Invloed van eiwitgehalte in rantsoen op duurzaamheidsindicatoren in de melkveehouderij : Analyse KringloopWijzer data 2020 en 2021 voor de projecten Koe & Eiwit en Home Made Eiwit

Samenvatting

This study investigated the relationship between and explaining variables for indicators, related to ammonia emission, protein feeding and home grown protein, as determined by the Annual Nutrient Cycling Assessment tool for the dairy sector. Furthermore, possible effects on other sustainability indicators, like greenhouse gas emissions, were assessed. The results show relations between variables as determined on the whole set of farms and given the calculation rules of the tool. The crude protein (CP) content of protein rich diet components, i.e., grass products and concentrates, and the shares of other diet components, i.e., maize, other roughages and co-products, are the most important explaining variables for the CP content of the ration. For explaining the ammonia emission per ha, after intensity, the CP content of the diet is an important variable. Next to this variable, emission reduction percentage of the dairy barn, fertilization level and herd composition are important factors. When both are expressed per kg milk, greenhouse gas and ammonia emissions are slightly positively correlated, meaning that a simultaneous good score on both indicators is possible. Also in the explanation of the variation in home grown protein in the ration, intensity plays an important role, next to the CP content of the different diet components and their shares in the diet.