to estimate the 24-h fat and protein percentages for dairy cows that are milked with an automatic milking system. These protocols include estimating 24-h fat and protein percentages from 1) single samples from all animals in the herd; 2) single samples of fat adjusted for covariates and single samples of protein unadjusted for covariates; or 3) all samples (adjusted and unadjusted) collected on test days where test days vary in length from 10 to 18 h. The accuracy of estimated component percentages in predicting observed percentages was determined via agreement analysis for four protocols. Analysis of the data suggests collecting all samples (unadjusted for covariates) during a sampling period of at least 16 h on test day to be the most accurate protocol when estimating 24-h fat and protein percentages in herds with automatic milking systems.