1. Anonymous, 1978. Pages 9–15 in Poultry Research Centre Report for the year ended 31st March 1978. Agric. Res. Counc, King's Bldg., West Mains Road, Edinburgh, Scotland.
2. On the routine determination of chromic oxide in feces;Brisson;Can. J. Anim. Sci.,1957
3. Rapid determination of metabolizable energy of foods using cockerels;Farrell;Br. Poultry Sci.,1978
4. Preliminary study of the determination of the apparent digestibility of protein by modified procedures;Gallup;J. Agric. Res.,1931
5. Studies of the metabolizable energy of grain and grain products for chickens;Hill;Poultry Sci.,1960