1. Official Methods of Analysis,1980
2. Measurement of feed intake by grazing cattle and sheep;Christian;VI. The determination of chromic oxide in faeces. NZ. J. Dairy Sci. Technol.,1954
3. Threonine imbalance and the threonine requirement of the chicken;Davis;J. Nutr.,1982
4. Davis, A. J., and R. E. Austic, 1993. Increased hepatic threonine dehydrogenase (TDH) activity in chicks and rats subjected to dietary threonine (THR) imbalance. FASEB J. 7:A392.(Abstr.)
5. Multiple range and multiple F tests;Duncan;Biometrics,1955