As most European countries, Switzerland has signed the Gothenburg Protocol to abate acidification, eutrophication and ground-level ozone. The protocol puts pressure on Swiss livestock producers to implement measures to reduce their ammonia emissions. Dietary modifications (optimization of crude protein concentration) will affect, as a begin-of-pipe measure, all emission stages from barn to field. The aim of the present study was to gain an overview of the current pig-feeding practices in Switzerland. A survey was conducted based on data from manufactures, comprising 70-80 % of the Swiss pig-feed market. The declared crude protein values comply with analyzed values. The survey showed that, depending on the feed category, 70-75 % of the feed is sold with reduced nitrogen (crude protein) and phosphorus concentrations (NPr feed). Based on an energy concentration of 13,5 MJ DE, the average CP concentrations for fattening pigs are 172,3 g CP/kg for standard and 155,5 g CP/kg for NPr diets. Finisher diets only have a marginal CP reduction compared to fattening diets. The difference in CP concentrations between standard and NPr feed is much smaller for piglet and sow diets compared to fattening diets. 25 – 30 % of pig feed is not sold as NPr diets. In addition, part of the diets for finishing pigs and gestating sows are overformulated regarding CP. Adaptations in theseareas offer potential for reducing ammonia emissions.
Which stakeholders in the dairy sector have an influence on the productive life of dairy cows? Research results from FiBL and Agroscope suggest that broad-based cooperation is needed to create structures for a longer productive life.
Agriculture is aiming to reduce greenhouse gas and ammonia emissions. Agroscope showed that for dairy cattle housing, feed composition plays a role in these emissions as well as wind and temperature.
Lazzari G., Münger A., Eggerschwiler L., Borda-Molina D., Seifert J., Camarinha-Silva A., Schrade S., Zähner M., Zeyer K., Kreuzer M., Dohme-Meier F.
Tannin-containing feedstuffs like Acacia mearnsii and sainfoin (Onobrychis viciifolia) have a measurable impact in reducing methane emissions from dairy cows. However, since these feedstuffs in some cases lead to productivity losses, careful consideration must be given to their use.