In the framework of the current revision of the Swiss Fertilizer Guidelines (SFG) the guide values for nutrient excretion of pigs were checked and adapted to current production practice. The principle used for calculating excretions is input in feed minus retention in in the growth of piglets and young sows. For fattening pigs all the relevant information on current production practice could be derived from representative farm data. For sows, in addition to analysed farm data information was derived from the current feeding recommendations. For the feed content, the mean values for normal feed without reduced protein and phosphorous content from a representative survey was used for all animal categories. For fattening pigs the nitrogen (N) and phosphorus (P) excretions which are important for the compulsory nutrient balance of farms remained practically the same as according to the previous guide values. This was possible because the increased productivity per place per year was counterbalanced by a better feed conversion efficiency and a reduction of the protein and P content of the feed. For sows excretions increase quite considerably because of the higher productivity (piglets per sow per year, shorter suckling period etc.) and changes in the feeding recommendations.
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.