1. Energy and Protein Requirements of Ruminants;Agricultural and Food Research Council,1993
2. Anon, 1990. Report from the Langhill Research Centre, Midlothian, Scotland.
3. Anon, 1991. Report from the Langhill Research Centre, Midlothian, Scotland.
4. Anon, 1992. Report from the Langhill Research Centre, Midlothian, Scotland.
5. Anon, 1993. Report from the Langhill Research Centre, Midlothian, Scotland.