1. Ankom (2006a) Acid detergent fiber in feeds filter bag technique. Ankom Technology, Macedon, p 2
2. Ankom (2006b) Neutral detergent fiber in feeds filter bag technique. Ankom Technology, Macedon, p 2
3. AOAC (1990) Official methods of analysis: 1st supplement. J Assoc Offic Anal Chem 15:3–4
4. Davies DA, Fothergill M, Jones D (1991) Assessment of contrasting perennial ryegrasses, with and without white clover, under continuous sheep stocking in the uplands. 3. Herbage production, quality and intake. Grass Forage Sci 46:39–49
5. Dent JW, Aldrich DTA (1968) Systematic testing of quality in grass varieties. Grass Forage Sci 23:13–19