The amino acid (AA) contents of 42 forages were analysed. During three consecutive years, forage samples from the first and third cut were collected at two stages of maturity (30 days apart) on the same experimental plots. After cutting, the forage samples were either frozen (-20°C), artificially dried (forced air at 30°C, <45% relative humidity), wilted on the field and subsequently barn dried, field dried, ensiled with a dry matter (DM) content of 30% or ensiled with a DM content of 50%. The method of conservation had no effect on total AA content in DM. However, when considered individually, the contents of certain AA showed significant differences among methods of conservation, particularly between ensiling at 30% DM and the remaining methods of conservation. In silages, a high moisture content associated with an insufficiently low pH, resulted in a pronounced degradation of proteins and modification of the AA profile. Compared to the other conservation methods, ensiling increased the proportion of proline and decreased the proportions of glutamic acid and aspartic acid. Any of the conservation methods could prevent losses of AA. Freezing resulted in the smallest losses, but this conservation method can only be applied in research. For application in practice, careful drying methods proved to be the least damaging.
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.
A study by Vetsuisse shows that the outdoor veal calf concept reduces antibiotic consumption in calf fattening by 80%. AGRIDEA has examined the economic viability of outdoor veal calf production and concludes that it cannot compete with conventional veal calf fattening.
In contrast to pigs, dairy cattle are as yet rarely fed protein-reduced diets. Studies show that there is also potential for protein savings in cattle, and thus for reducing ammonia emissions.