1. Alexandratos N, Brunsma J (2012) World agriculture towards 2030/2050: the 2012 revision. ESA Working paper No. 12–03. Food and Agriculture Organization of the United Nations, Rome, Italy
2. Beauchemin KA, Kreuzer M, O’Mara F, McAllister TA (2008a) Nutritional management for enteric methane abatement: a review. Aus J Exp Agric 48:21–27
3. Beauchemin KA, McGinn SM, Grainger C (2008b) Reducing methane emissions from dairy cows. Adv Dairy Tech 20:79–93
4. Beyer M et al (2003) Rostock feed evaluation system: reference numbers of feed value and requirement on the base of net energy, pp. 294–351
5. Caro D, Davis SJ, Bastianoni S, Caldeira K (2014a) Global and regional trends in greenhouse gas emissions from livestock. Clim Chang 126:203–216