Large Animal Clinic, Veterinary Academy, Lithuanian University of Health Sciences, Tilžės str 18, Kaunas LT44307, Lithuania.
Department of Animal Breeding, Veterinary Academy, Lithuanian University of Health Sciences, Tilžės str 18, Kaunas LT44307, Lithuania.
Sensors (Basel). 2020 Feb 14;20(4):1022. doi: 10.3390/s20041022.
Our study hypothesis is that the interline registered pH of the cow reticulum can be used as an indicator of health and reproductive status. The main objective of this study was to examine the relationship of pH, using the indicators of the automatic milking system (AMS), with some parameters of cow blood components. The following four main groups were used to classify cow health status: 15-30 d postpartum, 1-34 d after insemination, 35 d after insemination (not pregnant), and 35 d (pregnant). Using the reticulum pH assay, the animals were categorized as pH < 6.22 (5.3% of cows), pH 6.22-6.42 (42.1% of cows), pH 2.6-6.62 (21.1% of cows), and pH > 6.62 (10.5% of cows). Using milking robots, milk yield, fat protein, lactose level, somatic cell count, and electron conductivity were registered. Other parameters assessed included the temperature and pH of the contents of reticulorumens. Assessment of the aforementioned parameters was done using specific smaX-tec boluses. Blood gas parameters were assessed using a blood gas analyzer (EPOC (Siemens Healthcare GmbH, Erlangen, Germany). The study findings indicated that pregnant cows have a higher pH during insemination than that of non-pregnant ones. It was also noted that cows with a low fat/protein ratio, lactose level, and high SCC had low reticulorumen pH. They also had the lowest blood pH. It was also noted that, with the increase of reticulorumen pH, there was an increased level of blood potassium, a high hematocrit, and low sodium and carbon dioxide saturation.
我们的研究假设是牛网胃的行间 pH 值可以作为健康和繁殖状况的指标。本研究的主要目的是检查 pH 值与自动挤奶系统（AMS）指标的关系，以及与一些奶牛血液成分参数的关系。本研究使用以下四个主要组来对奶牛的健康状况进行分类：产后 15-30 天、授精后 1-34 天、授精后 35 天（未怀孕）和 35 天（怀孕）。使用网胃 pH 值测定法，将动物分为 pH 值<6.22（5.3%的奶牛）、pH 值 6.22-6.42（42.1%的奶牛）、pH 值 2.6-6.62（21.1%的奶牛）和 pH 值>6.62（10.5%的奶牛）。使用挤奶机器人记录产奶量、脂肪蛋白、乳糖水平、体细胞计数和电子电导率。其他评估的参数包括网胃内容物的温度和 pH 值。使用特定的 smaX-tec 测压胶囊来评估上述参数。使用血气分析仪（EPOC（西门子医疗有限公司，德国埃朗根）评估血气参数。研究结果表明，授精期间怀孕奶牛的 pH 值高于未怀孕奶牛。还注意到，脂肪/蛋白质比、乳糖水平和高 SCC 低的奶牛的网胃 pH 值较低。它们的血液 pH 值也最低。还注意到，随着网胃 pH 值的升高，血液钾水平升高、血细胞比容升高、而钠离子和二氧化碳饱和度降低。
