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An extensive number of investigations on the energetic utilization efficiency of nutrientsand feedstuffs by cattle were carried out in the former Oskar-Kellner-Institute (now the»Oskar Kellner« Research Unit of Nutritional Physiology at the Research Institute for theBiology of Farm Animals (FBN), Dummerstorf). The amounts of methane (CH4) that theyproduced were compiled and stratified with regard to various performances, dietarynutrient composition and nutrition levels. With increasing food intake and performance,an increase of CH4 emission per animal was observed. However, with increasingperformance, a strong decrease of CH4 production per unit of product was determined.Altogether, the 12.74 million cattle in Germany produce 1.04 million tons of CH4 per year.This represents 1.25 % of the CH4 production of the 1.3 thousand million (UK)/billion (US)cattle in the world or 0.22 % of the total emission on the earth. As a greenhouse gas, CH4from cattle worldwide and from cattle in Germany account for 3.5 % and 0.04 % of globalwarming, respectively. In addition, opportunities for a further reduction of enteric CH4release are discussed

Quantitative results for methane production of cattle in Germany