This study explores the relationships between composition, hygienic quality, and color values of milk to evaluate whether colorimetry could be used as a valid predictor of the quality of raw milk and its coagulation. For this purpose, we performed analyses in 1,200 individual samples of Manchega sheep milk from 4 flocks from the region of Castilla-La Mancha, Spain. Based on the measured variables, we determined the differences and similarities between coagulating and noncoagulating samples using discriminant analysis techniques. The variables with a higher discriminant ability were lactose content, somatic cell score, pH, and the color values lightness (L*) and red/green value (a*). The model based on color values showed a predictive ability similar to that found in the model based on milk composition and hygienic quality. Canonical correlation analysis allowed us to explore the relationships between both sets of variables. Canonical correlations for the first and second pair of canonical values were 0.794 and 0.438, respectively. Both values were significant and represented 92.82% of the observed variability. The correlation structure showed that color values had a strong correlation with fat and protein content and with total solids, and they had a weak correlation with lactose content and somatic cell score. The 2 first combinations of standardized canonical variability could be considered a predictable measure of the composition and, to a lesser extent, the hygiene of milk. Measurement of color values could be a rapid and effective means of supplementing standard analyses when determining the coagulation ability of Manchega sheep milk.

中文翻译：

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使用多变量分析来探索颜色，成分，卫生质量和曼切加羊乳凝结之间的关系。

这项研究探索了牛奶的成分，卫生质量和颜色值之间的关系，以评估比色法是否可以用作生乳及其凝结质量的有效预测指标。为此，我们对来自西班牙卡斯蒂利亚-拉曼恰地区的4个鸡群的1200个曼切加羊奶样品进行了分析。基于测量的变量，我们使用判别分析技术确定了凝结样品和非凝结样品之间的差异和相似性。具有较高判别能力的变量是乳糖含量，体细胞评分，pH值和颜色值明度（L *）和红色/绿色值（a *）。基于颜色值的模型显示出与基于牛奶成分和卫生质量的模型相似的预测能力。典型的相关分析使我们能够探索两组变量之间的关系。第一对和第二对规范值的典范相关分别为0.794和0.438。这两个值均显着，代表观察到的变异性的92.82％。相关结构表明，颜色值与脂肪和蛋白质含量以及总固体含量有很强的相关性，与乳糖含量和体细胞分数的相关性很弱。标准化规范变异性的前两种组合可以认为是对成分的可预测性度量，在较小程度上可以认为是牛奶的卫生性。当确定曼切加羊奶的凝结能力时，颜色值的测量可能是补充标准分析的快速而有效的手段。