1. AOAC (1984) AOAC official method 7.074 fiber (acid detergent) and lignin in animal feed. In: Williams S (ed) Official methods of analysis of AOAC, 14th edn. Assoc. of Off. Anal. Chemists, Arlington, pp 162–163
2. Beauchemin K (1991) Effects of dietary neutral detergent fiber concentration and alfalfa hay quality on chewing, rumen function, and milk production of dairy cows. J Dairy Sci 74:3140–3151
3. Bertilsson J, Murphy M (2003) Effects of feeding clover silages on feed intake, milk production and digestion in dairy cows. Grass Forage Sci 58:309–322. doi: 10.1046/j.1365-2494.2003.00383.x
4. Byström S, Jonsson S, Martinsson K (2002) Organic versus conventional dairy farming—studies from the Öjebyn project. The UK Organic Research Conference, Aberystwyth, pp 179–184
5. Counc. of the Eur. Union (2007) Council Regulation (EC) No. 834/2007 of 28 June 2007 on organic production and labelling of organic products and repealing Regulation (EEC) No 2092/91. Off J Eur Communities 189:1–23