The efficacy of 0.2 % formic acid, 0.3% and 0.6% propionic acid and 0.05 % H2O2 against yeast growth in whey was tested in the laboratory. After inoculation with cultures of naturally contaminated whey and the addition of the preservatives the whey samples were incubated during four days. Gas pressure was measured continuously. Yeast numbers were counted once a day. The samples containing formic acid had the lowest yeast count and the smallest fluctuations in pressure (P < 0.05). Thus formic acid proved to be the most efficient whey preservative. H2O2 suppressed yeasts more efficiently than did propionic acid during the first two days but had no lasting effect, presumably because H2O2 had been used up. Although the yeast count was not reduced in the samples containing propionic acid gas pressure frequently decreased below 0, indicating that gas was used by microbes. Simple on farm tests, which measure gas formation semiquantitatively as an indicator for the presence of yeasts may therefore yield false negative results when propionic acid is used as a preservative.
Although milk-production oriented (MPO) cow breeds have also become established in the mountain region, farms with the dual-purpose ‘Original Simmental’ breed are proving to be economically viable, with lower costs and higher direct payments making up for lower revenues from milk.
High milk yields before drying-off increase the risk of udder infections during the dry period. An online survey highlights what drying-off methods are currently used and how farmers rate the ‘incomplete milking’ approach for reducing milk yield.
Herholz C., Siegwart J., Bruckmaier R.M., Rytz E., Lamon I., Muhr M. und Stirnimann R.
In both sport and alternative agriculture, horses are once again being used as draught animals. Efficient power transmission plays an important role in the wellbeing of draught horses.