Bünemann Katharina, Johannes Maren, Schmitz Rolf, Hartwiger Julia, Soosten Dirk von, Hüther Liane, Meyer Ulrich, Westendarp Heiner, Hummel Jürgen, Zeyner Annette, Dänicke Sven
Institute of Animal Nutrition, Friedrich-Loeffler-Institut (FLI), Federal Research Institute for Animal Health, 38116 Braunschweig, Germany.
Faculty of Agricultural Sciences and Landscape Architecture, University of Applied Sciences, 49076 Osnabrück, Germany.
Animals (Basel). 2020 Feb 8;10(2):267. doi: 10.3390/ani10020267.
The aim of the study was to examine different pH parameters, such as variations throughout the day, depending on differing concentrate feed proportions. Moreover, special attention was payed to individual variation in microbial efficiencies (microbial crude protein/fermented organic matter) and their relation to ruminal pH, nutrient flows and digestibilities. For this, cows were grouped according to microbial efficiency (more, n = 5, vs. less efficient cows, n = 4). After calving, thirteen ruminally cannulated pluriparous cows, including nine duodenally cannulated animals, were divided into groups offered rations with a lower (35% on dry matter basis, n = 7) or a higher (60% on dry matter basis, n = 6) concentrate feed proportion. Ruminal pH parameters were assessed continuously by using intraruminal probes. Nutrient flows, nutrient digestibility and microbial efficiency were determined for duodenally cannulated cows. For most ruminal pH parameters it seemed that individual variability was higher than the treatment effect. However, a positive relationship between actual concentrate intake and diurnal pH fluctuations was found. Besides, the effect of individually different microbial efficiencies was assessed. Again, there were no group differences for pH parameters. However, nutrient flows were significantly higher in more efficient cows, whereas digestibilities were lower in in more efficient cows.
本研究的目的是研究不同的pH参数，例如取决于不同精饲料比例的全天变化情况。此外，还特别关注微生物效率（微生物粗蛋白/发酵有机物）的个体差异及其与瘤胃pH值、养分流量和消化率的关系。为此，根据微生物效率将奶牛分为两组（高效组，n = 5；低效组，n = 4）。产犊后，13头装有瘤胃瘘管的经产奶牛，包括9头装有十二指肠瘘管的奶牛，被分为两组，分别饲喂精饲料比例较低（干物质基础上为35%，n = 7）或较高（干物质基础上为60%，n = 6）的日粮。通过瘤胃内探头连续评估瘤胃pH参数。对装有十二指肠瘘管的奶牛测定养分流量、养分消化率和微生物效率。对于大多数瘤胃pH参数而言，个体变异性似乎高于处理效应。然而，发现实际精饲料摄入量与昼夜pH波动之间存在正相关关系。此外，评估了个体不同微生物效率的影响。同样，pH参数在两组之间没有差异。然而，高效奶牛的养分流量显著更高，而高效奶牛的消化率更低。
