In a field survey of the Swiss College for Agriculture and a complementary trial at the Swiss Federal Research Station for Animal Production (RAP), the mineral content of grass from continuous short grass pastures and rotational pastures was analyzed. The order of magnitude of the mineral content of investigated continuous short grass pastures and rotational pastures generally corresponds to tabulated values for Swiss herbage (RAP, 1994). There exist only minor differences between feed samples from continuous short grass pastures and rotational pastures. The early regrowths tend to contain less calcium and magnesium than later regrowths. On the other hand, phosphorous content slightly decreases from earlier to later regrowths. These findings are valid for both grazing systems. Compared to the trace element feeding recommendations for dairy cows, herbage from continuous short grass pastures and rotational pastures is short of Cu, Zn and Se but rich in Mn.
Pontiggia A., Münger A., Ammer S., Philipona C., Bruckmaier R. M., Keil N.M., Dohme-Meier F.
Even in temperate climate zones, an increase in the ambient temperature and solar radiation can cause heat stress in grazing dairy cows. Agroscope studied the physiological changes in cows caused by increasing heat load.
Lazzari G., Münger A., Heimo D., Seifert S., Camarinha-Silva A., Borda-Molina D., Zähner M., Schrade S., Kreuzer M., Dohme-Meier F.
In dairy cows, herbage-based diets often lead to increased nitrogen excretion. Tanniferous sainfoin and extract of acacia can reduce nitrogen excretion from urine and thus ammonia volatilization from slurry.
Excessive nitrogen inputs from the air lead to over-fertilisation of sensitive ecosystems. Continuous feeding optimisation can make an important contribution to reducing ammonia losses and thus nitrogen inputs.