1. Technical committee on responses to nutrients: Report 6. A reappraisal of the calcium and phosphorus requirements of sheep and cattle;AFRC (Agricultural and Food Research Council);Nutr. Abstr. Rev.,1991
2. The Nutrient Requirements of Ruminant Livestock;ARC (Agricultural Research Council),1980
3. Sodium and Potassium in Nutrition of Mammals;Aitken,1976
4. Calcium bioavailability and absorption: A review;Allen;Am. J. Clin. Nutr.,1982
5. Official Methods of Analysis;AOAC International,2000