1. Berg RT, Butterfield RM (1976) New concepts of cattle growth. Univ Press, Sydney
2. Block RJ, Mitchell HH (1946) The correlation of the amino acid composition of proteins with their nutritive value. Nutr Abstr Rev 16: 249–278
3. Klain CJ, Greene DE, Scott HM, Johnson BC (1960) The protein requirement of the growing chick determined with amino acid mixtures. J Nutr 71: 209–212
4. McDonald P, Edwards RA, Greenhalgh JFD (1973) Animal nutrition, 2nd edn. Longman, New York
5. Moon P, Spencer DE (1974) A geometry of nutrition. J Nutr 104: 1535–1542